Kawasaki FC420V back- fires thru carb on cold starts,will eventually start and starts and runs fine there after. Engine has been overhauled,carb was cleaned and checked,did we miss something?
It sounds like your valves may need to be adjusted...
if they are too lose or worn they won't seat properly and when the engine fires it blows back through the intake valve.
pull the cover and see if the rockers are loose... it only takes one to give you a headache.
SOURCE: Engine misses bad when running above half
Check out http://www.aa1car.com/library/cm1196.htm. You must first identify the type of fouling which is occurring. Examine the chart and compare it to your fouled spark plug. Look up the cause which will direct you to the solution.
:o)
SOURCE: I have a j.d. 345 lawn tractor with 20 h.p.
It sounds like you have a stuck valve on the carb. I recommend taking the carb off, taking it apart and cleaning everything well with carb cleaner. When you remove the lower bulb on the carb there will be a float valve inside. Check the tiny needle valve for any residue. If it still looks bad (the valve) after cleaning you may need to replace it.
Usually a good cleaning once every year or two will take care of any carb problems.
unplug the engine harness and then check for spark if you have spark its a bad safety switch
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