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powermore 139cc ohv quits after warm?

1 year old mower quits after about 2-3 minutes and wont restart till cool. plug new air filter clean. yardman 21 inch cut. i'm stumped, can anybody help me out??
greg hitts, March 2008
Adjust the valves.

Roger, September 2011
Check to see that the fuel tank cap is vented properly -- it sounds as if the venting hole is blocked, thereby creating a vacuum in the tank and stopping fuel flow to the carb.

steve, May 2008
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