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Wico C timing question

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Jerry S

03-06-2002 12:13:11




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I was checking my mag and it fires OK bench testing but the mark on the back side is in question. I know a wico X mag should be timed 2 1/2 marks to the left of center but don't know what the C should be. This one is currently at the very left of the 11 marks. I need to know what the right timing is. Thanks for your help.




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Clooney

03-06-2002 12:31:58




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 Re: Wico C timing question in reply to Jerry S, 03-06-2002 12:13:11  
Jerry, you didn't say what the application is but the C is same as the X for most uses. ~The center hash mark is 12.5* & each graduation is 5* so 2.5 marks left of center would be 25* on a counter-clockwise rotating mag. 3.5 marks would be 30* & 4.5 marks would be 35*.



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Jerry S

03-06-2002 14:15:33




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 Re: Re: Wico C timing question in reply to Clooney, 03-06-2002 12:31:58  
Thanks Clooney. I knew you would know. I am using this on a 45 B but it came from a 50 A. I am assuming that this change means only that the electrical impulse happens when the governor shaft is at a different point, right? Does this timing also have an effect on whether the impulse hits the correct spot in the cap? I can't understand why it was timed so differently. I further don't know why I was able to get spark from each of the cap plugs. Did the fire have to jump a ways to get to the post?

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Clooney

03-06-2002 14:44:41




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 Re: Re: Re: Wico C timing question in reply to Jerry S, 03-06-2002 14:15:33  
Jerry, actually the "impulse stop ring timing" is what you are setting. You are only adjusting the point that the impulse fires the mag, the C mag has no advance built in so the actual running timing is controlled by the point gap & point position compared to the crankshaft. ~When to you set the impulse stop ring to 25* retard, you are taking 25* of advance out with the impulse. You set the base timing to TDC (L/H impulse) & when the engine RPM goes over approximately 250 RPM the impulse quits retarding the mag & it reverts to running timing. ~Seeing as the mag was initially set to TDC with a 25* retard (impulse withholding 25*) as soon as the engine goes over approximately 250 RPM the 25* retard is gone & the mag fires 25* degrees ahead of it's initial setting.
~The mag always sparks with the rotor in the same place because the points are fixed & don't move like a distributor with a movable breaker plate or movable point cam. The impulse actually holds the mag from turning while the flywheel keeps turning & when the flywheel reaches TDC the impulse lets the mag spin to catch up & when the points open it fires. After the impulse reaches approximately 250 RPM the little impulse arms pull in from centrifugal force & the mag fires 25* before the flywheel reaches TDC. ~I hope this is clear, if not post back & I will try to explain it another way.....

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Jerry S

03-06-2002 16:00:00




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 Re: Re: Re: Re: Wico C timing question in reply to Clooney, 03-06-2002 14:44:41  
Thanks much. That makes good sense. I am glad I asked.



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