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I have one with the 170 upgrade done by kickass racing, piston obviously, ported head, bigger valves, cam, exhaust, pcv with custom tune. Now my good friend has the grom that was owned by Brian after he did all his homework with it and parts building he decided to sell it, and that one has the 170 and all that but with even more head work done. We've been out groming every weekend since and they are amazing, they just blow away the stock one that our other friend has. Now I'm not sure what extra work the one Brian had has done to the head but I'm 5'10 190 lbs, my friend john that has Brian's grom is a big boy, he's 6'5" and 290 and he pulls away from me, that's saying somethin for kickass racings custom motor work.
 
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