Posted by JRSutton on August 11, 2011 at 08:17:47 from (75.130.109.233):
In Reply to: Re: Magneto posted by scatter on August 11, 2011 at 06:39:36:
What might help is to pull all the plugs, and just slowly turn the engine with the hand crank. With no plugs it's very easy to crank accurately. and you can really get a feel for the timing.
Then you can just put your finger on the number one plug hole (nearest the radiator) to feel if you're on the compression stroke.
Then you can check for tdc.
If you put a long stick/straw in the number one hole, you can see for sure where tdc is, and if it's clicking at or slightly after tdc, which is what you want.
If you're unsure exactly where tdc is (rely on the stick/straw method, not a timing mark) then fail on the slightly "after" tdc side of things.
As long as you do this, you should be close enough to run just fine.
I doubt there'd be any real advantage to fine tuning it further while it's running. You can, but if you do, just be SURE to re-verify afterwards that it's firing AFTER tdc using this manual check method,
As somebody else said, you never know when you might have to hand crank the engine, and having it fire before TDC can break bones.
Also, I know this is probably quite obvious, but just in case it's not... when the mag snaps, it is going to fire on the position the rotor is snapping TO, not from.
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