I have a problem , no spark !
Iv'e rebuilt the 250/4 Honda, and it's tight, cranking speed is way down , and will remain so until it runs a few minutes , the electric starter motor is typical Honda, built "just" powerful enough to do the job, with a stock engine,(most times)
At the start line before the last run I had a lot of trouble getting it to fire, so I had suspicions something may have been on the way out electrically, possibly the starter ?
I threw a bare crankshaft into a spare set of crankcases, starter & associated drive / spark generators in place, and spun it, with the race bike CDI plugged into the "test" engine, SPARK !
Tested the impedance of both sets of spark generators (hall effect?) , both sets within specs, I also checked while spinning engine(s), impedance rose with revs, the "test" engine spins abnormally quick, as it only has a crank to spin (no rods/ primary drive) I think (by ear) the rebuilt engine spins below 250 rpm when cranked.
Does the average CDI unit have a minimum cranking speed for the spark trigger event to happen ?
Tiny