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2-3 coil keeps burning up

  • Thread starter Thread starter gs850cafe
  • Start date Start date
G

gs850cafe

Guest
what the hell is causing this? i had some spare coils...they would last about 1000 or so miles an quit..always number 2-3

bike is a 81 850..

has new caps an everything as well
 
"some spare coils" ? suzuki ones- about 4 ohm primary? Is your ignitor surviving this coil torture with no ill effects?
 
tom203 said:
"some spare coils" ? suzuki ones- about 4 ohm primary? Is your ignitor surviving this coil torture with no ill effects?
Click to expand...

yes suzuki coils off another gs850...igniter seems to be fine...i put a spare coil on an off i go with no issues...
 
Wow, this is strange-all the ignitor does is ground out coil- it should have no way to boost extra current thru it . Do you still have a 10 amp ignition fuse?
 
Hi,

I would start by taking off the tank and seat to perform a close visual inspection. Check for worn or melted insulation. Make sure there are no components touching metal. Go over the wiring harness with a fine-toothed comb. Check the resistance on the plug caps.

This has been my "profound glimpse into the obvious" for today. ;)


Thank you for your indulgence,

BassCliff
 
tom203 said:
Wow, this is strange-all the ignitor does is ground out coil- it should have no way to boost extra current thru it . Do you still have a 10 amp ignition fuse?
Click to expand...

ahh that im not sure of..ive just taken them out to clean them..

also clif ive pretty well done what u said..plus the relay mod..

i was so ****ed this mornin i forgot to mention that..

but im glad its no my igniter doing it then
 
ok so apparently my ignition fuse had a 20 amp in it...replaced it with a 10...ill post results if it changes

also its the 3rd or 4th fuse from the top right?(81 850)
 
the only things that might cause a coil to burn would be either

  • you leave the key on so long that the coil over heats and the insulation breaks down causing a short.
  • Or vibration induced failure of the coil insulation
The fuse should not change anything unless it blows then you know there is a potential short in the coil. You could measure the resistance 3-4 ohms .
Also confim the current through a coil is approx:
12V/3ohms=4 amps
or
12V/4ohms=3 amps

Do you smell smoke or burnt material?
 
posplayr said:
the only things that might cause a coil to burn would be either

  • you leave the key on so long that the coil over heats and the insulation breaks down causing a short.
  • Or vibration induced failure of the coil insulation
The fuse should not change anything unless it blows then you know there is a potential short in the coil. You could measure the resistance 3-4 ohms .
Also confim the current through a coil is approx:
12V/3ohms=4 amps
or
12V/4ohms=3 amps

Do you smell smoke or burnt material?
Click to expand...

nope no coils smell burnt..i tested my spares, they were all in check when put on, then when they test out of spec
 
Maybe the terminology is a problem. When you say "burning up" do you mean the coil is melting and leaking wax or that the coil develops an open connection on either the primary or secondary side?
 
no the coil looks fine..

but today i was out of town an it acted up when i hit a bump...im like omg already...so i yanked off my tank on the side of the road to find a bad connector...so off it came an i taped it up an rode it all day with no issues...

can a loose/poor connection ruin a coil?
 
A bad connection is not likely to ruin a coil, but it might convince you the coil is bad. They are just spools of wire sealed in a case, and pretty robust at that. Better coils exist but the GS coils get the job done.
 
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