Small Engines (Lawn Mowers, etc.): Kohler Cv-14S, kohler timing

Question
I recently required a simplicity Hydro 14 with A Kohler Command CV-14S I ordered a gasket kit and started the engine rebuild today. First Problem- When I split the crank case the cam cam up with the case and lost the positioning. I brought it up to TDC and lined up the two marks on the crank with the one mark on the cam. So far so Good???? I believe this is the proper procedure. But for every one rotation of the cam, the crank rotates twice. what keeps spark ignition form happening at the end of the exhaust stroke as well as the compression stroke. is it mechanical or electrical. When I go to put the engine back together do I have to do something that would cause the timing to be off 180 degrees. Or am I over thinking this and when I reassemble everything will be just fine. second problem-I initially did the overhaul because of a blown head gasket. The kit came with new valve seals, what are the specs for the valve clearance. or do I need any?? thanks.

Answer
Most small engines have a "wasted" spark as the flywheel triggers the ignition twice in a four cycle engine.  The ignition is controlled by the flywheel and the coil.  The ignition timing is controlled by the flywheel key and the air gap of the coil from the flywheel.  Some Kohlers also have a CDI that controls the spark.

If you have the non-adjustable rockers, just a bolt going through them holding them down, there's no real adjustment.  If you cut new valve seats, then you may have some grinding to do on the valve, but if you did nothing more than lapping the valves, you should be okay.

If you have the adjustable rockers, .003-.005" is the valve lash for both valves.

Let me know if you have any questions or problems.  Thanks, PK.