Ok so the GZ is fixed now. The surging was caused by a bad jet. It was basically running beyond rich and flooding itself. The backfire and die was being caused by a combination of issues. The side stand safety switch was tripping while riding causing the engine to die and the unburnt fuel would cause a backfire right after. After rejetting the carb and cleaning the safety switch she runs like new! This guy is one happy GZ owner.
Last edited by GreenFamily; 03-08-2015 at 10:33 AM.
Reason: spelling error
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