So I picked up a zinger a couple weeks ago... Only rode it once, and tookit apart... PO had hacked the exhaust off, and the neck bearings were trashed... So I put it all back together and fired it up... Seems to run decent on the bottom and middle range throttle, but seems to be rich on the top end... I did put a uni filter on it, ditched the oil injection and put a oem exhaust back on it... Do the zingers lose top end power when the exhaust starts getting plugged? Or could that be a fouled plug? Any input would be appreciated...