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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Two stroke VS four stroke. Facts & figures.
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[QUOTE="James, post: 892064, member: 27207"] I wouldn't agree that all of this info is "factual" Do you actually follow those schedules? I am curious how a piston in a hotter higher compression engine, with a single ring, and turning about 2k rpm more lasts twice as long? Same with the bottom end? If the CRF trashes clutches in short order, I don't see how it would be any easier on bottom ends and transmissions. I'd also say that in my experience, if you use good oil and keep your air filter clean, the CR top end goes 7.5 hours many times over. I don't know anybody that rebuilds 8 times a year much less 16. I also think there are a lot of other little 4 stroke items like oil filters, cam chain tensioners, oil pumps, etc that people put money into while I am simply rebuilding a top end each year. Matter of fact, if you are running a CRF hard enough to rebuild it 8 times a year, you will be replacing valves, springs, cam chains, more than once a year. Not meant to defend 2s or bash 4s in any way as I own both now and have owned several 4s (XRs, the truly reliable engines) in the past, but more an expression of doubt based on first hand observation of both bikes (CRs and CRFs) in action. I am even tossing Gomers experiences with 450s out as a statistical anomoly. Oh, the complete Wiseco CR250 top-end rebuild kit is $119 at motosport outlet. :cool: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Two stroke VS four stroke. Facts & figures.
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