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No compression when I pull the cord on my lawnmower Briggs and Stratton. What do I look for and how do I fix it?

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There could be a whole bunch of things to cause this, from a badly worn engine to just a valve stuck open, a dealer could do a leakdown test on the engine and give a more definate reason for the problem, or you could remove the cylinder head ( side valve engine ) and check the valves are opening whilst turning the engine.

Posted on Aug 03, 2013

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Posted on Jan 02, 2017

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SOURCE: My lawnmower pull cord is stuck. I cannot start my

Need to replace pull cord

Posted on Apr 23, 2011

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I have a Briggs & Stratton Sprint 3.75 hp lawnmower and it seems the cord is pulled almost all the way out and won't retract. How will i know if it is broken? or should I be able to wind it back up...


You should be able to Fix this yourself if your a fair garage tinkering mechanic. However...I need the engine and type number off of the engine to get you parts information. The spring is broken in your recoil. It is a matter of removing the air shroud, taking off the pulley / spool and changing the spring.
http://www.ehow.com/video_2328977_how-install-lawn-mower-starter.html

and how to tension the spring:
http://www.ehow.com/video_2328961_how-tension-lawn-mower-starter.html

There are 2 different types of springs used so having your engine model / type number is important so that you can get the right spring. One of the 2 part numbers is: 390066

Thanks for choosing FixYa,
Kelly

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1 Answer

Pull cord wont pull,briggs 500 series


Pull the spark plug out and see if it isnt hydro locked. Someone might have overfilled the oil or the carb float may have stuck open and filled the intake with gas!

If the recoil is still stuck you can remove it from the mower and try it without any load on it. Still stuck? The unit might be rusted solid!
You can spray a little penetrating oil into it but be careful.....the oil will soak the pull cord which should be cleaned and degreased immediately following using the penetrating oil.

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