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Black_Moons
03-24-2011, 03:27 AM
A true 100MPG ride, Made in canada (More or less), For $715.

So far the cost has been:
Motor: $160
Bike: $25 at thrift store
Shift kit: $200
Carb: $50
Exhaust: $60
Misc parts/Material: $50
Paint: $30
Misc Bike upgrade parts: $140, Mainly spent on a heavy duty back wheel and 'Megarange' 7 speed sprocket, And new high quality chain, New brake pads and cables.

Time: Priceless. For everything else. There is cash.
Total Cost: $715

Savings: Lots. As I don't have to pay insurance. 50cc motor. Top speed 60kph~, till I tune it a little better and push it a little harder. Very good acceleration, And goes up even the steepest of hills without bogging down, (I live near a 30 degree hill or so and going up it is a joy done around 20kph, And the hill starts RIGHT after an intersection where the light is always red, So there's only about 20' to accelerate for a running start)

And overall, Its fun as hell to ride. I take side roads, mainly ride on the sidewalk as nobody actualy walks on it around here, Except in parking lots where I actualy go on the road. Sometimes I cruse at low speed. Other times accelerate at top speed and slam on the brakes just before the intersection. Everythings an obstical coarse. You just can't do that on the road. Not nearly as fun to ride on the road.


http://i.imgur.com/zXSxhl.jpg
Larger version (http://imgur.com/zXSxh.jpg)

http://i.imgur.com/LWepjl.jpg
Larger version (http://imgur.com/LWepj.jpg)



Close up Picture of custom exhaust header I made, and bent with my torch after filling the sand with pipe. Also shown is the front mounting bracket I made, Extra large to distribute the force and lined with a precise fitted pipe to prevent crimping the tube.

http://i.imgur.com/k9DD7l.jpg
Larger version (http://imgur.com/k9DD7.jpg)

Photo of gas tank after being re-brazed, After it cracked. Turned the fillet braze from about 1/8" braze (known to crack) to about 1/2". Gas tank is held by a various lengths of 1/4" cylinder magnets (lengths made by connecting multiple 1/4" long magnets) to my arbitrary arm positioner. It made it very easy to reposition as needed to get the braze to flow properly in such a thick fillet without falling off.

http://i.imgur.com/Iba4cl.jpg
Larger version (http://imgur.com/Iba4c.jpg)

Black_Moons
03-24-2011, 03:28 AM
Close up of fitting I made and silver brazed onto the tank to make a fuel gauge.
http://i.imgur.com/d2rXml.jpg
Larger version (http://imgur.com/d2rXm)

Close up of exhaust, Before painting and some grinding with an mini belt sander.
http://i.imgur.com/nhQ9sl.jpg
Larger version (http://imgur.com/nhQ9s)

Black_Moons
03-24-2011, 03:29 AM
This space reserved for future photos. :P

The Artful Bodger
03-24-2011, 03:50 AM
Nice work!:)

A.K. Boomer
03-24-2011, 06:57 AM
Wow what a gas hog, really --- isn't it amazing that my bro's 1990 honda CRX HF is rated @ 56 mpg (fuel economy.gov) and he's had tankfulls of over 60 mpg,
whats more is he's got a heater, a roof and windshield with wipers, can bring along a passenger and has a kick ass stereo,,, also has the option of going 110 mph if he wants -- all for under 400 bucks, im just saying --- where the hells all your fuel going:confused:

What could we achieve today (70-75mpg?) - over 20 years later with direct injection gas and variable valve timing? and why in the hell aren't we doing it?

We have the answers - were just not applying them.

if the arguments pollution control you really don't want to go there with the parts per million of whats coming out of that two stroke.

Hate to be a party pooper but Im just saying...

nice work though...

MotorradMike
03-24-2011, 07:30 AM
Well done!

Black_Moons
03-24-2011, 07:55 AM
Wow what a gas hog, really --- isn't it amazing that my bro's 1990 honda CRX HF is rated @ 56 mpg (fuel economy.gov) and he's had tankfulls of over 60 mpg,
whats more is he's got a heater, a roof and windshield with wipers, can bring along a passenger and has a kick ass stereo,,, also has the option of going 110 mph if he wants -- all for under 400 bucks, im just saying --- where the hells all your fuel going:confused:

if the arguments pollution control you really don't want to go there with the parts per million of whats coming out of that two stroke.
Hate to be a party pooper but Im just saying...
nice work though...

lol, Well, thats the problem when you limit to 50cc and not X hp. 2 stroke is a cheat on the CC limit. At least its only a 8000rpm motor, Some people cheat worse by getting 14,000rpm motors. Try making one of those quiet. The bike actualy IS reasonable quiet (Better then many cars that are driving around here), And I have plans to make it quieter.

