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1989 Kawasaki Bayou 300 Ignition Coil Killer


bigd764

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Oh, by the way, it has a new battery, spark plug, Cdi, and regulator-rectifier.

6 minutes ago, bigd764 said:

I have a 1989 Bayou 300 and  i have to keep replacing the ignition coil on it. Does anyone know what might cause this ? It runs great for a few weeks and then it just stops firing and won't start back until the coil is replaced. I have put 3 new coils on it already.

 

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The wrong coils ? CDI systems have to have a coil made for them, not one made for the old 12 volt systems.

A bad earth or, if it has two wires, reverse connected.. 

Bad mounting, either distorting it, overheating it, or vibrating it too much.. All long shots because they are normally pretty tough.

Edited by Mech
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The replacement coil was much smaller in size than the original. I had to drill holes in the mounting plate to get it to bolt up. It's mounted securely and i don't think vibration is the issue. It has two wires and i am not 100% sure they are reverse connected. I took a look at the service manual and it said the bike would run with the wires either way without changing performance. The original coil was marked with positive and negative terminals but the replacement was not.

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On 2/20/2023 at 10:55 AM, Gwbarm said:

Just had another bad aftermarket coil out of the box, it wasn't completely bad but specs were not what they were supposed to be for my machine. 

I tried testing the resistance on the coil. Could you tell me what the specs are supposed to be?

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As for having the coil either way around..  That's not so. The primary and the secondary windings both attach to the same internal earth. If it's connected the wrong way around the HT instead of earthing straight to that internal earth, has to go through the primary windings to get to earth..  That HT burns through the insulation on the windings.

It has to have the internal earth end of the primary windings going to earth..

Edited by Mech
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55 minutes ago, Mech said:

As for having the coil either way around..  That's not so. The primary and the secondary windings both attach to the same internal earth. If it's connected the wrong way around the HT instead of earthing straight to that internal earth, has to go through the primary windings to get to earth..  That HT burns through the insulation on the windings.

It has to have the internal earth end of the primary windings going to earth..

Since the new coil doesn't have the + and - terminals marked,how do i determine which one is which?

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Yeah, that's the tricky part.. haha.  In the old 12v systems there was more resistance in the primary windings and you could tell which was which with an ohm gauge. The cdi coils have so little primary resistance in the primary that it would need a very accurate ohm gauge, or an oscilloscope..

I don't know how you are going to tell the difference, but I'll bet that's the problem..  That or a bad earth which has much the same effect on the coil..

If all three of the coils you've had have been aftermarket, perhaps it's time to invest in a genuine item.. If some of them have been genuine yamaha, then check the earths.

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