lb 10655 has no compression

17 years ago

Hello all, I have a 3 year old lawnboy #10655 gold series lawnmower. Yesterday my daughter was cutting the grass, the mower popped and died. she could not get restarted. I came home and checked the spark. At first i could not see any spark on the plug. Eventually i saw spark at the plug. I put my finger tip in the plug hole and had my brother pull the cord. No compression. The piston goes up and down. the valves are going up and down. I put the spark plug back in and gave it a shot of starting fluid and it won't fire. Does anyone have any ideas as to the problem or what to look at? thanks all.

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Comments (6)

tomplum
17 years ago
Perchance did the valve cover get hit and dented? My first step would be to sneak the cover off and take a look up top anyways.
aliasmax
Original Author
17 years ago
I did remove the valve cover and everything was normal. nothing broken and valves moving up and down. thanks for the reply
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1saxman
17 years ago
'The piston goes up and down. the valves are going up and down'

Those are the main factors and rule out most major problems. This engine may have compression release for easy starting. I'm not sure how it works on the Honda, but maybe it's stuck.
tomplum
17 years ago
"I did remove the valve cover and everything was normal. nothing broken and valves moving up and down." What we are looking for is are the the valves actually closing. Excessive looseness in the rocker would be an indication of a loose valve seat or more likely debris between the valve and seat. This is provided there isn't an adjuster problem. No clearance at the rocker won't allow the valve to shut either. I've seen these valves stick, so make sure they are moving freely. That is normally due to old fuel deposits on valves after the engine has been sitting for a while however. Popping sound is peculiar. ..
aliasmax
Original Author
17 years ago
I found the problem. My daughter must of hit the swing with the valve cover. It was dented in just enough to not let a valve close. Pounded out the valve cover, reinstalled it and it fired right up. Thank you for the replies.
1saxman
17 years ago
You can order a cast aluminum cover that comes on the GSV 190 commercial engine and it's a direct swap. Even with the cast aluminum cover, the Lawn-Boy commercial mower has a steel rod brush guard in front of the engine.

Here is a link that might be useful: {{gwi:141485}}