I love it. I kind of did everything at once, which makes it difficult to say what mod helped the most (and made troubleshooting that much more difficult), but I think adding the four valve head gave the most noticeable improvement. I just recently took off a Keihin type 30mm "pumper" carb and have put a Mikuni 26mm VM26-606 on it. I felt the 30mm was a bit too big (although a lot easier to tune). I'm having to make a custom cable for the mikuni (venhillusa.com) and don't have it jetted right yet, but I think it'll be a better carb. I've been recently thinking about going big with a stroker crank and maybe a 61mm+ big bore kit, but I promised myself that the next think I'd upgrade (and it NEEDS it) is some real shocks like Works Performance or Fox.. I tend to drive with an utter lack of thought for the survival of my buggy..or my back... 
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2013 Trailmaster XRX 150 Type 86 stroker
Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit
2014 Kandi 90B
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