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Posted by Mike Dobony on August 31, 2006, 10:04 pm
> Let's look for simpler problems::
>
> 1. Spark plug -- clean and regap, or replace.
>
?????????????????? A bump will affect this? I doubt it!
> 2. Air filter -- clean or replace
Done first thing I got it. Also tried removing the filter. No change.
>
> 3. Carburetor -- clean, check float for sticking.
A possibility, especially if the previous owner used ethanol.
>
> 4. Water in fuel tank from winter? Drain, put in fresh fuel.
Already done and how would this explain the sudden rough running after
bumping the mower?
>
> A valve problem (4 cycle only) would possibly cause backfire. However,
> carbon buildup could also be a culprit. Pull head, and clean, but you
> will likely need to replace the head gasket, and you need a torque
> wrench to put it back on correctly. Torque sequence of bolts is
> important..
>
Wouldn't it always run bad then? That doesn't explain how a bump would
cause it to suddenly run rough and stall and then start up again and run
fine.
> If there is a gear problem, it shouldn't run at all, I would think.
>
Yea, but it explains the backfiring and it would still run if it was only
off 1 tooth.
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