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Dirt Bike Brands - Other
tweaked valve on yz 250 F
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[QUOTE="DualSportr, post: 124805, member: 19592"] If you can actually see a "dent" where the valve hit (even if it's small), then it smacked pretty hard. Normally they'll just leave a ghost pattern on the piston where there's less carbon buildup, and on the valve with a grey area. I think you've diagnosed it well. They'll have to replace the valve and grind the seat to match the new (unbent) valve. The guide should also be checked. The other valves (and stem seals) should be replaced to, just on gp. They can do a 3 angle valve grind on the seats at the same time, this'll give the head a little better flow, so you'll get a bit more hp for all this work :) Have you determined the reason it occurred? This would be the first thing I'd be figuring out. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
tweaked valve on yz 250 F
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