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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Big CRF mods but bad results
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[QUOTE="Slippery, post: 1275760, member: 87392"] I Have a CRF 450R 06. I bought a Athena big bore kit, Hotrods stroker kit and a stage 2 Hot cam for my engine. I also fitted an FMF 4.1 factory titanium exhaust system. The engine capacity is now 510cc. The parts have been installed and the bike was tuned on the dyno. But I have not gained more than 2 hp from stock. And this is from a dyno that is known to run high figures. The main jet went from a stock 168 to a 175. The 42 pilot was not changed. The result was 49 hp at the wheel. After asking lots of questions it seems timing may be the issue. This would come from 2 things. The hot cam (not likely but possible) and the barrel that came with the big bore kit. If the barrel is slightly taller or shorter than stock it will alter the cam timing. This was not checked before installation. After taking the bike out for the day I realized it was more powerful when it was stock. It was very disappointing after the effort that had I had put in. Upon advice I have received so far, the only thing that can help me know for sure that I am on the right track is an adjustable cam gear. But I can not find one anywhere. So if anyone knows who sell adjustable cam gears for CRF's, or you think there are other possible reasons to my problem, please help me. I have only ridden my bike once in the last 5 months :bang: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Big CRF mods but bad results
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