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LT155 Carb Problem

9 years ago

I am posting this for my 86 year old father.

He is puzzled!

His JD LT155 Kohler Engine runs well most of the time, but on occasion, the carb will stick open.

He has worked on small engines for more than 70 years.

He has had the carb apart cleaning it, replaced parts etc.

This problem still randomly reoccurs. He is puzzled and stuck and looking for thoughts he may not be thinking of. So he asked me to type here and ask for any of your ideas! (And BTW, at 86 he is still very clear of mind, and very active, so this is not a senior moment of forgetting or anything)

Any suggestions for me to pass to him?

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Comments (4)

mownie
9 years ago
***" but on occasion, the carb will stick open."***
And when this happens, does the engine race away at very high RPM?
Does this happen at random times when operating the tractor or does it happen only when the engine is first started?
tesmith
Original Author
9 years ago
I am sorry I missed your questions, I was away for Mothers Day weekend and just got back

You asked, " when this happens, does the engine race away at very high RPM?
Does this happen at random times when operating the tractor or does it happen only when the engine is first started?"

It happens at random times.
Revs start to race and then it floods out and dies
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On my 2000 LT 155 there is a condenser, or equivalent. It was replaced by the JD dealer and it solved the problem. I found the manual on the Kohler site. I have a copy if some one would like it. This is from the Kohler Manual: Operation As the flywheel rotates and the magnet assembly moves past the ignition module, a low voltage is induced in the primary windings of the module. When the primary voltage is precisely at its peak, the primary circuit is interrupted, inducing a high voltage in the secondary windings. This high voltage creates a spark at the tip of the spark plug, which ignites the fuel-air mixture in the combustion chamber. The timing of the spark is automatically controlled by the module. Therefore, other than periodically checking/replacing the spark plug, no maintenance, timing, or adjustments are necessary or possible with this system. Measure the resistance of module secondary using an ohmmeter (see Figures 8-2 and 8-4): Zero ohmmeter before testing. Connect one ohmmeter lead to laminations (A). Connect the other lead to the spark plug terminal (C) of high-terminal lead. With the ohmmeter leads connected in this manner, the resistance of secondary should be 7,900 to 18,400 ohms. 4. If the resistance is low or 0 ohms, the module secondary is shorted. Replace the module*. If the resistance is high or infinity ohms, the module secondary is open. Replace the module*. If the resistance is within the specified range, the module secondary is OK.
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tesmith
Original Author
9 years ago
had a person suggest that perhaps somehow the fuel pump is surging sending sporadic higher flow rates.

I am not sure if this could happen, but if it could, I guess it could explain my symptoms.

Any thoughts?
tomplum
9 years ago
The logical solution that I can come up with is that the throttle shaft is worn or possibly the plate is loose on the shaft. These will do either. The wear would be at the top where it turns in carburetor body. I can't visualize a loose control plate causing this but I'd be sure it was tight.

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