Testing a GS750E Coil

[Guest]

No Spark on 1 and 4, how do I test the coil with a Multimeter?

I'm not much of a sparky

Help would be appreciated!
Thanks

[tom203]

The ignition coil has a primary circuit that should measure about 3 to 5 ohms across the terminals. The secondary circuit ( the spark plug wires) will measure maybe 12000 ohms plug wire to plug wire with plug caps removed-easier to test coils this way since cap corrosion interfers with reading. see step 10 in this link

http://members.dslextreme.com/users/storagecliff/images/electrical_odd-n-ends.html#A17

[lemonshindig]

Here's a thread where we isolated an ignition problem down to a faulty coil:

http://www.thegsresources.com/_forum/showthread.php?t=214069

It is generally much more likely that you have bad points, a bad ignitor, a wiring problem, or bad spark plug caps. Coils rarely fail, although they do sometimes, as seen in that thread.

[BigD_83]

Coils rarely fail, although they do sometimes, as seen in that thread.

rarely, true. I once melted the heck out of a coil when I inadvertently left the key in the ON position for a day and a half. There was a stream of "wax" from the coil dripping down onto the engine...

[GateKeeper]

I had a coil go bad, well actually only half a coil, very strange....

so I got some new/old coils and bike has been running just fine ever since....

They can go bad, even half of one....

have a look here

http://www.thegsresources.com/_forum/showthread.php?t=210023

and you can start around post 91 if you don't want to go through the whole thing

.

[Crank]

Thanks for all of the info gents, done some reading and printed out a wiring diagram.

Realized that my multimeter's 9v battery is dead last night so can only give some feedback when its sorted.

Cheers
Scott

[MisterCinders]

After testing the resistance across the 2 primary and 2 secondary leads, check resistance across the primary and secondary leads.

You should get 3 ohms between the o/w and the black wire, about 30k ohms between the plug wires and infinite resistance between the input lead and the plug wire. If the reading shows any resistance from input to plug wire (even 200k ohms), the coil has a short.

AMHIK