Pull start tries to pull my arm out of it's socket

carpespasm

Forum Newbie
Joined
Nov 6, 2012
Threads
1
Messages
5
  • / Pull start tries to pull my arm out of it's socket
Hi all, Sorry if this has been addressed somewhere else, I wasn't sure how to search for this particular problem. I got a Briggs and Stratton 6hp 12V802 on a lawnboy mower the other day and while trying to get it back running I'm hitting a snag. Replaced the air filter, air intake manifold (was cracked in two), cleaned the carb, and put fresh gas in.

The engine spins freely and will even run (but poorly) once in every dozen or so pulls for a few seconds, but about 1/3 of pulls result in what seems like either the engine trying to spin backwards or it trying to pull my shoulder out of it's socket very abruptly about 1/2 way through the pull. I've never come across this before but after replacing the pawl teeth and retaining piece in the pull starter it's still doing this and I think it ?might? have something to do with the engine not running as it should. That or this mower has gremlins.

Any ideas?
 

Parkmower

Well-Known Member
Joined
Jun 7, 2011
Threads
23
Messages
891
  • / Pull start tries to pull my arm out of it's socket
Sound like a broken flywheel key. Not hard to check and or replace.
 

carpespasm

Forum Newbie
Joined
Nov 6, 2012
Threads
1
Messages
5
  • / Pull start tries to pull my arm out of it's socket
And that would be able to make the engine try to go backward like that? From the spark timing being off I assume?
 

carpespasm

Forum Newbie
Joined
Nov 6, 2012
Threads
1
Messages
5
  • / Pull start tries to pull my arm out of it's socket
Yep, it's sheared. I've tried the prybar and hammer on the flywheel nut method of pulling the flywheel, but it really seems wedged in place. Any suggestions for gettng it off?
 

Parkmower

Well-Known Member
Joined
Jun 7, 2011
Threads
23
Messages
891
  • / Pull start tries to pull my arm out of it's socket
Yes. I've repaired many with your symptoms. Usually end up elbow in my gut from pulling.
 

Parkmower

Well-Known Member
Joined
Jun 7, 2011
Threads
23
Messages
891
  • / Pull start tries to pull my arm out of it's socket
Either a puller or hammer on the nut with prybar applying up pressure. Looking for shock hit so one solid whack usually does it.
 

SeniorCitizen

Lawn Addict
Joined
Aug 28, 2010
Threads
123
Messages
2,075
  • / Pull start tries to pull my arm out of it's socket
If you are using a 16 ounce hammer put it back so you can find it to drive nails. To remove flywheels using the hammer method a 3 lb. hammer will work with a sharp smack but I like a 8 lb. sledge hammer squarely dropped from about a foot .

Flush the nut with the shaft end and use a nail bar etc. to just raise the shaft the thrust distance . Since we aren't trying to pry the flywheel off but are just lifting the shaft and flywheel, about 5 pounds pressure on the end of the bar is plenty .
 

Parkmower

Well-Known Member
Joined
Jun 7, 2011
Threads
23
Messages
891
  • / Pull start tries to pull my arm out of it's socket
SandburRanch said:
If you are using a 16 ounce hammer put it back so you can find it to drive nails. To remove flywheels using the hammer method a 3 lb. hammer will work with a sharp smack but I like a 8 lb. sledge hammer squarely dropped from about a foot .

Flush the nut with the shaft end and use a nail bar etc. to just raise the shaft the thrust distance . Since we aren't trying to pry the flywheel off but are just lifting the shaft and flywheel, about 5 pounds pressure on the end of the bar is plenty .

Thanks. Didn't feel like typing all that.
 

chance123

Well-Known Member
Joined
Aug 14, 2012
Threads
11
Messages
824
  • / Pull start tries to pull my arm out of it's socket
I agree with the sheared FW key, but if by chance it is "not" sheared, check your valve clearences. I have found some briggs tend to pull back due to "too much" play in the valve adjustments and not allowing the compression release to operate.
 

carpespasm

Forum Newbie
Joined
Nov 6, 2012
Threads
1
Messages
5
  • / Pull start tries to pull my arm out of it's socket
Thanks guys! I've went ahead and borrowed a gear puller from a buddy of mine. I'm headed off to get a new key for it now. Damn thing jumped about 3" off the shaft when it finally gave way. It was offset about 1/4 turn around the shaft from where it shouldhave been.
 
Top