Got my A13 cam in the other day,installed it and WOW what a difference it made, it pulls through all the ranges and can't even feel the transition from low to high range, a friend and. Went out metal detecting today with the buggy we were past the 400 pound limit and it took all we dished at it on the trails. This is by far the best I could ask for out of a beefed up gy6 engine. I'm keeping it just like this for as long as it holds up 
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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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