I have a 1977 Batavus HS-50, its a 20 mph version. And this is what ive done so far
first I got a bigger 35 mph carb off of a mobat I completely cleaned it out absolutely every peice spotless, then i pressed the restrictor bushing out
of the intake pipe and bored it out about 2mm larger mostly to remove the ream at the bottom, then i got new points and a new condensor set those to specs. and finally I removed the rear baffle in the muffler. So after doing all this its top speed is 15mph. It takes off great and quite quick but when I get the rpms higher it boggs down and topps off at 15. So then I took the air filter and air filter box off and the power boosted about 5mph reaching 20. This time it didnt bogg out as bad but it seems like it has more of a power potential. So whats my problem, is the dwell of the magneto off and not firing on time, is it chocking on too much fuel, is there not enough fuel. I read freds guide and he mentioned that if i run it without a filter that the motor will starve for oil/fuel mix and lock up so if its my air intake thats the problem what kind of filter could i put on there.
by the way Im hoping to reach a top speed of about 30
and the engine has about 90 psi compression is that low for a moped? im mostly used to working on autos and 90 seems kind of low on the scale.
thanks for your time
never swarming but always destroying