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Briggs and stratton backfires and yanks cord

This is a discussion on Briggs and stratton backfires and yanks cord within the Small Engines forums, part of the Tech Support Forum category. I have a lawn mower with a 4hp briggs and stratton that's extremely hard to start and when it does


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Old 06-04-2009, 05:22 PM   #1
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I have a lawn mower with a 4hp briggs and stratton that's extremely hard to start and when it does start it runs real hard also while im trying to start it the engine will back fire and snatch the cord out of my hand. It acks like its out of time, is that possible. I removed the head and the piston and valves appear to be in sync as far as the intake, compression, power, and exhaust sequence is concerned and the valves aint cracked. any suggestions. this problem started when I hit a piece of tree root

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Old 06-04-2009, 08:57 PM   #2
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Hi and welcome to the forum

Pretty sure that this the problem:

http://outdoorpowerinfo.com/repairs/flywheel_key.asp

BG

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Old 11-15-2009, 09:36 PM   #3
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briggs backfires and yanks cord

yes i agree the flywheel key has been sheared and ignition is out of time
this will cause the unit to kick back and ripp cord out of your hand

cheers mst pops
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Old 11-16-2009, 05:43 PM   #4
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Is the blade tight?
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