I had a similar scenario a few weeks back.i actually had a slightly stretched clutch spring. I ran and idled fine until it warmed up then it would try pulling itself slightly and kill the engine.relaced with another clutch unit and problem solved
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MASTERBATES
TM 150 XRX-P&P head,A13cam,opened exhaust,140 main,38 pilot,adj cdi, perf coil,115mm variaitor,12 gm rollers,NCYpulley,2000 rpm springs,racing clutch,taller rear tires,and etc. 
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