[thumper racing] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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thumper racing
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Posted by: RCM

has any used thumper racings big bore up grade.

Posted by: hondariderdylan

i second this

i think that the 500-600$ it cost is worth it
anyone?

Posted by: matt581yfz450

i'm getting one for mine this year. i think its less than that.

Posted by: hondariderdylan

seems like your making one built up 250

post up some pics if you can

Posted by: matt581yfz450

yep i am building her up right now i'll post pics when i'm done.

Posted by: hondariderdylan

quote:
Originally posted by matt581yfz450
yep i am building her up right now i'll post pics when i'm done.

good deal

Posted by: RCM

I would like to see it too.

Posted by: ryanh250ex

I have no experience with the thumper kit, but I will say this....There is alot more to be gained from the bolt-on stuff and things like headwork, etc etc , rather than just bumping up displacement. I would spend the 500-600 bucks on headwork from Killian porting service in GA and a big carb rather than throwing a big bore kit. The gains you would feel would be from the bumped up compression, not from the extra displacement.