Senior Clinician
Currently Offline
Petrolhead, tinkler, but I love to mess around in my garage.
Posts: 119
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Joined: Apr 15, 2010 8:39:00 GMT -6
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Post by scootaway on Nov 20, 2010 12:00:33 GMT -6
I know there are a few threads on this subject. The question whether you should set the valve lash hot engine running or cold engine off. Well I tried both and i think the cold method is more accurate and gives more performance. This is why. The smaller the valve lash the bigger the valve lift and the more air/fuel charge gets sucked in. Obviously there is a danger if the lash is too small for you will burn the valves. With the hot setting you never know when enough is enough. Between the hot and cold setting the lash was rather bigger (hot) which means that the valve does not open to its maximum and less charge gets sucked in. With the cold setting you can't really go wrong in terms of the lash. Unless there were other variables at play such as weather (more atmospheric pressure today) I believe my YY250T Jonway pulls better with the cold method.
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Post by Alleyoop on Nov 20, 2010 14:22:41 GMT -6
Scootaway, You are correct, it is better to adjust them when engine is cold since when hot metal expands and the adjustment will be off and will most likely be to tight. Alleyoop
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