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425 won't start when cold

Ed K My model 245 w/ 14 hp Kawasaki will start and run all summer long, until the weather starts to turn cold in October / November. It turns over and just backfires through the exhaust - but will not start. Replaced ignition module. Any ideas? Local JD dealer has given up.
Henry How many hours on the engine? Has it been doing this for awhile?
Dale G. Basgall Ed, regarding the Kawasaki engine, those engines are set so lean for the ratio of fuel to air that if there is any slight deviation in that fuel to air mixture they will not start. I mean less than 10% in the lean state.

Jahn Deere dealer can sell you an accessory main jet that takes care of that problem, it did for mine. Backfiring out the exhaust however could possibly be another problem , thats unusual unless there is a exhaust valve seating problem also, however if the unit runs well after it's warmed up and running then I believe your problem could be solved with the mainjet , I think it's a 105 I have in mine.

What happens usually when it gets cold the air dencity changes, this actually contracts the calculated volume of air entering the intake on a cold day and then upon expansion of the air into the venturi of the carburetor makes the fuel to air mixture leaner than calculated.

Try changing to the other size main jet it works much better.

Dale



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