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Shrieking Lawnmower!! I hit small tree branch w/ walking non-drive 3.75 hp Briggs and Scrap-Iron "Sprint" off-brand gas mower. Started shrieking like banshee. Resulted in tangled pull-cord. So I removed pullcord housing and re-wound pull cord. Now, upon re-start, ran ok initially, until I encountered first bit of grass---now shrieking continually before encountering resistance, runs out of balance a bit, and upon engine kill I observe slight loss of tension on pullcord. So it must be, what, a belt? and/or the upper pullcord rewind assembly is involved somehow? Central shaft involved I suppose--it'd be nice if someone tells me what I should look for and/or best steps for teardown. thanks a million!!!!

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Sounds like you have dirt in the recoil clutch, (under the screen) or you bent something there. try removing the clutch and make sure shaft is very clean and lightly coated with oil. This would be for a briggs and stratton engine.

Posted on Jul 25, 2009

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http://www.ehow.com/video_2328977_how-install-lawn-mower-starter.html

and how to tension the spring:
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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

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