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Garden Tractors / Mowers / Scooters Vintage lawn and garden tractors, mowers, snowmobiles and other old machinery that is driven by small air cooled engines.

Garden Tractors / Mowers / Scooters

Briggs and Stratton Model N That Smokes. What's the fix...


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  #1  
Old 01-12-2018, 03:54:21 PM
R Davis R Davis is offline
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Default Briggs and Stratton Model N That Smokes. What's the fix...

I've tried getting a Model N that doesn't smoke the easy way, by buying one, but I own 3 now and still don't have one.

The strongest of the 3 is on my David Bradley 57561. It smokes a 'little' all the time, but really pours out the blue smoke for a minute or better when it's first started. So oil's getting in the cylinder after it's shut off... I guess. I can't figure how the oil would get in there.

My question is, will honing the cylinder and going to an oversized piston fix it? And what else might be wrong, worn valve guides maybe? I've read about what can happen with a sticking or faulty crankcase vent, so replaced mine with a NOS that's never been used. It helped, but the motor's still an oil burner...

Any suggestions? I won't be tearing the motor apart 'til warm weather gets here, but it'd be nice to find out if it can even be fixed before I start buying pistons, cylinder hones and headache medicine... lol
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Old 01-12-2018, 06:41:44 PM
Thaumaturge Thaumaturge is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

Clean (rinse out) crankcase breather....
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Old 01-12-2018, 07:36:18 PM
G.M.Johnson G.M.Johnson is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

If the motors have been run hard and never really had a proper oil change it can be just worn out rings and/or scored or worn cylinder. There is also a possibility that the oil return holes in the piston oil ring groove are blocked or plugged! I've seen a few that where that way and the oil has no way to drain back. Just another possibility.
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Old 01-12-2018, 09:01:44 PM
R Davis R Davis is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

Thaumaturge... replaced the original crankcase breather with a 'new old stock' breather still in the box. It helped, but not enough.

G.M.Johnson... what you're saying makes sense. I've got a 2nd Model N sitting on the shelf that smokes worse than the one I'm using, but will fire right up. That'll probably be the motor I tackle first, thanks for the help...
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Old 01-13-2018, 07:17:18 AM
R Davis R Davis is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

Akuna... I was wondering the same thing, but with the way the motor's built, any oil leaking past the valve guides would end up back in the crankcase.
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Old 01-13-2018, 02:00:49 PM
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

Too much oil in oil bath air cleaner?
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Old 01-13-2018, 06:08:49 PM
R Davis R Davis is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

Back inside after pulling the air cleaner and breather tube. Inside the tube and carb didn't have any oil, they were pretty much dry. The oil bath air cleaner was a tad low on oil, just below the full line.

When I'm plowing snow with the tractor, once I've pushed the snow up to the pile, I'll keep right on pushing with the tractor and drop the handle bar. Sometimes the handlebar will go all the way to the ground while the plow raises up to pile the snow higher. That would probably tip the air cleaner enough to spill a little oil, but doesn't seem like it'd be a problem.

It seems like what G.M. Johnson says about the oil return holes in the piston oil ring groove being blocked or plugged is probably what's going on. I'm still open for more suggestions though, we've got more snow forecast for later in the week and I can't tear the motor down just yet. I was going to wait 'til spring, but probably shouldn't let this thread die without getting an answer to what's wrong...
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Old 01-13-2018, 07:58:18 PM
R Davis R Davis is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

I do. I'll take the motor I'm describing off the tractor and put one of the other motors on. They act a little different, the one that's going on smokes all the time...lol

I'll take the motor apart that's on the tractor, look at the piston and rings, then get on here and let you know what I find.

It'll be a few days, but I'll report back.

And thanks for the help...
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Old 01-14-2018, 12:32:58 AM
gdstew gdstew is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

The only real way to know is to take it apart and look at it. I'm guessing it has a worn out bore, worn out rings, and probably an undersize crankshaft. Could be opening up a real can of worms!
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Old 01-14-2018, 07:32:58 AM
R Davis R Davis is offline
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Default Re: Briggs and Stratton Model N that smokes. What's the fix...

gdstew... I hope you're wrong about the can of worms. In hindsight, I probably should have waited 'til I was ready to work on the motor before asking a question here.

Now that've started this thread, I really ought to take it far enough to answer the question I asked. These discussions do come up in Google searches, so I feel like I owe it to the owner of this site to finish what I started.

One way or the other, I'll eventually have a decent model N powering the tractor, so tearing this motor down was going to happen sooner or later...

I appreciate your post though, you might be right...lol
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