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Old 01-06-2015, 12:51 PM
cboudet cboudet is offline
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Location: florida
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kawasaki 23 HP engine does not start when warm

Hi there,
I am posting this hoping one of you has come across this before and I can avoid a repair bill.
I have a kawasaki 23 HP FH680V that runs flawlessly, starts fine when cold, but if it warms up and I have to turn it off, I cannot get it to start again until it cools down.
Let me clarify that the engine is not overheating. I can run it for hours without any problem, but I cannot start it if it is warmed up.
I have changed plugs, coils, carburetor, voltage regulator nd still does the same thing.
Weird right?
Thanks in advance for any help.
CB
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Old 01-06-2015, 02:46 PM
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ilike2mow ilike2mow is offline
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Sounds like the carburetor solenoid is going bad. But that would have been replaced with the carburetor?
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Old 01-06-2015, 05:11 PM
laman laman is offline
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I had that problem like that with my 680v. I changed both coils and have not had that problem since..
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Old 01-06-2015, 06:14 PM
dooweb2 dooweb2 is offline
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Head gasket leak possibly
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  #5  
Old 01-06-2015, 06:58 PM
herler herler is online now
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If this is a water-cooled engine, my first suspicion would be the thermostat.
It's either sticking or too hot a temperature range.
Replace with a cooler range one (like 160F).

That having been said...
If it won't restart until it's cooled down the exhaust valve (and/or valve seat) may be the problem. If you can remove and disassemble the engine yourself, this isn't expensive to have corrected. If not, the shop labor for tear-down and reassembly will be fairly costly. A common reason for exhaust valve failure is that grass clippings become embedded in the cooling fins around the exhaust port area.

Source:
http://www.repairfaq.org/samnew/lmfaq/lmedwrwh.htm
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Old 01-06-2015, 07:27 PM
sjessen sjessen is online now
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Quote:
Originally Posted by herler View Post
If this is a water-cooled engine, my first suspicion would be the thermostat.
It's either sticking or too hot a temperature range.
Replace with a cooler range one (like 160F).

That having been said...
If it won't restart until it's cooled down the exhaust valve (and/or valve seat) may be the problem. If you can remove and disassemble the engine yourself, this isn't expensive to have corrected. If not, the shop labor for tear-down and reassembly will be fairly costly. A common reason for exhaust valve failure is that grass clippings become embedded in the cooling fins around the exhaust port area.

Source:
http://www.repairfaq.org/samnew/lmfaq/lmedwrwh.htm
This engine is air cooled. If it were a valve issue would not the problem manifest itself at all times and not just when hot?

That said kiwi's are known for heat related issues.

To the op, is the dipstick really dark? If so, that might indicate overheating.
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Old 01-06-2015, 08:14 PM
dooweb2 dooweb2 is offline
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I had the same symptoms on an air cooled.twin. started when cold mowed when I shut it off would crank forever but no start until cooled. I thought foe sure carb problems but nope head gasket leaked
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  #8  
Old 01-06-2015, 09:54 PM
cboudet cboudet is offline
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Quote:
Originally Posted by ilike2mow View Post
Sounds like the carburetor solenoid is going bad. But that would have been replaced with the carburetor?
And I did not replace that!
I will let you know.
Thanks!
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Old 01-06-2015, 10:01 PM
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Patriot Services Patriot Services is online now
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The plastic dipstick do turn dark normally or running hot. Pull the shroud and see if oil and grass have built up. The breather is under the flywheel and sometimes loosens making a mess. The top shaft seal can leak. Before that make sure the fuel pump isn't marginal and vapor locking. Check the fuel line routing near hot spots. A hand held IR temp gun from harbor freight helps pinpoint hot spots. Also check the gas cap for malfunctioning valve.
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  #10  
Old 01-06-2015, 10:01 PM
cboudet cboudet is offline
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Join Date: Apr 2013
Location: florida
Posts: 16
Quote:
Originally Posted by herler View Post
If this is a water-cooled engine, my first suspicion would be the thermostat.
It's either sticking or too hot a temperature range.
Replace with a cooler range one (like 160F).

That having been said...
If it won't restart until it's cooled down the exhaust valve (and/or valve seat) may be the problem. If you can remove and disassemble the engine yourself, this isn't expensive to have corrected. If not, the shop labor for tear-down and reassembly will be fairly costly. A common reason for exhaust valve failure is that grass clippings become embedded in the cooling fins around the exhaust port area.

Source:
http://www.repairfaq.org/samnew/lmfaq/lmedwrwh.htm
Thanks for the info. It is an air cooled engine. I will check as much as I can.
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