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Dirt Bike Brands - Other
XR600 big bore questions
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[QUOTE="motometal, post: 566989, member: 24727"] I don't think you want to go to a 9:1 piston...that would be a step backwards. I just put a flat top (so called 10.25:1 Wiseco) in my XR650L. The stocker was a dished 8.3:1. With the new piston and port work it runs great on 91 octane, and I am at a lower elevation. cam is stock. I think on your bike, going to 9:1 you would give away some power. I like the idea of Rich's link, retarding the cam a bit or using an aftermarket cam, which would also tame compression a bit, although cams for these bikes are a bit spendy. SFO is right...look out for tired components and don't forget about the valve springs, particularly if you go with a cam with quicker ramps or more lift. Regarding vibration with the larger piston, my Wiseco (same bore) is about 10% lighter than the stocker and I don't notice any vibration, is your engine counterbalanced? So maybe a 660 Wiseco would weigh about the same as the stocker..?.. I expect my bike will run a bit hotter with the mods, but haven't noticed it yet (no hot weather yet). Trimming the bottom rear of the front fender helps in this area, also make sure your jetting isn't too lean! I've had my bike over 100 mph maybe once on the interstate before the mods (it was close to stock), and it was no big deal although I don't think it would do much more than that (and how do you know how high is ok to rev?). The guys that do over 100 off road on these are crazy! :aj: [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
XR600 big bore questions
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