Puch Dart Surging under throttle

Aaron Goldman /
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Need some diagnostic help with my Puch Dart.

Got everything setup properly, finally and went for a ride down the road. Seemed to be doing alright until I went down a hill full throttle. Bike sort of bucked, lost all power, then came back, then bucked again, did that a few more times until the only way to run it was to use 1/8th throttle.

Was the engine soft seizing or was this something else? It's all stock so I'm not sure why it would be soft seizing unless I absolutely murdered the timing on this thing but I think I got it pretty close to within spec.

Thoughts? This is my first e50 motor.

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