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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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  #11  
Old 10-30-2016, 01:44 PM
Slogger Slogger is offline
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Default Re: Magneto coil keeps burning out

I don't think the gap is adjustable, except to make sure the iron core is centered up on its four mount screws with clearance all around for the magnet.
Mine doesn't hit but I found some filings in there that mean it does, maybe only at high rpm with the shaft's flexing/thrashing and causing the loss of the gap and a little scuffing.
All I could think of was to make sure its mounted centered on the 4 screws and checked for clearance. I suppose the outer faces of the magnet could be emory clothed for a little more.
I could take off the core, look for the scuffs and adjust it away from there I imagine.

I ride at middle rpms, the gearing won't let it scream, ever. No trouble with the coil or CDIs, maybe high rpm is breaking your wire.

This is an interesting problem.
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Last edited by Slogger; 10-30-2016 at 01:47 PM.
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  #12  
Old 10-30-2016, 03:47 PM
crassius crassius is offline
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Default Re: Magneto coil keeps burning out

filings in there means either that at one time it was off center, or that your main bearing is bad on that side allowing the crank to hop at high revs
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  #13  
Old 10-30-2016, 04:27 PM
Slogger Slogger is offline
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Default Re: Magneto coil keeps burning out

Quote:
Originally Posted by crassius View Post
filings in there means either that at one time it was off center, or that your main bearing is bad on that side allowing the crank to hop at high revs
Pretty much. It doesn't seem to make a noise or hurt anything, so da heck witit.
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  #14  
Old 10-30-2016, 06:51 PM
crassius crassius is offline
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Default Re: Magneto coil keeps burning out

If I didn't see bad movement in main bearing, I might just take armature off and file it out for more clearance - constant tapping there could be shaking your coil until it shorts internally.
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burning up, cdi, coil, magneto, resolder

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