Firing on 1 cylinder only GSX250

[GSXjeff]

Hi
I own a 2004 GSX 250 which is firing on 1 cyclinder intermittently. I have elimenated the igniter,coils, spark plugs, eletrical connections as the problem and have traced it back to perhaps one of the coils at the magento but dont know how to test. any ideas??

[FROSTY:Me]

eassy way--swap em over one to the other--if the problem swaps then there ya go

[GSXjeff]

done that, any other ideas are they tested by voltage or ohms??

[wildpudding]

Sounds similiar to a problem I had on my impulse. One of the trigger coils was stuffed.

Find the wire that goes from the CDI to the engine, should have 3 wires. I'm not an expert on your bike, but on mine it had a common wire(wire that goes to both coils), and the other 2 went to each individual coil. To test if there is an open circuit, measure the resistance between the common wire, and one of the other wires. If you get a reading of infinity, then there is a open circuit and one of the trigger coils is stufffed.

Stefan

[GSXjeff]

Cheers that has solved the problem, just waiting on bits to arrive then I will be able to ride again.

[wildpudding]

No worries mate, I was pretty happy when we worked that out on my bike too!