Re: IHC LA Engine Trouble HELP!!!!

Posted by KEB on July 06, 2007 at 20:31:20 from (72.19.170.5):

In Reply to: Re: IHC LA Engine Trouble HELP!!!! posted by H fanatic on July 06, 2007 at 09:12:00:

I just went out & looked at mine. I don't see any timing marks on the magneto at all. Here's how I would approach timing this engine. Ignore any marks on the magneto for the time being.

1. Confirm that the DC timing mark on the flywheel and the timing mark on the case do in fact correspond to the piston being at top dead center. If you pull the inspection plate off the back of the case, you can see the crank & watch when the piston is at TDC (or look through the spark plug hole & watch the top of the piston). This confirms that the flywheel is properly aligned on the crankshaft.

2. Verify that valve timing is correct per my previous post. This confirms that the camshaft is properly timed to the crank. If you have confirmed that the timing marks do in fact correspond to TDC, its probably easier to watch the timing marks than the piston.

3. Assuming that the timing marks on the flywheel and engine case align properly with both the motion of the piston and the valves, set the "DC" mark on the flywheel at about the 9:00 position, then turn the gear on the magneto in the direction it normally rotates until you feel some rsistance - this corresponds to the point at which the impluse spring engages.

4. Install the magneto (shift the magneto gear part of a tooth as needed to make the teeth align with the camshaft gear).

5. Turn the flywheel in its normal direction of travel until the impluse trips, and look at the relative position of the DC mark on the flywheel. If it doesn't align with the mark on the engine, increment the magneto drive gear one tooth at a time until the impluse trips at or just after the point at which the timing marks align. Turns out when I looked at mine that the magneto fires on every revolution of the crankshaft, so it doesn't matter whether you set timing on the compression or exhaust stroke.

Now that you've confirmed that both valve and ignition timing are correct, if the engine still doesn't fire there's a problem somewhere else. Either the spark is too weak, there's insufficient compression (most likely due to a sticking valve), or the fuel mixture is wrong. If you have spark, compression and fuel synchronized properly, it WILL fire.

Keith

Replies:

• Re: IHC LA Engine Trouble HELP!!!! KEB 20:36:21 07/06/07 (0)

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