QuestionHi Eric,
This is my third response to the surging problem.
To date I have cleaned the carb twice with compressed air and carb cleaner, replaced or removed and sealed all carb gaskets with an automotive quality liquid gasket sealer, replaced the gas filter, replaced the air filter, replaced the spark plug, checked all lines, etc. I still have the *&^%&%$ surging.
What can I do next?
Thanks.
Larry
PRIOR CORRESPONDENCE BELOW...
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Your question was
"In your last response, you advised to:
1) check and clean the valve breather
A - I do not find a valve breather on this engine. Are you sure it has one? Where is it?
2) asked if the engine was mechanical or vaccumm fuel pump
A - The fuel is fed through a single gravity line directly into the carb and bowl. It is free of obstructions. No mechanical pump or vaccumm line.
3) Have I replaced the spark plug?
A - Yes, I replaced the plug. No difference in surging.
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Followup To
Question -
I have a 2001/2 Scott riding mower with a 16 hp Kohler "Command" engine. It ran fine the first year but is now surging continually when running. From prior posts, I noted that the carb could be the problem; so I disassembled it and cleaned it. It appeared very clean. No help.
In summary the engine:
- starts fine on chock.
- when taken off chock, the engine speed rises and falls coninually on about 5 second cycles.
- when I engage the blade too fast, the engine almost dies; if I hit a heavy spot in the lawn, the engine almost dies.
- If I am running for a longer period under heavy load, the surging lessens or stops.
- if I hold the governor manually be hand, the engine runs fine (no surging) but I cannot do that while mowing of course.
- the surging occurs at all speeds but is worse at higher speeds.
- I note that the governor lever is very loose and moves very freely -- should that not be damped?
I don't have a trailer to transport this pig to a repair shop, so any help that you can give will be greatly appreciated.
Thanks!
Answer -
Some governors are dampened but most are not. More than likely the problem is in the carburetor. Did you used an air compressor to blow out all the carburetor orfices?
Check the carburetor and intake gaskets. If either of these leak it will surge.
Let me know about the carb cleaning.
Eric";
and was asked on 1/16/05
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AnswerSurging problems are the most difficult to fix.
The next step we do at the shop is to check the engine RMP with a digital or analog single/twin cylinder tachometer.
If the engine RPM needs adjusting then we adjust it to the correct RPM. If the unit still surges then we replace the governor spring and reajust the engine RPM. If that does not fix the surging on Kohlers we get out the manometer and measure the crankcase vacuum. If the vacuum is within specifications, the ignition system is timed, the engine RPM is correctly set, the governor spring replaced, and the gaskets sealing then we replace the carburetor.
Do you have access to a small engine tachometer and manometer?
Let me know.
Eric
