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Dirt Bike Brands - Other
KXF RMF 250 head problems
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[QUOTE="Rich Rohrich, post: 817389, member: 16241"] The Honda CRFs (both 450 & 250) have the exact same problems with valve recession, as do the YZF250s just to a lesser extent. Fine dust getting in through the carb float vents, air cleaner boot and various other places is certainly a logical reason why the hard coating on the valve face could wear away and cause the recession issues. Lots of folks have theorys ranging from dust to cam dynamics to inadequate valve spring tension and life. All these theory have real merit but IMO it's still unclear what the root cause is. All I know for sure is, running Kibblewhite stainless steel valves with their high quality springs and titanium retainers has proven to be a very effective fix for the CRF450 and the YZF250. Doing valve jobs and fixing these cylinder heads is the bulk of our four-stroke business lately. Kibblewhite is working on a fix for the CRF250 as well as the RMZ250. Hopefully in the next month or so we'll be able to post some test reusults. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
KXF RMF 250 head problems
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