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A few days ago I was happily mowing and all of a suddon I heard a klunk klunk and the engine stopped and now it won't start. It turns out that I hit a small stump, no bigger than a 1" diameter.

Seems to me I have heard that some engines have a shear pin to prevent major damage.

My engine is a B&S 128M05-0026-F1 Can someone tell me what to do next. I think I have the skills and tools to play DIY.

Thanks, Jim

Yes it has a flywheel shear key.

Thanks, I got one yesterday at the local lawn equipment store. They didn’t stock the flywheel puller so I’m fabricating one. I tried all the screws in my junk fastener bucket but no luck. Do you happen to know the thread size of the flywheel puller holes? I can just go to the hardware store and buy two of each likely size.

Most likely if the the flywheel never been off then you need self tapping 1/4" screws. If tapped already it can either 1/4" or 6 mm.

StarTech said:

Most likely if the the flywheel never been off then you need self tapping 1/4" screws. If tapped already it can either 1/4" or 6 mm.

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I had a few M6's and an M6 bottoming tap so I went that way. It worked out great and I was mowing again yesterday. As soon as the mower was running, I got out my reciprocating saw and chopped down that stump.

Thanks for the help. Regards, Jim

okrobie said:

I had a few M6's and an M6 bottoming tap so I went that way. It worked out great and I was mowing again yesterday. As soon as the mower was running, I got out my reciprocating saw and chopped down that stump.

Thanks for the help. Regards, Jim

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Glad to hear she is running.

Old timers used to walk the yard prior to mowing. You can ask yourself why if you like.