Spence wrote:Question: How would I adjust timing on the valves? Is that done with the screws on top of the rocker arms? The rocker arms were loose in the box when I purchased it. I simply mounted them assuming that everything was preset. (I know but give me a break for at least attempting to do and learn rather than sit around waiting for a handout like many people these days.) So - do those screws control the valve positions and timing or should I look elsewhere to adjust.
I believe that I am getting combustion, but not at the right time to provide power.
You cannot really change or adjust the valve timing by removing the head. You can adjust the valve lash (clearance) by adjusting the screws on the rocker arms. If you did not set the valve lash when you reinstalled the head, this could very well be your problem. You need to set the valve clearances with the piston 1/4" past TDC on the power stroke for the cylinder your setting to .004" - .006" for both the exhaust and intake valves.
The flywheel key could affect the ignition timing, but if it's running on one cylinder and not the other, I doubt that's the issue. To check your flywheel key, you need to remove the retaining bolt and washer from the flywheel and look at the key way in the crankshaft and flywheel, they should be lined up. If the key way is off any, then the key may be broken and in need of replacement. If you remove the flywheel bolt, be sure to properly torque it back before starting the engine, as a loose flywheel will shear a key.
Here is a link to the manual for your engine:http://www.mymowerparts.com/pdf/Briggs% ... RATTON.pdf