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Briggs & Stratton 33M777/21HP

Starter will not spin engine over compression-Battery and starter both tested, good order..mention of Automatic Decompression Device as aid to starting, no details in owner's manual, seeking technical manual I am a retired auto Mechanic, 50 years'experience, always refer to Tech Manuals for specific info--can you help here?

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Check your valve adjustment first as these uses a decompressor that on the camshaft itself.

Now while checking the valve clearances as you go past TDC of the compression stroke there should a little bump on the intake valve when the decompressor is working. If this bump is not there and the valves are set correctly then the decompressor has failed and requires the cam to be replaced.

10 276781SingleCylinderOHV pdf

Posted on May 02, 2015

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Posted on Jan 02, 2017

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