[spareparts]

last time i chased down an rpm problem on a Yamaha, I asked around, ebveryone told me Yamaha's never have an ignition problem, after going thru the carbs three times, four set of plugs, rebuilding the fuel pump, guess what, it was an ignition problem, teh stator was not producing enough spark at higher rpms. I used a spark checker on all six wires, opened the gap to beyond 8mm(yamaha spec), found the spark becoming irratic, checked the coil output witha dva meter, found the stator was going bad, replaced it never had any more problems