Posted by Paul in MN on October 23, 2008 at 20:26:23 from (71.210.155.40):
In Reply to: Engine rebuild posted by Tom Windsor on October 23, 2008 at 19:17:07:
This may be just a bit of "mis-speak". But the #1 wire is always connected to the #1 spark plug, no matter where the piston and crankshaft are. What is significant is that the magneto rotor (or distributor rotor) is aimed at the #1 plug wire terminal of the dist cap when the #1 piston is at TDC of the compression stroke (meaning both valves are closed).
On a rebuilt engine, it will start with the spark being retarded (firing after TDC), but it almost impossible to start with the spark before TDC. Reason is that the premature firing of the gas mixture is trying to push the piston down before it has hit the top of its stroke, thus the engine is trying to start by running backwards while the starter trys to turn it forward.
After you get it running, then you can "dial in" the spark timing with a timing light (if the engine has timing marks). Some of the old timers can set the correct timing "by ear" by listening to how the engine is running. I never got that merit badge.
The governor on a gas engine doesn't care what the timing is. It is responding to the engine RPM.
Maybe this is what you were already thinking??
Have you thought about how to spin the oil pump before starting it? Does the oil pump on this engine need to be primed?
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