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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Great CR 80 mods. Low end??YES!!!
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[QUOTE="Rcannon, post: 886260, member: 26263"] Yes. I think I did it! A CR 80 trailbike. Obviously there are a thousand bikes better suited for the purpose. BUT..we owned a CR 80. Step one. Replace blown cylinder with a 2004 model CR 85. Needed the 47.5mm piston as well. This cylinder bolts right on with no other mods. Head is the same. Dont worry about the different upper end, small rod bearing. The new spec is different, but either the old or new one work wekk. I like the older bearing. It is slightly wider. This gives a hint of low end to the bike without doing anything else. Not much, but a glimpse. The real key is this [url]http://www.mxbonz.com/plates80250.jpg[/url] You can buy one from bonz, but I made my own. Use something at least 5mm thick. This makes the low end rideable. The finishing tuch is three or four intake gaskets. I could not find a source for a CR 80 intake spacer. The gaskets worked very well. These mods will let a 250 lb guy start off the line without slipping the clutch! Total cost is under 20.00. Do this to your CR 80. Do it now. It is that worthwhile. Oddly enough, top end power is still very good. The midrange rips. Now, the next step is sending this beast off to a certain MR Gorr for low/mid porting. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Great CR 80 mods. Low end??YES!!!
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