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Old 04-21-2009, 08:30 PM   post #1 of 3
ddecart
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Default Kawasaki FH680V Surging & Running Rich

This one has me stumped.

New-to-me mower (Cub Cadet Commercial Tank) with a 23 hp Kawasaki FH680V-BS18, 270 hours

I had a hot start problem, repaired a chafed stator wire, disassembled & cleaned the carb & installed new gaskets, and set the valve lash to 0.004. The hot start problem went away, but now...

At idle, it searches/surges around the set 3600 rpm idle speed
When I engage the blades, it doesn't even want to come up to speed
If it does come up to speed and I try to mow up even a slight hill, it bogs down severely.

Then I realized that it's running incredibly rich! I can't even bear the fumes from this thing when it's running in my shop with the doors open (and I thought my Corvette ran rich at idle!!)

Running at part throttle, it goes like this:
1) rpms drop
2) backfire out exhaust when the rpms bottom out
3) rpms come back up
4) repeat

So somehow, this thing is running incredibly rich, and I now think that's the root of the problem. How does that happen in an engine as incredibly simple as this thing? The carb has a couple jets, no mixture screws, a float and that's about it. I had the carb out, cleaned everything, blew out everything with air, and reassembled with all new gaskets.

This HAS TO be something simple.... UGH!

Thanks in advance for any help!
Dave
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Old 04-30-2009, 06:15 PM   post #2 of 3
rattosh51
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Default Re: Kawasaki FH680V Surging & Running Rich

Sounds like a float adjustment since it's running rich...
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Old 04-30-2009, 09:38 PM   post #3 of 3
ddecart
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Default Re: Kawasaki FH680V Surging & Running Rich

Thanks, but I can happily say nevermind!
As per my other post, it was a coil problem. Thought the unburnt fuel and burning eyes was telling me that it was running way rich, then concluded it was a lean miss, but it just turned out to be a bad coil that wasn't cutting it under load.
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