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Cushman 300 fourtrax

2K views 9 replies 6 participants last post by  fishfiles 
#1 ·
Hey guys I am looking to upgrade the engine in my project which is a 1990 trx 300 and was leaning towards doing a top end rebuild with a 76mm piston my question is with everything else being stock would I need to upgrade the carb/exhaust also i need a little more power to haul the extra weight of the cushman body and I can't find any bbk avalible so what's your opinion
 
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