Question about Briggs & Stratton Power Products 5,550 Watt Portable Generator #30241

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Flywheel keeps sheering the key after about 5 seconds of run time

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Is the flywheel torqued right?? about 25 ft/lbs?

Posted on May 12, 2013

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The bearings on the alternator, or the end bearing on the engine, is likely seized. Engine tries to overcome, but ends up shearing the key. You might also be using the wrong replacement key as well.

Posted on Jun 12, 2010

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1 Answer

I have a 6.75 Briggs and Stratton that always started on first pull. It is 5 yrs old. Started and mowed front stopped it and it will not fire again only pops through the carb. it has fuel. Plug is ok


popping through the carburetor if a sign it is out of time. the flywheel key has sheered. remove the cover on the top of the engine. take the nut off the flywheel and see if the two grooves are lined up with the key. if not replace the key and it will be good.

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1 Answer

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1 Answer

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This is not a dryer question. A flywheel that has spun and sheered the keyway will require re machining. There is supposed to be in interference fit between the flywheel and the shaft and the key only helps retain the position. The key is soft to allow for serious trauma, but if the flywheel spins by much, it will fit too loose.

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2 Answers

My son hit a log with my js25 walk behind mower now it won't run.


He more than likely sheered the key in the crankshaft. When the key bends or breaks it throws the timing off and the engine will not start. The key is there to prevent damage to the crankshaft when you hit an object. You will need to remove the engine cover and then use a puller to remove the flywheel. Where the flywheel connects to the crankshaft you will see the key which is either broken or bent. All you do is buy a new one and replace it.

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