As for where all the gas is going.. well, Out the exhaust most likey. An expansion exhaust does help however, As well as just well tuning it. Its not a very efficent design as its just not well supported by quanity of consumers. Its actualy very closely based to a 1940 german design. 2 strokes are not super efficent either.

Also, Wind resistance plays an important roll, as well as the mass that causes rolling friction and stop/go losses. Being as I only have 240lbs total mass, I still achive my 100mpg in heavy stop/go conditions. I could likey get much better fuel economy in a recumbent bike, Or by leaning forward a great deal. But I don't have a recumbent bike to mod, And don't like leaning forward much as it hurts my back. As such my bike is setup so I sit straight up.
As for the stereo, I have a MP3 player and earbuds, But I really perfer to keep my ears on whats going on around me.

But you are rather right, Its not designed to be efficent, Yet it still achives 100MPG. A better 4 stroke design can achive 150MPG, But at much lower HP for the same mass/size.

PS: I can bring along a passanger for 50MPG too. I have a second bike. :)

Evan
03-24-2011, 08:37 AM
All it would take to get better mileage is a transmission. I need one for my trike that uses the same motor. We live at the top of a hill with a one kilometre long road from the bottom that hits up to a 14% grade. If I gear it down enough to make the hill it has crummy top speed. I need to figure out an automatic transmission for it or a workable torque convertor. I have been leaning toward a planetary transmission that will give a 2 to 1 change in ratio for hill climbing.

MotorradMike
03-24-2011, 08:48 AM
All it would take to get better mileage is a transmission.

I think he still has the derailleur available for different ratios.

airsmith282
03-24-2011, 09:02 AM
nice ride, iam auctualy doing a conversion for a guy with a gas engine on a chooper bicycle once his motor comes in, might do my own mountian bikes as well. that or ill find a chopper bicycle as well and do one up i kinda like the chopper look ..

A.K. Boomer
03-24-2011, 10:43 AM
Your a good sport Black Moons, it is an out of wack comparison though,

The CRX engine is a 4 cylinder and each of those cylinders are 375cc, the entire engine displacement is 30 times greater and it has to push 1,800 pounds not including occupants.

topct
03-24-2011, 10:58 AM
I think one of those Chinese Honda clone engines would work in a bicycle. The 50cc one. Heavier than what you are using, but they have a charging system built in and a transmission with a semi auto clutch. Not a whole lot more money than what your paying for that 2 stroke.

http://www.hooperimports.com/product.aspx?pf_id=50cc3A-t

You can beat that price by shopping around maybe. I see them on disposable pocket bikes really cheap also. Easy to quiet down to almost silent.

hardtail
03-24-2011, 11:18 AM
Great job........I like your ball hitch clamp and your magnets for positioning.......nice job on the bung relocation. My only concern if you go off road and theres no spark arrester with that downward exhaust.........looks like thats the silver can though?

DougC_582
03-24-2011, 03:32 PM
Just a note: the China 2-stroke engines have a few common problems built-in. If you want to play with one, read the guides at one of the gas-motor-bicycle forums (motorbicycling or motoredbikes) and you can sidestep a lot of problems. You can even make a few simple-but-nice improvements, if you have a mill and lathe to use.

The 2-strokes also pollute a LOT. There's 4-stroke engines though, China/generic and Honda or Robin/Subaru.


I think one of those Chinese Honda clone engines would work in a bicycle. The 50cc one. Heavier than what you are using, but they have a charging system built in and a transmission with a semi auto clutch. Not a whole lot more money than what your paying for that 2 stroke....
The Lifan engines work much better, but then you must use a moped/pocket bike/motorcycle rear hub. A bicycle hub won't hold up under that much power for long.

Willy
03-24-2011, 03:37 PM
Nice ride Black Moons, looks good and hey, you still get your ass all over town at 100 mpg, not 20 mpg like in a mini-van.
I've done several of the engine kits and they are a blast, although none of the ones I did had the jackshaft/derailleur drive, nice addition.

Although not a sterling example of the latest technology in internal combustion engine design, they are easily made in a low tech environment and are basically a $70 dollar throw away engine, so don't expect stellar mpg and emission ratings. But still probably a lot "greener" than dragging your butt around town in a one ton dually in order to pick up a pack of cigs.:D

BM, I thought those engines were Chinese copy of an old Russian design?

