H mag is giving me fits

Zachary Hoyt · Jul 1, 2010

Thank you Janicholson for your help with my last post. I got a new cap for it as I had gotten rid of the old one a couple of months ago since i thought it might be cracked. I still had the old rotor since it seemed fine. I have tried every permutation of cap and rotor, I tried taking off all the plug wires from the cap except one, still no fire. I am getting good spark from the coil, though. I tried putting my hand on the cap, the coil cap, the wires and the body of the mag and did not get a shock anywhere while holding the starter button down I thought about what you said about the cap and rotor being out of alignment, but I haven't done anything that should have changed them. I tried not putting the rotor on quite all the way to see if that would bring it closer to the contacts, but that didn't help. The contact in both caps looks good, the rotors are complete with tab and everything looks okay. Is it possible to get the tab too close to the contacts in the caps? I will be very grateful for any advice anyone may have. I am at my wits end, not that that is very far away, but still.........
Zach

ChrisNH · Jul 1, 2010

Disconnect the wires to the mag and use and ohm meter to check the resistance across the cap and rotor for each cylinder. You should have pretty low resistance at that point. If that proves OK, my guess would be the points are bad or not properly spaced.

teddy52food · Jul 1, 2010

Take the cap & rotor off then the 2 screws and small cap over the gears & see if they are in time or not. Or send it to me & I can check it out.

Brownie 450 · Jul 1, 2010

Is this a mag with the carbon & spring in the center contact on the cap? Is the spring & carbon there?

Janicholson · Jul 1, 2010

Sorry Chris this will not work (though it seems OK) The rotor tip and the contacts for each tower to the plugs do not touch (ever)as a result the ohm reading will (and must be) infinite. Jim

Janicholson · Jul 1, 2010

Make a card board disk about 2.5" diameter.
in the center make a hole that the rotor shaft will slip through.
Tape this to the mag body so it will not turn.
Put the rotor on.
slowly turn the engine and listen for the mag impulse click. when it does, mark the center of the rotor tip location on the card board. Do this three more times, and you will have an exact location for rotor for the firing of the mag.
Now take the cap and put it up to the cardboard and determine where it is in relation to the marks (line up the screw holes!)
It must point to the plug tower!
I bet this works. Jim

CoopertownBob · Jul 1, 2010

(quoted from post at 20:58:48 07/01/10) Thank you Janicholson for your help with my last post. I got a new cap for it as I had gotten rid of the old one a couple of months ago since i thought it might be cracked. I still had the old rotor since it seemed fine. I have tried every permutation of cap and rotor, I tried taking off all the plug wires from the cap except one, still no fire. I am getting good spark from the coil, though. I tried putting my hand on the cap, the coil cap, the wires and the body of the mag and did not get a shock anywhere while holding the starter button down I thought about what you said about the cap and rotor being out of alignment, but I haven't done anything that should have changed them. I tried not putting the rotor on quite all the way to see if that would bring it closer to the contacts, but that didn't help. The contact in both caps looks good, the rotors are complete with tab and everything looks okay. Is it possible to get the tab too close to the contacts in the caps? I will be very grateful for any advice anyone may have. I am at my wits end, not that that is very far away, but still.........
Zach

Zach,
Didn't you say in a previous post that you had filed the brand new points before installing them? If so, you may have ruined them, so I recommend a new set of points, don't file or stone them, (new ones shouldn't need that anyway), and gap them on .013. Beyond that, pull the mag out and completely rebuild it, all the internal small parts that is, as you already installed a new coil that you know is good. Include a new cap and rotor, condenser, the whole nine yards. And make sure you are being sold the correct stuff, i.e. the stuff for a mag, not a distributor, as they are different.
Keep us posted as to your progress, and good luck!
Bob

ScottyHOMeY · Jul 1, 2010

One stray thought from my feeble and sometimes unreliable memory, but it strikes me the caps (and maybe the rotors, too) are different between the mag and a battery igntion distributor. Do you perchance have the wrong ones?

Janicholson · Jul 1, 2010

Though a noble idea as a last resort, it is making hot blue spark. It just is not being distributed to the plugs. I would not tear it down at all just fix what is broken. the rotor and cap orientation (me thinks) Jim

Anonymous-0 · Jul 1, 2010

MAKE SURE YOUR IMPULSE SPRING IS IN GOOD SHAPE. SHOULD HAVE A GOOD SNAP TO IT WHEN YOU TURN THE COUPLING;

J IN PA

El Toro · Jul 2, 2010

Are you sure you have the correct cap? Check your points to make sure they're opening and closing. Hal

gene bender · Jul 2, 2010

Is the rotor inline with the tower when the mag trips iy must not or your engine would fire and run, Remove the cap and look where the rotor p[oints when the mag impulses rotor must line with the cap so the fire goes to the plug or else the fire will come either too soon or too late as the mag impulses on TDC, You cant get fire to the plug if the rotor isnt lined you correct.

H mag is giving me fits

Zachary Hoyt

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ChrisNH

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teddy52food

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Brownie 450

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Janicholson

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Janicholson

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CoopertownBob

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ScottyHOMeY

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Janicholson

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Anonymous-0

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El Toro

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gene bender

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