Once again I need the expertise of the Home Machinist community. I just finished building the Philip Duclos Odds ‘n Ends Hit ‘n Miss Engine, (it took about a year on and off). However, I’m having a hard time keeping it running. Initially I am using stronger springs on the governor so that it would not engage just until I got the engine running well, but it seems I’m having a problem with the mixer, (carburetor). I tried using both Coleman Fuel and gasoline and the result is the same. I open the needle valve about ¼ to 1/2 turn and spin the flywheel while holding my thumb over the intake until I get a pop from the exhaust. Next I give the flywheel a brisk spin with the intake open and the engine will fire anywhere from 6 to 10 revolutions then stop. If I try opening the needle valve on the mixer (carburetor) a little each time I spin the flywheel sometime the engine will fire and sometime it will not. If I open the needle valve too much, (usually more than a turn) I get a strong odor of fuel as well as raw fuel coming out of the exhaust port. The needle valve has a 75-degree angle and the inlet diameter of the mixer is a #60 drill (.040” diameter) as per Mr. Duclos’s blueprint specs. I am using a NOS Pontiac Coil Company Buzz coil, a 6-volt battery and a HONDA spark plug. The “Buzz Box” throws one hell of a spark even on a 6-volt diet. I think my problem lies with the fuel/air mixture but any help might keep consulting my other friends, Jack Daniels and Jim Beam, not that’s a bad thing J. Thanks in advance and Merry Christmas!
Robert (Bob) Cvarovsky