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  #11  
Old 05-29-2015, 11:17 PM
pjm123a pjm123a is offline
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Join Date: Jul 2008
Location: FL
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I have a different model Kawi engine (FH601V) on a Scag Zero Turn Mower. I had what seems to be the same problem you are having. Tried different things to fix it and was able to make improvements using some of the things that have already been suggested in this thread. In the end replacing the coils was what fixed it for me. It still starts and runs great hot or cold. You can read about it here:

http://www.lawnsite.com/showthread.php?t=406070

Good luck and I hope this helps you out.
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  #12  
Old 05-30-2015, 01:58 AM
herler herler is offline
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Join Date: Apr 2012
Posts: 5,146
Quote:
Originally Posted by dunaway.jesse@gmail.com View Post
Choke is closing fully. No corrosion in boots. Got it to run last night after a lot of cranking. Ran it 5 minutes shut it off. Would NOT start back up
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Spark plug gap gone wide.
What you describe is a typical symptom of spark plug gap erosion.

Over time spark plug gaps erode, causing the gap to grow wider, usually the process takes some years but the time limit is real.
For example in a car, I believe the erosion is .005" per every 10,000 miles or so.
Every time a spark plug fires, a teenie bit equivalent to some millionths of an inch of steel disappear from the electrode forever.
Thus over millions of crankshaft revolutions, the gap slowly but continually grows wider.

It is quite easy for spark plugs that were set to .030 to grow to .035 and later to .040...
Usually "hard" starts begin around .045"

When's the last time you checked the gaps?
Anytime a plug is pulled, the gap needs to be checked.
They should be set to .030 (thou setting them to .025 extends the re-gapping service interval).

Last edited by herler; 05-30-2015 at 02:04 AM.
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