Engine will not turn over


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Old 11-05-17, 03:20 AM
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Engine will not turn over

I have a 20 hp Briggs and Stratton motor on a craftsman rider mower. When you turn the key the motor will make one revaluation and stop. It is very hard to turn by hand. I have put in a new solenoid and starter. I also have adjusted the valves to the correct specs, put in a new spark plug, tried to jump it with a car battery and checked the timing. Iím pretty much out of ideas so if anyone has any suggestions it would be much appreciated. Thanks
 
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Old 11-05-17, 03:35 AM
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What model number is the engine?

You said you put in a (singular) new spark plug. Is your engine a twin cylinder?

What was the initial problem that caused you to replace the starter and check the valves?
 
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Old 11-05-17, 03:59 AM
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Check the dipstick to be sure the crankcase isn't full of gas,happened to me.
Geo
 
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Old 11-05-17, 04:21 AM
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Battery cables corroded (possibly under the plastic coating), which wont allow enough voltage to the starter.
You mentioned other parts you changed but you didn't mention changing the battery itself.
 
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Old 11-05-17, 04:37 AM
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Did you disconnect the drive from the deck. Possible blade problem.
 
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Old 11-05-17, 04:20 PM
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Forgot to mention I tested the battery and it was over 12 volts.
 
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Old 11-06-17, 02:35 AM
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A couple comments; 1 are you sure you adjusted the valves properly. 2 Sounds like the compression release on the camshaft is toast.
 
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Old 11-06-17, 06:06 AM
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"over 12 volts" on a battery at rest doesn't tell you much. Even a bad battery can show over 12 volts when there is no load on it. You need to test it under load.

What problem was the engine/mower having that caused you to work on it? Hard starting... hit something with the mower now it won't start... was blowing smoke... was making a funny sound. Give us something to go by otherwise we're just guessing.
 
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Old 11-07-17, 12:44 AM
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Sounds like a single cylinder engine and either mis-adjusted valves or a bad compression release on the camshaft.
 
 

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