I have a Lawnboy 10730, with a Kohler XT650 engine. Five years old. Seems to have developed hydro-lock, whereby I can't pull the starting cord. I remove the spark plug, and I can pull the cord fine fine (though nothing comes out of the plug hole - I would have expected some oil to shoot out). I replace the spark plug, and I can't pull the cord again. What's the fix???
hydro-lock in a Kohler
- Thread starter Danl99
- Start date
If nothing comes out the cylinder with the spark plug out, I’d be looking at the valves. Remove the spark plug and valve cover. While rotating the flywheel by hand watch the valves to confirm they are opening. Let us know what you find.
No, it pulls easily with the plug removed.
Well, that's depressing. After getting it started, and letting it run smoothly for 15 minutes, when I try to start it back up, the hydra-lock is still there. You'd think that running it for a while would clear out any problem, but that's evidently not the case.
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- Feb 19, 2020
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Does not sound hydrolock as the term indicates there must be a liquid involved. It more likely a mechanical failure such as the ignition being loose, engine brake not releasing, or internal problem.
BTW BDC is Bottom Dead Center and TDC is Top Dead Center. Both refers to the piston position.
As for the rod you would inserting it thru the plug hole to find where the piston is sitting in the cylinder.
BTW BDC is Bottom Dead Center and TDC is Top Dead Center. Both refers to the piston position.
As for the rod you would inserting it thru the plug hole to find where the piston is sitting in the cylinder.
But, as I said, I was able to get it to run, and it ran smoothly for 15 minutes. You'd think a mechanical failure wouldn't come and go, and specifically go away when I pull the spark plug. Tried that several times. Spark plug in, CAN'T pull cord. Spark plug out, CAN pull cord.