H4 I/H Magneto

Leonard Dacus · Sep 25, 2012

Magneto on U2A power unit not firing. it is H4 I/H magneto,is there a way to check condensor with a multimeter to see if it is ok. unit was running, was going to shut down accidently touched hot wire from battery to screw on side of megneto has not run since.any help would be appreciated.

Bob M · Sep 25, 2012

Several possibilities caused by an accidental contact with the battery:

1 - Breaker point contacts got burned. Try dressing with a point file then resetting the point gap to 0.013.

2 - Coil primary has been fried. Check with an ohmmeter: A good coil will show a few tenths of an ohm between the breaker points insulated contact and ground with the points open. If the meter shows open circuit it's time for a new coil.

3 - The magneto magnet became demagnetized. Repair is best left to a good magneto rebuilder.

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As for testing a condenser, disconnect the wire from the condenser to the breaker points. Now take you ohmmeter, set it to it's highest scale then take a reading between the condenser's lead and case. A good condenser should initially show relatively low resistance which gradually increases over several seconds to several megohms.

If the meter shows infinite resistance (open) or 0 ohms (short circuit) the condenser is no good.

El Toro · Sep 26, 2012

I would replace the condenser. Touch those magnets with a flatblade screwdriver to see if they will attract that screwdriver with a lot of effort. If they appear to be ok and there's no fire with the new condenser you probably fried the coil. Hal

H4 I/H Magneto

Leonard Dacus

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Bob M

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El Toro

Well-known Member

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