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Lawn Tractor Engine-Start Problems

I have a Briggs & Stratton Engine 5BSXS-5012 VP on a Sears LT-1000 Lawn Tractor. It's almost 4 years old, and runs like a top after I get it started.
My problem is that it no longer starts like it used to. I even bought a new battery with the same CCA Rating as the original battery that came on the tractor which worked perfectly each and every time. Now, I have to manually rotate the Engine-Shaft guard to relieve pressure on the cylinders. (At least that's what I think is happening) After doing this, the engine usually starts with help from a battery charger. This is the 3rd battery (New) that I've tried; so I don't think the problem is the battery.
What could have happened to the engine over the last year or so that causes it to be more difficult to start ? I change the oil and filters twice per year, and the oil still looks new to me.
Thank You !

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I don't think it's the starter motor. This bigger engine has a compression release which allows it to crank with the compression released below a certtian rotational speed. This gizmo can hang up and not release if the engine sits for a long time etc.. What is supposed to happen is that the release stays effective until the starter can spin it up to speed before compression kicks in.

Posted on May 03, 2008

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Ed, I think that when all is said and done you will find that you have a defective STARTER MOTOR. If the BATTERY is at full Charge, and it takes a Battery Charger added to the Battery in order to get enough current to turn over and Start the Motor. I suspect the Starter Motor is defective.
I also have Sears Tractors with Briggs, three of them.
Also clean your Spark Plug when you service the Engine.
Good Luck!

Posted on Feb 03, 2008


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