I'm happy with my set up but haven't went with a larger valve head. I did do a p&p myself and the Newfound power alone was pretty impressive. I'd say if you wanted to buy a larger valve head you should also go with a big bore kit. But even with doing that. It would require the engine case to be milled to accept the larger cylinder jug. It all adds up to $$$ you are willing to invest in your toy.
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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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