Mower running problem

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  #1  
Old 11-04-18, 10:50 AM
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Mower running problem

I have an 18hp Briggs OHV. Just replaced a blown head gasket. Ajust valves top dead center, intake. 004 and exhaust .006. Starts fantastic runs smooth for about 10 minutes, starts sputtering, then dies. Oil is good, new fuel filter, same problem with air filter off. Can wait 5 minutes restarts runs great for maybe 2-3 minutes then sputters and dies. I'm thinking maybe Armature is going bad ,but I just don't know?
 
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Old 11-04-18, 11:08 AM
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Does it faint the same way after 10 minutes with the Gas Cap loosened ?
 
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Old 11-04-18, 11:09 AM
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Try loosening the gas cap the vent may be clogged. Have a good one. Geo
 
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Old 11-04-18, 11:35 AM
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The problem you're having sounds like fuel cap - that sort of thing. But on your valve adjustment, that should be done at 1/4 inch of stroke past TDC.
 
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Old 11-04-18, 01:58 PM
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Since I remove the gas cap the motor has not stop for a long time now I think you guys are right hit the nail on the head!!! Thank you very much
 
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Old 11-04-18, 03:45 PM
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Will leaving my valve ajustment alone, not making the ajustment 1/4 inch past TDC cause harm?
 
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Old 11-05-18, 05:40 AM
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Mainly harder starting with the compression release affected. Also the valve lash on the exhaust valve would be too tight when running. It has to close fully in the compression and intake stroke. Although performance may suffer it would be hard to evaluate the actual harm. It would likely be more long term.
 
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Old 11-05-18, 07:22 AM
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I don't want to lose performance. Will re-ajust. Thank you very much again
 
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