First off this a totally stock engine for cutting grass not a racer.
Going to adjust the valves. near as i can figure the spec. is
Intake .003-.005
Exhaust .005-.007
The thing that is getting me is the valve adjustment procedure.
It is stating to bring piston all the way to top dead center. Then back it off till the piston goes down a 1/4" then set the valve.
I would imagine the valve would still be partway open at this time.

I guess my question/s would be. Is this correct? and does this have something to do with the compression release?
Or three do i adjust the valves with them fully closed?

Keeping in mind this is a grass cutter not a racer.

Thanks for the help

Sad sad day i blew the lower end out of my 31 ci briggs single ohv. I still have a good cylinder head out of this. This was a 18hp or 18.5hp. Anyways i am picking up a new 21hp briggs intek 33 ci. single engine.
My question is, will my 31ci cylinder head fit on this engine along with the 31ci ES copper cylinder head gasket. This engine will remain stock lower end. just a billet flywheel and the cylinder head. and of course a adjustable carb with a K&N air filter all off the 31ci engine.
They tell me this new engine will be a AVS engine. The plan is to run it off the governor but keep the gearing conservative. Read no huge rpm.
 
This new engine according to ES i will need to change the hub in my flywheel to a avs one otherwise the timing will be off
The engine will be coming with a electronic ignition, will this work with the flywheel or will i just use my stock coil?
Is there anything i should remove from the inside of the engine, such as the governor gear or anything like that? If I should does anyone have any pictures they could post.
Yes i realize i should have better internal parts but the other engine lasted for quite some time. Not a power house for sure, But it did run good.

Sorry for the long winded topic but any help will be appreciated
Thanks

This series is still looking for a sponsor for the Lawnmower classes. They are still thinking of having us race but maybe not in all the races. It depends on sponsorship. If anyone is interested in sponsoring the series please contact the Midwest Indoor Racing Series.