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Old 05-16-2017, 03:49 AM
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Default 78 Yamaha DT175 runs great to about 5000 rpms, then not so much

     

Hi all, I have a 78 dt175 and am frustrated. I can't seem to get it to run well past 5000 rpm. It runs and starts great to that point but then it just has nothing. No power.. and sound like it want to die? I read a post by val that said

"4 and 5 are your low and high speed coils, 6 is you lighting coil and 10 is you pulse coil.

I had a similar problem after putting in two remanufactured coils from Ricky Stator. As it turned out the problem cleared after the wire between coil 5 and the CDI were disconnected. (This may not be the case with your bike)

I think it pertains to the high speed coil. I have been chasing carb issues but could this be it?

(by that I mean I put a new Chinese knock-off carb on it)
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