Probably the impeller itself...seems a common issue on other sites more familiar with the water cooled set...scoot dawgs... For some reason most of us here have lo-tech air cooled....but they run!
When you diagnose or get it fixed be sure to enter your findings back here...
:idea: plastic impeller,missing teeth and spinning freely on shaft is my bet
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'91 Yamaha Warrior- stage 2
'83 Honda ATC 70
'08 Yongjiang 125cc mx (Loncin)
'08 Yongjiang 150cc atv (Jinlong)
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