Fortunately efficiency improves when you scale things up.
Using AK's bro's car as an example, at 60 mpg, I too have to say...what a gas hog his car is!
He's moving a ton down the road 60 miles and it takes a gallon of fuel to do it.
A new modern fuel efficient tractor/trailer combo can move that same ton down the road for well over 300 miles on a gallon of fuel...and that's payload! A freight train is much more efficient yet. Ships are again much more efficient.

So yeah, like comparing apples and oranges, still it's 100 mpg, no getting away from that.

Edited for spelling.

The Artful Bodger
03-24-2011, 03:45 PM
I ride one of these around town, we bought it new in 1977..

http://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Benelli_Motorella_GL_moped_-_20080315.jpg/220px-Benelli_Motorella_GL_moped_-_20080315.jpg

Black_Moons
03-24-2011, 05:39 PM
I've done several of the engine kits and they are a blast, although none of the ones I did had the jackshaft/derailleur drive, nice addition.

Although not a sterling example of the latest technology in internal combustion engine design, they are easily made in a low tech environment and are basically a $70 dollar throw away engine

BM, I thought those engines were Chinese copy of an old Russian design?

A new modern fuel efficient tractor/trailer combo can move that same ton down the road for well over 300 miles on a gallon of fuel...and that's payload! A freight train is much more efficient yet. Ships are again much more efficient.

So yeah, like comparing apples and oranges, still it's 100 mpg, no getting away from that.


Yes, I do have the rear derailer for additional speeds. Might get better then 100MPG, havent tested it too closely.. Other bike got 100MPG and its a single speed. Sure gets up hills in a hurry. My other single speed bike actualy does about 55kph and still makes it up the same 30 degree hill, except a little slower (About 10kph once it gets tot the top), the expansion exhaust really helps.

And yea, thats another huge cost savings, its $700 *NEW*.. for all the parts! (well except the bike frame), So no matter what brakes, its only like $150 absolute max cost, And very simple to repair at home. (Unlike cars where its absolute hell to get at ANYTHING), All the parts are pertty avilable too from multiple sources. Even a whole new motor is only $160~300 (depending where you buy it), And top end rebuild kits are only $50.

I have heard of repairs for cars where it was a simple part, Costs $100 to buy the part, known to fail every few years.. $700 in labour to get to it. Or the reverse, $700 part when its really only worth about $100, And every other cars part that does the exact same thing for the past 20 years only costs $100.
I forget if the design was russian or german.. I keep mixing those two countrys up.

Evan: I recommend checking out the "Sick bike parts" shift kit. Though you might wanna make your own bracket, the 17 tooth tooth sprocket they sell that matchs the motors chain is nice.. (though id kinda like a 20~25), And the cranks if you plan to use them (Need to either have freewheeled cranks, or a pull starter, as the rear freewheel needed to use a derailer screws up starting)

I altered the stock design to use a 9tooth sprocket and a 48/44 combo insted of the 10 tooth and 44/36 sprocket to improve the engines rpm match to human power. Still pertty easy to start. (Pedal to 10kph, put pedal crank at 45 degrees off top dead center, Engage clutch, Stand on pedal. Body weight does the rest)

sasquatch
03-24-2011, 07:34 PM
What an interesting project, and very nicley done. Thanks much for posting this. --(Geez, never know what one will find on this site with you very creative guys.):D

Carld
03-24-2011, 08:59 PM
Here's mine. You might know the wife caught me saying "just take the damn picture". It was windy and cool and I didn't have my flannel shirt on.

http://i82.photobucket.com/albums/j276/yeathatshim/P4070001.jpg

Willy
03-24-2011, 09:49 PM
OK, now that all of us geezer hooligans are out of the closet, maybe we can do a little highway jammin, and after we can hang around the local Dairy Queen and scare the sh*t out of some kids!:D


http://i76.photobucket.com/albums/j31/250willy/IM002736.jpg

gary350
03-24-2011, 10:08 PM
That is what I call, too lazy to pedal.

I have about 5000 miles on my home built bicycles.

