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Buell Motorcycle Forum » Quick Board Archives » Archive through September 15, 2008 » Lawn mower engine help... « Previous Next »

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Xl1200r
Posted on Friday, September 12, 2008 - 09:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Okay - won't bore you all with the details.

Brother bought a new house, came with a riding lawn mower which turned out to not start. It had been sitting for about 2 years.

I took a look at it. Went to drain the oil and it was mostly gas. I'm guessing the carb just bled into the chamber and it slowly worked its way past the rings.

Anyways, flushed the crankcase and refilled with oil.

I also replaced the spark plug.

It fired up on the second pull, but there are some issues. The chamber is also full of oil somehow - there is a TON of smoke when it runs, and it is literally blowing liquid oil out the muffler.

On top of it, even with the throttle set to low, the thing wants to keep revving.

So, I need advice on what I feel are my two options at this point:

1) Start the thing up, keep the choke on to control the revs and just let it clear itself out, which will also hopefully fix the revving issue (I'm thinking the chamber has a LOT of gas/oil mix sitting in it...)

2) Take the head off the thing and drain it, wipe it down, put it together.

Unless of course, I'm missing something.

Oh - it's a Briggs and Stratton 9hp "Power Built" vertical shaft, no electric start if that helps anyone.
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Mr_grumpy
Posted on Friday, September 12, 2008 - 10:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Sounds like the rings are stuck & it's blowing by.

First thing I'd do is stand it on end so that the cylinder is vertical & fire a load of redex or similar down the plug hole, let it stand to soak a day or so, then try it again, it'll smoke like a bstrd but run it til it's good & hot, & all the smoke's cleared then, oil change.

best of luck.
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Thumper74
Posted on Friday, September 12, 2008 - 11:28 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I’m with Grumpy here, sounds like the rings are stuck from sitting so long. My Mustang does it after long periods. De like he said, stand it so the piston is vertical and put something with detergent in it like Sea Foam or ATF and let it sit for a day or two. The benefit of Sea Foam is that put a few teaspoons in the cylinder, put some in the gas and it’ll help out both. If it’s been sitting for so long, I’d go through the fuel system and rebuild the carb, change the fuel filter/strainer and flush the tank. Lawn mower carbs are pretty crude and easy to work on… Worse case scenario you may need to put some new rings in there, but that also gives you the ability to hop it up a little bit!
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Frankfast
Posted on Friday, September 12, 2008 - 11:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I had to put a manual gas shutoff on mine to keep the gas out of the chamber. The electric shutoff at the float bowl doesn't work and because of gravity feed, gas bleeds into the cylinder when it's sitting.
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Xl1200r
Posted on Friday, September 12, 2008 - 01:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Explain the rings sticking thing... it doesn't make sense to me.

The engine moves freely, nothing feels "stuck".
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Thumper74
Posted on Friday, September 12, 2008 - 02:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The rings (outward tension on the cylinder wall)can stick in the ring lands in the piston allowing them to not expand to the size of the bore at the top of the stroke (where the bore generally gets bigger due to wear). It’s usually caused by varnish, excessive carbon, etc. The rings literally can’t expand to seal against the cylinder walls.
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Xl1200r
Posted on Friday, September 12, 2008 - 03:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Ah, got it - stuck to the piston, not the cylinder.

So, would there be any harm in trying to run the crud out for a bit and see if the smoke goes away before sitting the thing on it's side?

I also think maybe the breather needs to be cleaned out.
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Mr_grumpy
Posted on Friday, September 12, 2008 - 04:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Worst case scenario is it seizes, but it didn't cost you anything so there's no real loss side to the equation.
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Thumper74
Posted on Friday, September 12, 2008 - 04:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

A plugged crankcase vent could also cause the same situation... The vapors can't get out and need to go someplace. They'll force themselves past the rings... I say clean out the vent and try a can of SeaFoam or any top end cleaner
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Natexlh1000
Posted on Friday, September 12, 2008 - 05:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Try this:


x
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Tramp
Posted on Friday, September 12, 2008 - 05:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I've got a brand new briggs diamond power 6 HP VS that will work, you can have it for $50-
I live about an hour and 40 minu6tes south of you, Newburgh exit off the Thruway...I'll even meet you near the exit

frankly, I think the mill you have will be fine- just add some marvel to the crankcase,crank it a bit, start it and run for a minute if it'll start....then pull the plug, invert it overnight to drain it (through the head plug hole) turn it back over in the am, add the correct amount of oil and start the bee-hotch.

IF still an issue, you know where a nice briggs is.

(Message edited by tramp on September 12, 2008)
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Xl1200r
Posted on Friday, September 12, 2008 - 09:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

So basically it sounds like everyone thinks I should dump something in there to soak the rings. Then that's what I'll do.
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Bcordb3
Posted on Friday, September 12, 2008 - 10:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Marvel Mystery Oil works wonders. I don't why, but it does.
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Gbr
Posted on Saturday, September 13, 2008 - 12:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Your revving issue could be the governor is not working correctly. Depends on the type, but the air vane type have a spring that has to be tensioned correctly, and if its sat for a while like that one it may not be right. All in all, those are pretty simple engines, and for about 20 bucks you can get a Briggs shop manual that will tell you just about everything you need to rebuild them.
gbr
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