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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Bore Kit for 00 YZ 25
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[QUOTE="EricGorr, post: 147475, member: 19611"] The actual sizes available are 133cc 56mm (Wiseco 726MO5600) 139cc 57mm (Wiseco 631MO5700) 144cc 58mm (Wiseco custom EGORR) and 155cc 60mm (Wiseco custom RPM). The 133 & 139 don't require crankcase mods for piston clearance but the bigger sizes do. The 133 is a good choice and the pistons are never likely to go out of stock for more than a period of 2 weeks. The 139cc piston is a Wiseco oversize for a 1993 YZ125 and those could be out of stock for as long as 6 months. Its a flat top piston and fairly heavy. The Wisecos that RPM has custom made are likely to be in stock and RPM is a stable company, however the pistons are fairly expensive at $160 Generally speaking as the bore size is increased the peak rpm drops but the torque peak increases but at a lower rpm. The 133 is AMA legal for the modified amateur classes and is the most cost effective choice. Good luck [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Bore Kit for 00 YZ 25
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