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Adjusting valves - warm or cold engine?
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Posted by: dhardison

Since metal expands when it's hot, is it necessary to warm up the engine before performing a valve adjustment or should they be adjusted cold? (I have a 250EX)

Thanks,
Dan

Posted by: 300exOH

You always want to adjust valves with the engine cold. The purpose of the gap is to compensate for the heat expansion of the valves.

Posted by: dhardison

quote:
Originally posted by 300exOH
You always want to adjust valves with the engine cold. The purpose of the gap is to compensate for the heat expansion of the valves.

Great thanks!

Posted by: motoboy66

quote:
Originally posted by 300exOH
You always want to adjust valves with the engine cold. The purpose of the gap is to compensate for the heat expansion of the valves.

He is correct, the Honda ATV's are done cold, but there are some engines that are adjusted WARM. Always look in the owners book, or call a dealer if your not sure. If you adjust them cold, and the engine calls for it to be done warm, the valves will be too tight and you will proubly burn them and cause yourself a big bill.

Posted by: dhardison

Good to know thanks.