07 cr250 noise?

honda123
Posts
188
Joined
6/3/2012
Location
AU
9/17/2014 8:04pm Edited Date/Time 9/17/2014 9:31pm
i just baught a cr250 and the guy i baught it off said the rc valve makes a knocking type noise and not to worry they all do it, i rode it and the bikes fine apart from that noise, it only makes the noise when im in heavy deep type dirt and in high revs? i did some research and the rc valve shouldnt make any noises, and apart from that noise the bike is in great condition, any ideas on what it could be?
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digger
Posts
736
Joined
4/1/2008
Location
Upstate, NY US
Fantasy
3803rd
9/17/2014 9:31pm
That's detonation. It will over time ruin the topend. The 05-07 cr250's need to have the squish band corrected (recut)to fix the detonation problem while running on pump fuel. If you don't want to, or cant get the squish corrected ,your best bet is to use a fuel with an octane above 100 to prevent the detonation.

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