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RCM
03-18-2009, 09:56 AM
has any used thumper racings big bore up grade.
hondariderdylan
03-18-2009, 12:39 PM
i second this

i think that the 500-600$ it cost is worth it
anyone?
matt581yfz450
03-31-2009, 03:12 PM
i'm getting one for mine this year. i think its less than that.
hondariderdylan
03-31-2009, 05:13 PM
seems like your making one built up 250

post up some pics if you can
matt581yfz450
03-31-2009, 06:25 PM
yep i am building her up right now i'll post pics when i'm done.
hondariderdylan
04-01-2009, 06:11 AM
Originally posted by matt581yfz450
yep i am building her up right now i'll post pics when i'm done.

good deal:D
RCM
04-01-2009, 06:14 AM
I would like to see it too.
ryanh250ex
04-07-2009, 12:24 PM
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.