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They are good, the hp will be the same but they are a good bit faster because they a 4 spd manual clutch and the clutch is off the crank. I have the same motor as you and the only reason I wouldnt have went the gpx route is the class I race does not allow it.
 

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Anything and everything you need to know on a GPX or anything related you can find using the search and there is Tons of real good info...;)
 

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a stock gpx, will pull any 88 off the line, the horses are the same, but the gpx torque kills 88s, a 146 bvh done up is just as fast or faster than honda 124s, top and bottom end, they are very good quailty, the only problem that has occured(that i no of) is that if you dont run a chain guide, the chain can crack the fly wheel cover, so make sure you run a chain guide. other than that, there amazing
 
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