OT - lawn mower engine prioblem

Aug 13, 2006 1 Replies

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Bob Engelhardt 20 years ago

I have a 12 hp B&S engine on a 52" mower. The other day I had been mowing for about 1/2 an hour when

there was a sharp "pop" (not as loud as a backfire).
The mower slowed (some loss of power). Over the next 5 - 10 minutes
there was a couple of "backfires" (not through carb) and
it continued to lose power.

I stopped and let it sit a day or so. When I restarted it

it pulled more easily than normal (?) (recoil start). It ran pretty much normally for 10 - 15 minutes, although somewhat slower (?). Then I was finished.

What happened?

Valve? Head gasket? (I don't hear any puffing when I turn it over.)

Thanks, Bob

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Bob Engelhardt 20 years ago

I removed the head. The gasket was fine, as were the valves. As to the valves being fine - I mean that they open and close smoothly, are tight when closed, and show no signs of being burned.

I'll check the valves clearance when I get a chance.

Bob

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