Engine won't start

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  #1  
Old 05-14-03, 11:00 AM
renocj
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Engine won't start

I have a 12.5 HP Murray riding mower with a B & S engine. I have used it three times this season and it started right up all three times. When I try it now the engine will not fire. I can get it to turn but nothing else. I changed the spark plug and it is thowing a spark. I have tried carb cleaner and engine starter and all it does is shoot a blue flame out of the exhaust. I need help.
 
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Old 05-14-03, 12:37 PM
mower17's Avatar
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Is it still under warrenty?
 
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Old 05-14-03, 01:20 PM
renocj
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Well that doesn't give me much confidence. No it is not under warranty. I bought it used about seven years ago.
 
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Old 05-14-03, 01:35 PM
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It sounds like you may have a exhaust valve stuck open. Dose it seem to have any compression?
 
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Old 05-14-03, 01:48 PM
renocj
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No. I don't have any compression.
 
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Old 05-14-03, 10:36 PM
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Hello renocj!

I agree, sounds like you have a stuck exhaust valve.
 
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Old 05-15-03, 08:29 AM
renocj
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How do I get to the exhaust valve to fix it? I'm new at this so please forgive the dumb questions.
 
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Old 05-16-03, 12:07 AM
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You will need to remove the head to access the valve, and remove the valve cover (PCV valve). To remove the head, take the engine shroud off and remove the head bolts. The PCV valve is a rectangular box screwed to the side of the engine behind the carburetor. From there, you can see if the valve is stuck. If so, remove the head to get the valve out and clean it up. When you replace the head, use a new gasket and torque the head bolts in their proper sequence and to their proper torque value.
 
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