Burning up coils

[TGOOD]

Would me having both headlight and tail light tied in with ignition burn my coil up ??
I have a very modified bike with TCI ignition.

 

[TGOOD]

 

[mrtwowheel]

I wouldn't think so, when some of these bikes are wired with a single 20 amp fuse.

Scott

 

[mrtwowheel]

What coil is that again?

You have mounted that in the high vibration zone of the bike. Any place forward of that would be better.

Scott

 

[TGOOD]

Should I have 12.3V on both sides of the coil ?

 

[TGOOD]

I

 

[TGOOD]

Also have 0 resistance from plug wire to plug wire.

 

[mrtwowheel]

That sure looks like the Honda 3 ohm coil that has a terrible reputation.

 

[TGOOD]

Got it from Mike's XS. That coil replaced this coil I think is burned up also .

 

[TwoManyXS1Bs]

The older dual-type coils, at 4.5-5 ohms, will draw about 35 watts of power, similar to a small pencil type soldering iron, and can handle being left "on" for about a minute.

These newer coils, at 1.6-3.5 ohms, will draw much more, and heat up faster.

To get an idea of the power draw, divide voltage (squared) by the coil's resistance.
A 12 volt example: 12 x 12 / 1.6 = 90 watts, a lotta heating power. I wouldn't leave a coil like that powered-up for more than 15 seconds...

 

[TGOOD]

That's the thing , I've never left it no longer than 20-30 sec before kicking it over. And also never kicked over with a plug wire unhooked with key on .

 

[TGOOD]

If even that long .Turn key , pull enricher, kick one time and bike fires up !! Or should I say , fired up .,

 

[TwoManyXS1Bs]

...You have mounted that in the high vibration zone of the bike. Any place forward of that would be better...

That's also a hot spot, behind the engine...

 

[TGOOD]

That's also a hot spot, behind the engine...

So I should definitely relocate coil to under another and above motor .