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Dirt Bike Brands - Other
03 CR 125 mods
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[QUOTE="steve125, post: 714412, member: 20272"] Jman I think you'll find the cylinder's timing spec's out around 12-12,500 rpm. It's a mess really. It's best to tune this motor for mid to top and dont worry about the low end. The std carby is jetted close and leave the reeds and reed valve alone except for closing the reeds stops to 8mm open. The best pipe for mid to top is the DEP!!! it rocks :thumb: and the PC for a bit more than stock. The cylinder is the main problem, large transfers and a real high ex-port. Funny though if you lower the cylinder to much for more low you won't get it, but will get less top. So .010 off the base, race fuel, match the transfers, a good piston thats not stock, wiseco SRS Vertex all fine, blend the ex-valve to the port roof when open, 380-400 main, DEP pipe with PC shorty, 1-2 teeth up in the rear. With all that it will be fast but not too easy to ride, but much better than stock. have fun :scream: :) [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
03 CR 125 mods
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