Kohler sv735 running rich blowing black smoke. Left and right wires have spark but when I pull right plug wire there is no change in engine sputtering and knocking. No metal in oil. Pull the left and it dies. Backfire when turning off. Thought I saw a yellow spark from back of motor when I started it once from around the starter area but not anywhere where I could see any wireing. At one point after I pulled the right wire off and started the motor a red wire on the right side tied wrapped to the plastic intake manifold arcked from one side of the connector to the other but when I put the plug wire back on it did not arc any more. Any ideas?
Tring to bring it back after sitting in the weather for about 2 years. Courage only has 130 hours on it.
what tractor is it on?
Definately sounds like you have some electrical gremlins. The backfiring when you shut it off could be due to bad gas/bad adjusted carb. If it is too rich (or has weak spark too) the cylinder had undurbed gas in it when you shut the motor off, and it loads up the exhaust and ignites- BOOM! backfire - my buddies JD with a 16 single cyl Kohler does it all the time