This one gets about 45 miles on a good breakfast and about 40 miles on a good lunch. I cruise along at about 14 to 18 mph.

http://i43.photobucket.com/albums/e358/gary350/Bike02.jpg

I can cruise along at 24 to 32 mile on this bike fairely easy wind resistance is 2/3 less than an upright bike. It is pretty easy to ride and it is easy to ride 60 to 80 miles before lunch another 70 miles after lunch. A can get this up to 50 mph on a not too steep down hill. It will go much faster but I need eye pretection from the wind to see going faster than 45. This bike is really fast down hill it scares me to ride it 70 mph. I am not very fast going up hills.

http://i43.photobucket.com/albums/e358/gary350/low02.jpg

http://home.earthlink.net/~gary350/lowracer.jpg

This is a very fun bike to ride it is like driving a sports car very manoverable and quick. I have not put many miles on this bike maybe 200.

http://home.earthlink.net/~gary350/P-38-018.jpg

A.K. Boomer
03-24-2011, 10:29 PM
A freight train is much more efficient yet.


As efficient as a freight train is I wonder how much more efficient they would be if they reduced their rail flex to a minimum, have you ever watched the train tracks flex under the weight of each and every wheel that goes bye?

as efficient as the steel wheel to steel rail is they are really using up lots of energies in constant rail bending and sometimes its drastic like well over an inch compression.



You guys have some nice quality workmanship in those bikes...:)

Black_Moons
03-24-2011, 10:41 PM
Too lazy to pedal is right, I live where there is nothing but hills. I pedaled my ass off when I was younger. Enough of that! Now I take revenge on every hill I see. I have a hard time having fun when im exhausted.

I do often pedal off the line for extra acceleration however. And this new bike is much better geared for pedaling, and the transmission will allways be in the correct gear for pedal assisting. I think I have put about 25 gallons of fuel through my last bike over a year or two.., so about 2500 miles. Still runs fine. So far the biggest issue has been the odd flat tire (Usally seems to occure about 4 in one week, then none for months and months), And one fryed CDI. Hence why I carry a pump+spare inner tube in my backpack, And now used lined tires.

But yea, Now I can pedal at the power level I want, AND go the speed I want at the same time!

Also I can do nice things like slow down to jogging speed whenever I need to pass someone on the sidewalk, Then speed right up again afterwards. Cyclists often hate doing that because of the energy required to speed up again. Same with intersections, and hard to manuver areas.

PS: Food is more expensive then gasoline per mile. Go figure.

Black_Moons
03-24-2011, 10:45 PM
http://i43.photobucket.com/albums/e358/gary350/low02.jpg


This one looks scary to me, Theres no triangular structure to it, So unless thats some seriously strong/thick walled tube, or has some reenforcement bars im not seeing, I think would be very prone to bending/buckleing if it went over a speedbump or pothole at speed.

hardtail
03-25-2011, 01:42 AM
Guess your buying chain by the roll?

Dawai
03-25-2011, 07:23 AM
OKAY guys.. This thing does not require tags or insurance?

Semi-retired here.. health issues.. I have a el camino sitting in the driveway, "What does it cost to just sit there?" it has insurance on it, not full coverage, just Required liability and uninsured motorist. Sixty a month just sitting there. Harley is just sitting mostly too... too much pride to sell it..
New battery, new this, new that.. they go down about as fast sitting as they do driving.. I think I may have put more than the 20 year's miles on it this year.. I took a engine to a buddy in Rome in it. It needs a radiator cap right now.

MY POINT BEING: having one of these "useful toys" sitting around would be nice. IF I HAD to get to the doctor.. I could. If I had to get to the store.. I could.. I think I prefer 4 stroke engine.. a variable ratio drive of some type..

I gave my "mans bicycle to a kid who didn't have one" about a week later... I heard his Meth-head uncle stole it from him.. Now deceased.. the kid had the bike for a week?? he sure had fun with it here in front of my house, brought him happiness, brought me joy to make him happy.

I'll start looking for another mans bike.. I was considering a "special project high mileage car".. yeah.. lately I am considering smaller and smaller projects I can actually complete..

aboard_epsilon
03-25-2011, 08:56 AM
You need classic car "laid up" insurance ..my Triumph Stag is about 70 a year .

all the best.markj

A.K. Boomer
03-25-2011, 09:25 AM
This one looks scary to me, Theres no triangular structure to it, So unless thats some seriously strong/thick walled tube, or has some reenforcement bars im not seeing, I think would be very prone to bending/buckleing if it went over a speedbump or pothole at speed.


I like Gary's enthusiasm for his bikes but I agree with your analysis of the structural integrity,
Keep in mind that when the frame buckles the bike will immediately be propelled forward by the "inchworm effect" and for a brief split second could prove to be very exciting...

