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Uneven dirtbike front suspension?

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  • Black_Moons
    replied
    Update for you all, Got new seals, filled with oil, put them on, put shocks on bike, pushed forward and...... Nothing. No rebound. Seized up good. Odd since they worked decently on the bench except for end of travel of one.

    Replaced the one most prone to seizing and.. still too much sag (half the suspension travel) and very high friction.
    Oh well, there goes $15.

    Put the old, more rusted shocks on that where on it when I got it, filled them with oil as I can't swap the seals due to a different design that looks harder to replace anyway and... amazing, very little leakage and good dampening/rebound, it no longer tries to wobble around going down my driveway.. and the front end just floats up and lands softly while doing wheelies with no clunks or thuds at all.

    I think the previous owner didn't tighten the pinch bolts or axle or something properly either.. the front wheel could be turned a few degrees to either side if you forced it and would sort of stay that way (movement in the forks?) but now its rather rigid and returns to its original position.

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  • A.K. Boomer
    replied
    some of those little 80's were fun to abuse alright, then they came out with the little water cooled ones and hopped them up even more,,, amazing balls for such a little engine, would make you think twice about turning one of those over to your kid....

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  • topct
    replied
    Considering that the bike in question is 34 years old, and it was a kids trail/dirt (not a motocross) bike that smacked into countless trees and rocks, driven by overweight dads and big brothers trying to demonstrate their prowess or of lack thereof I consider the fact that the forks still actually move at all a bonus. I would actually be more concerned about the engine/trans than anything else. If it still runs and shifts at all would be a real surprise These poor little things by there very nature and 99% of the people that bought them have more often than not been through hell and back.

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  • A.K. Boomer
    replied
    Totally disagree - bikes like that have to be designed for it,,, extra ridged fork braces and axle stability and things like that are crucial --- if he's thinking he's got a bike that's built from two different bikes then he needs to do a little research and or testing of his own...

    My MT. bikes front suspension is immune to this kind of thing as it's a headshok and has totally ridged front forks and just one shock in the middle of the headset that controls both spring rate (*air) and dampening/return

    you can always count on your front wheel tracking true over rough stuff as there is no give on one side and stiffness on the other,,, what's really crazy is the lock-out designs on twin teliscoping tubes that just lock-out one fork blade,,, you can literally lock the front end out, push on the front end whilst holding the front brake and watch the top of the front wheel arc over to one side --- nice,,,,,,, NOT....

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  • oxford
    replied
    Like some of the others said, I wouldn't worry about it. Once they are tied together and moving as a set they are averaging each other out. It was mentioned already but some modern mx bikes only have a spring in one leg, the other has rebound and dampening adjustments. You can also mix spring rates from one leg to the other to get rate you need.

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  • Black_Moons
    replied
    Originally posted by Ironwoodsmith View Post
    Be sure and get all the old oil out by inverting the fork and pumping it till empty. I usually flush mine with diesel or paint thinner before refilling.
    I took them totally apart and washed em out with my garden hose as there was tons of old sludge and crap in there. they no doubt need new seals anyway.

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  • Ironwoodsmith
    replied
    Be sure and get all the old oil out by inverting the fork and pumping it till empty. I usually flush mine with diesel or paint thinner before refilling.

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  • mattthemuppet
    replied
    Could be accidental (odd tubes) could be by design (slightly different damping rates or stages for each leg). Either way, I wouldn't Futz with it until you've actually ridden it. You're best off dialing in the rough damping range by playing with the oil weight first anyway and you can mix different weights to get there too (there's some funky calculator you can use to work out exact volumes to get the right right). You can also vary oil height to get the progression how you want it. Might be worth checking out what the recommended spring weight is for you weight.

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  • Peter.
    replied
    Many bikes have compression damping in one fork and rebound in the other. I wouldn't sweat it.

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  • Yow Ling
    replied
    I think you may have sucessfully found a fault that doesnt exist.

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  • Black_Moons
    replied
    Interesting that some bikes use the spring on one side and shock on the other. Sorta seems like it could try and cock and jam but I guess the tubes are too long for that.

    I hope I can just add oil then, it only had about 10ml of the strongest smelling oil I have ever smelt in it. Manual calls for 10W.

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  • andywander
    replied
    Originally posted by JoeLee View Post
    The OP's bike isn't a Gold Wing. Most of the old Yamaha's forks were tied together with the fender bracket so they had to move evenly.

    JL............
    Ummm-the Gold Wing's forks are tied together with the axle, so they, too, need to move evenly.

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  • JoeLee
    replied
    Originally posted by outlawspeeder View Post
    It is normal for them to be different. Gold Wings have the anti dive on only one side. My GS 1100z had the adjustment for the anti dive on the right side.
    The OP's bike isn't a Gold Wing. Most of the old Yamaha's forks were tied together with the fender bracket so they had to move evenly.

    JL............

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  • Ironwoodsmith
    replied
    It should not be a problem. The new mx bikes have the spring in one leg and the dampeners in the other. Much bigger difference than you are describing. The main thing is how well it is doing the job of dampening for your weight and style of riding. Adding oil will help to keep the forks from bottoming on big bumps. The less air in the tube will act like a spring when it is compressing. So adding some oil will feel like a stronger spring. Upping the weight will help with the compression dampening. What weight oil does it call for?

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  • outlawspeeder
    replied
    It is normal for them to be different. Gold Wings have the anti dive on only one side. My GS 1100z had the adjustment for the anti dive on the right side.

    Leave a comment:

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