Posted by gary (74.67.255.87) on August 15, 2009 at 23:28:55:
In Reply to: Briggs WM posted by Erik on August 02, 2009 at 01:56:57:
Make sure the valve clearances are right first. Check at top dead center with both valves closed. Intake is .007 " - .009" and the exhaust spec is .014" - .016".
An easy way to check the cam timing without tearing it down is to remove the head. Roll the piston to TDC. The valves should be either both closed or both "rocking". When the cam timing is correct one valve is just closing and the other is just starting to open ["rocking"] on the "overlap" stroke at TDC which is opposite the TDC stroke when both valves are closed and it fires. There is no close it is right on or off. If it is off then you have to pull it down. Works on almost any 4 cycle engine ever made. Dont try it on a Buick odd fire V6 !
Gary