Yamaha g-2 loses spark

[uncle woody]

I am working on a G-2 that loses it;s spark at about 3/4 throttle. After the RPM's come down alittle the spark comes back until the RPM's get high enough again then the spark drops out again. This is a never ending cycle. I have replaced the ignitor unit but it didn't change anything. The pick up coil test ok. I put an extra ground wire from the engine to the ground terminal on the battery, still the same. Where do I go from here?
Thanks Woody

[joehinvt]

g2's have a rev limiter built into them so you dont overrev them..you are probably hitting the rpm limit its set to....and thats why it starts right back up after the rpm drops..

[uncle woody]

That was my first thought, But I talked to a service tech at TNT Golf cars and he said they don't have a rev limiter. Plus this cart has run at this speed for several years with out a problem. I would have got back to you sooner but i was in the middle of replacing the pick up coil. No that didn't fix it either. I have also tryed a new ignitor unit. And the ignition coil test fine. There just isn't anything else left that would drop the spark like that. O yea the TNT tech also said that it could be a broken ground wire for the motor but I ran a new wire and that also did nothing. Thanks for responing.
Woody

[uncle woody]

If there is a rev limiter wher is it or in what part is it. Because my service manual doesn't say anything about it.

Woody