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Yamaha MX & Off-Road Dirt Bikes
yz250f valve adjustment, when is it necessary?
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[QUOTE="Rich Rohrich, post: 665532, member: 16241"] The valve seats and the valves themselves can take a real beating when the clearance is off. Without pulling the head it's hard to say for sure if you did any harm. A leakdown test might give you some clue, but without a baseline test to compare against it's only minimally useful. If you did beat up the seats a proper valve job and a new set of valves (and probably springs) will bring it back to life, and you'll see a nice performance increase over stock if the valves and seats are properly massaged. ;) For now just adjust them to factory clearance and see how it goes. Keep an eye on them over the next few months. If the clearances move a lot in that time period it's a good bet the valves are damaged and need to be replaced. The Ti valves don't seem to have the same durability as the original steel YZ400F valves or the stainless replacements like the KIbblewhite valves. When the time comes, replacing the OEM Ti valves with stainless steel is a good upgrade for nearly everyone but the guys who live on the rev limiter. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz250f valve adjustment, when is it necessary?
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