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Safest Bore Possible
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Posted by: Rooshie31---------------------

I am currently on an 03 Yamaha YZ 125. I have been interested in boring over the cylinder to give me some more H.P. The only problem is that I don't have any idea how far I can take this. I've recently put on new reed valves, a Power Now throttle body valve, and have a Pro Circuit silencer kit. Im sure cylinder mods would effect each way the following equipment works. So my question is, is it a good idea? If so, how far should I go? Any Info would help. Thanks.

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Safest Bore Possible

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