Re: Briggs 11 hp won't run

Posted by Clary on April 29, 2004 at 05:49:03 from (4.152.105.138):

In Reply to: Briggs 11 hp won't run posted by Jerry Seilhamer on April 27, 2004 at 12:19:44:

I work on small engines all of the time & know for a fact that you have to have fuel, Compression and a spark to get things running plus everything has to happen at the right time.
1st run a compression test - It needs to be around 125 psi - You say you checked the flywheel key - Was it just a visual inspection w/o pulling the flywheel? If so the flywheel has to come off because the key can be sheared even the smallest amount & cause the ignition to be out of time.
Is this an eng.w/points or electronic ignition made onto the coil? If it is electronic it will fire even w/a sheared key.
My bet is that the intake valve is not seating off & causing the blow back thru the carburetor.
The valve will need to come out & the valve face & seat will need to be cleaned then laped in & the valve face may also ne to be refaced in a machine shop then lapped in w/lapping compound.
If you do this then check the valve clearence between the valve stem & lifter - W/the engine on the compression stroke & piston @ top dead center and both valves closed it should be around .011 thousandths.
Try this and let me know if things work out

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