Re: rrrg - another magneto question.

Posted by JRSutton on May 17, 2012 at 07:55:56 from (75.130.109.233):

In Reply to: Re: rrrg - another magneto question. posted by Jim Becker on May 17, 2012 at 07:16:58:

Ok - with all this good info - I may be getting somewhere.

The tractor is a 48 super A - but I believe the engine is a 50 (t in the date code).

The magneto is a Wico Model X - spec#XH-3001

I found a mag manual for lower model numbers - states the center lag angle marker is 13 degrees (close enough not to argue with what JohnT said - 12.5)

manual agrees with John T that each tic is 5 degrees.

That puts my current lag angle at 18 degrees.

If in fact the lag angle is, as you say, supposed to be up around 35 - that should certainly fix my problem.

And it looks about right to put the mag roughly where it should be so it can be adjusted back and forth a bit when mounted.

But that's a rather drastic move.

The tractor DID run fine with the mag as is. Starting was a problem because of the kickbacks.

Moving the lag angle up should solve the kickback problem - but if I'm understanding this correctly - will also advance the run advance an equal amount (assuming I turn the mag to get the snap after tdc).

I don't know what the run advance WAS to begin with - could have been way off for all I know.

But is it safe to say - if I were to set the lag angle to 35 - time the mag to fire on start say 5 degrees after tdc - that my running advance would be 30 degrees?

30 degrees sounds a bit much, no? I just have no idea what it's supposed to be on these engines.

Perhaps I'll split the difference and worry about fine tuning later.

I will dig through those pages you sent to see if I can find anything more.

Thanks again all for the help!

Replies:

• Change Lag angle doesnt affect run timing John T 10:39:41 05/17/12 (1)
  • Re: Change Lag angle doesnt affect run timing JRSutton 12:15:18 05/17/12 (0)

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