Kawasaki FH430V running rough

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  #1  
Old 07-13-17, 07:27 AM
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Kawasaki FH430V running rough

I've had this 15HP twin since new, is about 12 years old with 1000 hours.

I've had no issues with this engine, oil changes every year, usually twice. Recently it started running a little rich, not so much it would cough or put out black smoke at WOT, but you could smell it as well as hear a little roughness or slight miss.

I did have a bad coil and I just replaced both, along with new NGK plugs, air filter is clean.

It starts right up, but when I advance the throttle to WOT it will puff out a small amount of black smoke.

When I changed the plugs, they had a decent amount of black soot, after the new coils and plugs, it runs better than it did, but still runs slightly rough and is slightly rich.

All input appreciated.
 
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  #2  
Old 07-13-17, 07:47 AM
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Disconnect the kill wires and start it for testing. You'll have to kill it with the choke. If it runs OK you probably have a bad diode in the kill circuit. That allows a cross firing of the coils. That shows up here a lot with the 2 coil setup.

That would be first choice.
 
  #3  
Old 07-13-17, 08:04 AM
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Interesting you say that, when I was testing for the bad coil I noticed the spark was not uniform. Unexpected a steady sequence bit it seemed to jump around In terms of timing.

Would this be a single component to purchase for a fix.
 
  #4  
Old 07-13-17, 09:15 AM
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Could be integrated in the wiring harness or the diode separate. If you go to an IPL it would show it.
 
  #5  
Old 07-13-17, 11:31 AM
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If both plugs looked the same I doubt it is a problem related to spark.
Make sure your choke is adjusted correctly.
If you have a Nikki carb it might be time to kit the o-rings at least.
 
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