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Adjusting rotor position on M9-35 mags

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jsnafziger(at)yahoo.com
Guest

Posted: Wed Mar 14, 2007 4:00 pm Post 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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db2005(at)2wings.com
Guest

Posted: Thu Mar 15, 2007 7:08 am Post subject: Adjusting rotor position on M9-35 mags

" Please email me directly as I only get the digest."   Doesn't this exclude

everyone else from the benefit of being on the list?



If anyone has an answer, which I wish I did, could you please also post it

to the list? I'm curious what the solution to his problem is.



Thanks,



Darin Bishop

www.2wings.com

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george(at)gesoco.com
Guest

Posted: Thu Mar 15, 2007 11:33 am Post subject: Adjusting rotor position on M9-35 mags

No.

	The rotor moves according to speed. It must be lag the #4 point at

idle and will lead as it advances 35 deg. If you put the rotor at the # 4

pin at static then when it advances 35 degrees when running, it will fire

the # 6  plug!. There are only 40 deg between each spark plug electrode (360

deg / 9 = 40 deg).  

	Arc tracking and other carbonization inside the rotor cap is usually

caused by other factors. Things like bad coil/capacitor. Moisture in the cap

dirt in the cap etc. 



George

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jsnafziger(at)yahoo.com
Guest

Posted: Fri Mar 16, 2007 5:59 am Post subject: Adjusting rotor position on M9-35 mags

Groups,

I wanted to share what I’ve learned with these M9-35 mags.  Please note

these differ from the M9F mags that are typically on the M14P, so the

timing procedure is slightly modified from what Dennis summarized in

the prior email to the Yak list.  Many thanks to Dennis and George Coy

for the help!  George shared an excellent write up on Russian magnetos.

 If anyone would like a copy, please email me and I’ll pass along to

save George the headache. 



I summarized George’s emails below:



The M9-35 has mechanical advance mechanism in the magneto. The angle

stamped on the magneto cover is the amount of advance angle (usually 30

to 35 deg). This is the amount the rotor will advance when the shaft

rotates above a certain RPM (I believe it is 600 RPM).



The rotor moves according to speed. It must LAG the #4 point at idle

and will LEAD as it advances 35 deg. If you put the rotor at the  # 4

pin at static then when it advances 35 degrees when running, it will

fire the # 6 plug! There are only 40 deg between each spark plug

electrode (360 deg / 9 = 40 deg).



I am not sure the proper angle, but suspect you need to split the

difference.  More Lag on the idle would put the finger closer to the

previous cylinder. 



As long as the right mag is not used for starting and is off during

start I do not see why it could not be set up with more lag at static

so that the finger could be closer to the pin at the 35 deg advance

point. Of course then someone could exchange mags without realizing the

implications.



 

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