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2006 Suzuki King Quad 300 Fowling Plug


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  • Admin changed the title to 2006 Suzuki King Quad 300 Fowling Plug


  • 2 months later...


 Is there any blow back at filter(popping, backfiring, coughing, spitting fuel back etc?)?. If There is you need to check valve clearances to make sure they are correct. You then need to clean the carburetor. The second thing to check is the ignition system.
I have run upon the following that causes the plugs to fowl out.
1. Bad fuel system or carburetor. Example had a Honda fowling plugs, coughing with reduced power and otherwise ran ok. I replaced the carb and it still did same thing and worse. So I took old carb apart cleaned it and adjusted it by the manual. I put it back on and machine ran good. So do not think because you buy a new carb it will always be a good one, especially these after market carbs.
2. Valves. I had one machine that backfired when you let off the accelerator, fowled out the plugs etc. The valves were to tight causing this.
3. Ignition system. Coils, CDI modules and ignition stators can be bad causing the plug not to fire hot enough. This will cause plug fowling. Had a running machine with a CDI module that was bad causing it to run a while then it would get hard to start. I removed plug and it was partially fowled out(it was still firing but not 100% so it was hard starting. I also had a machine that had a resistive ground that caused the ignition not to fire hot enough.
4. Engine cylinder compression. If the cylinder compression is low it will also cause plug fowling.

There is many many thing that can cause plug fowling.
Hope this info helps you find your problem. 
There is in the service manuals a troubleshooting guide that will help you locate the probable cause. I suggest you get a service manual and read it. Even though I am familiar with ATVs I always get a service manual when the problem is more then just a bad switch or lose wire.

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