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1. 05:00 PM - Adjusting rotor position on M9-35 mags (John Nafziger)
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| Subject: | Adjusting rotor position on M9-35 mags |
I've been experiencing difficult starting. I checked the timing on the
mags and the points open correctly set at -5 deg ATDC (these are M9-35
mags with 36 deg built in timing).
I noted that the left cap had arcing and a lot of carbon. A problem
that I see is that when the mag is timed to fire the #4 plug points
opening, the rotor is still 10 degs BEFORE the #4 wire position in the
cap (I'm guessing this explains the arcing). The right mag is
correctly positioned so the points open AND the rotor points to the #4
plug. Note this is the single finger rotor with the slick start
energizing the P-lead, not the booster coil and dual finger rotor
setup.
Assuming the above is not correct, how do you adjust the rotor postion
on these mags? It seems that I need to KEEP the cam that the points
ride on in the same spot, but shift the rotor. I noted an adjustment
on the lower "bar" that inserts into the rubber drive block, but I
think that will adjust both the cam and the rotor position.
Please email me directly as I only get the digest.
Thanks in advance,
John
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