valve

suzrider982
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suzrider982
Edited Date/Time 1/25/2012 5:07am
i have a 2007 rmz 250f with a pr2 motor in it pretty new low hours. what would casue my ehaust vaule to break?
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xnationalwrench 6/1/2009 6:55pm
6/1/2009 6:55pm
Maybe over revving or just needing for the valves to be adjusted
lapper
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lapper 6/2/2009 9:39am
6/2/2009 9:39am
What's PR2 say? My bet is not what you wanted to hear.
"Low hours" are relative. You might consider 20-30 "low" for stock. 2-3 could be living on borrowed time for a full race build 250F.
suzrider982
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suzrider982 6/2/2009 1:38pm
6/2/2009 1:38pm
no i had about 2 to 3 on the bike i have not called pr2 yet this engine was giving to my by a sponsor brand new . just seeing what some opions are had a few practices and 4 motos
williamsmotowerx 6/2/2009 10:37pm
6/2/2009 10:37pm
When the seats aren't cut perfectly concentric the valve head flexes everytime it seats. Most common cause of failure.

Also if guides are worn out... and sometimes out of a 1000 you get a defect valve and are SOL.

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suzrider982
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suzrider982 6/4/2009 7:25pm
6/4/2009 7:25pm
thank you
Yves Edge
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Yves Edge 6/4/2009 10:19pm
6/4/2009 10:19pm
just wondering, were your exhaust valves shadowing the pockets on the piston?

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