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Re: [Shop-talk] Rock 1, Mower 0 ?

Subject: Re: [Shop-talk] Rock 1, Mower 0 ?
From: Pat Horne <>
Date: Mon, 20 May 2013 08:49:47 -0500
References: <83A969DFA3194574BDC5424F73A2F105@EricJRussellPC>
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Thusly spake Eric J Russell

Years ago I did the same with a B&S mower. The end of the crank where 
the blade attached had about 1/8" run out, so I figured the engine was 
toast. Just for grins I tried to straighten the crank by using a 
suitable pipe to bend it back onto line. It worked, and I used that 
mower for several years until I moved and didn't take it with me. I know 
it can be unsafe, but it worked and didn't cost anything!

Running the engine without the blade doesn't always work because the 
blade acts as a flywheel. Running without the blade makes the engine 
speed changes faster than the governor can respond. This might be what's 
happening when the engine doesn't rev correctly. You might be able to 
hold the throttle linkage between the governor and the carb so that it 
revs up more.


> Hit a large rock the lawn mower. (Briggs & Stratton engine in a Craftsman push
> mower) Bent the blade & sheared the key in the 'blade adapter'. The flywheel
> key is intact. With the blade & spark plug removed I can manually turn the
> engine but it feels like there are two unequally spaced tight areas with each
> revolution. The engine will run but it knocks & doesn't run at full speed.
> It is old enough that I don't want to bother wasting money on it (like a new
> blade adapter & blade) if it is likely fatally damaged. I assume the blade has
> some balancing/flywheel affect but shouldn't the engine manually rotate 360
> degrees smoothly without the blade?
> Ideas?
> Eric Russell
> Mebane, NC
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Pat Horne, Owner, Horne Systems
(512) 797-7501 Voice & Text     5026 FM 2001  Lockhart, TX 78644-4443
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