What also catches my trained eye is power consumption/efficiency and that bike eats it bad - you simply cannot have that radical of chain deflection angles on the loaded side and not expect to pay the fiddler and with the bicycle being such a limited power output source and I might add high torque/pulsation/propulsion devise their is a ton of waste going on in flexing and misguided loading...

Abner
03-25-2011, 09:26 AM
I think he still has the derailleur available for different ratios.

Yes, and could you use one or more to get the extra gearing you need?

Black_Moons
03-25-2011, 12:10 PM
Yes, and could you use one or more to get the extra gearing you need?

What extra gearing do I need? Its about a 10 to 34 sprocket on the rear, Gets me from 'redlineing up a 30 degree hill' in 1st to 'boging the motor down at 60kph' in 7th.

Black_Moons
03-25-2011, 12:25 PM
OKAY guys.. This thing does not require tags or insurance?

Semi-retired here.. health issues.. I have a el camino sitting in the driveway, "What does it cost to just sit there?" it has insurance on it, not full coverage, just Required liability and uninsured motorist. Sixty a month just sitting there. Harley is just sitting mostly too... too much pride to sell it..

Yep, No tags or insurance needed. Mainly because theres no way you could ever get a vin number (No catagory for it, No real way to get one for something totaly homebrew. Most homemade cars start with a dash (or door) and an engine to steal some other wrecks vin), And even if it had a vin, No catagory for insurance.

Legality varys from area to area. But generaly its found even where illegal, its ignored by the cops. You could end up with a $800 driving unlisenced/insured motorvehical ticket, However many people who have gotten these have gotten it thrown out at coart. (And most people who got one, got other tickets too, Like no helmet) I suspect it depends a lot on how you drive it too. I try my best to stay outta everyones way and let them continune on like I was not there.

they tend not to 'mold' in storage like cars too. especialy as they can be kept indoors and easily drained of fuel. (all 1.8 liters of it), And no real interiour to mold.. Just the seat and grips. (PS: Note the HUGE seat on the bike for comfert!)

Engine tends not to corrode either, being its 100% coated in oil inside. being 90%+ aluminum helps.

Likey a good idea for health issues too. Going at your own pace without all the angery drivers around forceing you to go 5kph over the speed limit will likey help keep your blood pressure down, And the odd pedaling does not hurt either. Going at 30kph really lets you look around and see the world.

Overall, it lets driving be a fun experiance again. As opposed to a highly regulated, lisenced, insured, speed regulated +- 5kph chore, With other people who clearly should'nt be on the road in the first place.

(As I drive mainly on the sidewalk, I don't have to deal with nearly as many of those drivers who should'nt be on the road in the first place. Just the one in 50 or so that can't even drive in thier own lane and drifts 2'+ over the sidewalk line because they wanna be looking down the center of thier lane for some reason)

Black_Moons
03-25-2011, 01:03 PM
Great job........I like your ball hitch clamp and your magnets for positioning.......nice job on the bung relocation. My only concern if you go off road and theres no spark arrester with that downward exhaust.........looks like thats the silver can though?

thanks, I was looking everywhere for decent sized balls, But only PA had trailer hitchs for about $3 each. Rather heavy.. should drill em out or something, But oh well, they work well.
The tiny C channel is actualy square channel cut in half. The 'cups' for the balls are just two short lengths of pipe, The whole arm was made when I only had a welder, drill and angle grinder :) C channel has bonus of holding one nut capative, So you only need one wrench or handle.

Note the mystery welds of steel to trailer ball and steel to cast iron. Who knows what the trailer ball is made outta. It welds though! :P Looks like copper under the chrome. But I guess chome does not plate right onto steel. Ahh, the things we do as noobs. Just weld anything to anything!

Bung relocation? Did'nt move any bungs. The fuel gauge one I turned and drilled a new hole and silver soldered onto. (The bottom of the bung actualy has a 0.1" lip or so so it goes inside the hole of the tank for self location)
Protip: (dull) Step drills are not for drilling thin gas tanks, unless you wanna dent the tank before you manage to drill a hole.

The other brass brazed bung was just a SERIOUSLY reenforcement of the existing bung that cracked and leaked at the joint on 2 tanks now. My *very old* engine kit actualy has a tank built about 2x as thick steel, and the bung has fillet welds (or brazes, its chrome plated so can't tell) nearly the size of mine. So I suspect thats how to make it and my tank is a new chinese POS.

