Question about RTO Lawn Boy 6.75hp Mower

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1982 Lawnboy smokes. Correct fuel oil mixrture 32-1. Exhuast ports clean. New plug and air filter. Could it be carb problems or worn rings. Thanks Roger

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Worn crankshaft seals (look for black goo around the upper seal under the flywheel and lower shaft seal). Bottom seal is common and easy to fix... cheap, too!

Stuck/saturated carburetor float or bad float needle

Faulty primer bulb circuit (try disconnecting the small tube to se if the smoke stops)

Weak spark (should be a fat white spark that you can hear) or incorrect gap

Partially sheared flywheel key from insufficient flywheel nut torque (rare, but it happens, especially after do-it-yourselfer tune-ups)

Posted on Jun 09, 2010

  • goggomobil Jun 09, 2010

    Re-read the question... yes, worn rings can do this but usually will also exhibit hard starting and loss of power when mowing tall/thick grass.

    If the new air filter seems to be constantly wet with fuel, it may be the reed valves.


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White smoke or grey smoke ?

Posted on Jun 07, 2010

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Blower would not run at anything above 1/2 throttle. then it would not start at all. put a carb kit in and not it starts and runs at higher rpms but when it warms up it dies. when snapping the throttle it...


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Also clean the air filter... this can have similar effects on start/run.

Pull the spark plug and clean it also, you can use spray carb cleaner on the tip, and then clean with fine sandpaper.
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Use a piece of corn-broom NEVER anything else !!! and poke the hole(S) to make sure they are clear.
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Mower starting but smoking heavily, just topped off oil in Toro


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Badly clogged air filter can cause oil to be sucked by piston rings.
Worn piston rings.
Worn cylinder walls.
Cracked block/piston.
Excessive blow-by getting sucked into carb. Caused by worn rings.
The only thing most people can fix is the too much oil or clogged air filter. Try those first.

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