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  1. Porting Theory , Tools, Techniques DIY

    Yamaha
    http://www.yfzcentral.com/forum/32-yfz-powertrain/115722-porting-theory-tools-techniques.html If anyone was interested in learning or doing some porting of their own... I took the time to compile a decent amount of photos and some information as to what is behind it all... I am 55 years old...
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