(I considered welding to reenforce the bung, but welding a 3/16" thick walled bung to 22AWG steel seemed.. diffacult at best, And I suspected the existing tiny brass fillet would totaly contaminate my weld)

I silver brazed the top (fuel gauge) bung on because I wanted the no fillet, yet wanted a good joint. I did'nt think id be able to get brass to flow that nicely. Using silver braze was like... wow, it was like paying someone to do the work for me it was so easy. (And at the cost of silver braze, that isent far off) Course, I really only used like a few inchs outta the 15' of braze ($40). Silver braze wicks in REALLY thin.

Silver can is a glass pack silencer. Never really looked into spark arrestors. I guess it would be a good idea.. though I don't really go offroad with it.. Last time I tryed, that bung I rebrazed (Before i rebrazed it) cracked open and leaked like crazy from going over tree roots. Only real trails its suitable for are those that are well groomed. I think I will make a mental note not to go on such trails if its been dry however.
Around here, the biggest mental note I have to make is not go on those trails when its been excessively wet, or there is puddles everywhere. When its 'dry' its well, too hot to wanna do anything. :)

Bill736
03-27-2011, 12:27 AM
These 100 + mpg motorized bikes are neat and economical transportation . In the long run, however, if lots of them show up on roads, most states in the US will require license tags, insurance, inspections, emissions tests, etc. That's a shame, but it will happen. Never underestimate the power of government to destroy what people of vision have created. I know a disabled man in my state who got a ticket for driving his motorized wheelchair along the side of the road. He upgraded to an electric golfcart, and also got a ticket. It's illegal here to ride bicycles on sidewalks . Yet, where there are official bike lanes, they are sandwiched between lanes of automobile traffic , and any autos making a turn must cross over the bike lane !
As a result, nobody sane uses the bike lanes, but rather they keep to the side of the road where at least drivers are more likely to see them.

RB211
03-27-2011, 12:56 AM
I wonder if San Francisco would have a fit if I put a 2 stroke on my hybrid bicycle? Maybe if I put flower stickers and rainbow flags all over, and claim it is running on 100% organic veggie waste oil, they will not have a problem...

Black_Moons
03-27-2011, 01:49 AM
Depends on the state, However some states they are illegal, others they are legal. I wish the goverment would'nt just make up laws as they see fit without consulting... the people who are subject to those laws. As opposed to consulting those people who make and sell large SUV's and other competing forms of transportion about small motorbicycles.

Thankfuly, there are some people with sence to insulate me and you from the laws that don't actualy benifit socity.
In some areas where they are illegal, they are ignored by the cops.
In some areas where they are illegal and not ignored by the cops, the tickets are thrown out by the judges. (Even where 'illegal', Its not a criminal offence. Just a $800 or so ticket for driving an uninsured vehical.. here in BC at least)

Willy
03-27-2011, 02:12 AM
I agree the powered bicycle sport is a gray one at best.

I'm somewhat blessed for being out in the boonies but I still fly under the
radar as much as possible.

For instance since we have a mandatory bicycle helmet law I don't raise any red flags by not wearing one. Also, when I see a cop I just hit the kill switch and start "ghost peddling" as I'm coasting by at 25 mph.:D
Fortunately the market hasn't gone mainstream yet. When, or if it does, legalities will make operation of these vehicles more financially challenging.

Sometimes my old Harley seems more conducive to not attracting the attention of the "man".

John Stevenson
03-27-2011, 07:20 AM
Larger version (http://imgur.com/zXSxh.jpg)

http://i.imgur.com/LWepjl.jpg


So the pedals are going round all the while the motor is turning ?

If so your knee caps are going like buzz saws when they don't need to

Willy
03-27-2011, 09:06 AM
John, I believe he is using a freewheel crank set.
Not sure if he's mentioned it, but it is almost mandatory when using the jackshaft to drive through the derailleur system...either that or he's drilled and tapped his knee caps for grease fittings.:)

madman
04-02-2011, 08:50 AM
Cortizone shot in each knee daily??

Black_Moons
04-02-2011, 02:15 PM
Hah, its hard to see but the blue ring around the crank shaft is the freewheel's seal. The two sprockets are bolted togethor (Via 5 tiny bolts!) through the freewheel, and the freewheel is threaded onto the cranks (No idea how im ever gonna remove it! leg power = lots of ft/lbs of torque, And freewheels don't exactly unbolt easily)

Works very well, Even with altering the gearing some I can only really pedal assist up to about 4000 engine rpms (redline is 8000rpm)