Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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Hard starting smokes white like gas is getting into cylinders

Hard to start if engine stops on top of compression stroke acts like gas on piston when it starts it'll smoke white than stops last time used had a miss under a load new plug oil filter cleaned

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White smoke in a small engine is oil. Oil in the cylinder will create too much pressure for the engine to achieve compression. Make sure the engine is not getting fuel into the oil and thinning the mixture (literally smell the oil... gasoline and oil smell nothing alike, if it smells like gas, it is). If this is the case, the carb is leaking fuel into the engine, thinning the oil and causing the oil to leak past the rings into the cylinder head, through the valves and, from there, into the exhaust to burn off. Black smoke indicates a direct fuel issue in a small engine, white is oil based.

Posted on Mar 14, 2009

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Posted on Jan 02, 2017

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White smoke:

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Sounds like there is unburnt fuel. Could be a spark plug that's burnt out and therefore just flooding a cylinder. Which would push out fuel through the exhaust valve on the exhaust stroke. So once the fuel hits the inside of the exhaust manifold, it burns white, as if you're boiling it off. That one cylinder could have a damaged compression ring on the piston, so the fuel is bypassing it and going into the oil.

I would have your engine tuned up, and check the compressions on the cylinders.

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I have a 1998 Monte carlo z34 with a 3.8. changed the fuel pump, thermostat, fuel and air filter, and intake manifold gasket because of dissappearing anitfreeze and it was running rough.and having...


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if its firing 180 out you need to make sure when you set the timing its on the compression . when the piston is at the very top of the stroke The first one is the Intake stroke, the piston moves down the cylinder while the intake valve is open. Once the piston reaches the bottom of the intake stroke the intake valve closes. The next stroke is the Compression stroke, during this stroke all valves are closed and the piston moves back to the top of the cylinder compressing the air fuel mixture. Once the piston reaches the top you are starting the ignition stroke. With the piston at the top the spark plug fires igniting the compressed air fuel mixture forcing the piston back to the bottom of the cylinder. Once it reaches the bottom you begin the Exhaust stroke. The exhaust valves opens allowing the piston to rotate back to the top pushing out the burnt gases.

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Have a B&S, Vanguard, 23HP motor, model 386777 with 300hrs on it. Motor starts and runs fairly well, but a fair amount of smoke is being emitted from air intake. Very evident with air cleaner removed....


sounds like you have a bad set of rings on one cylinder,or a bad valve set.
the stronger compression cylinder will burn richer due to the fact that the lower compression cylinder isnt pulling a hard enough vacumme to draw in all the fuel that is dumped into the intake.when the good cylinder makes it intake stroke it pulls in the excess fuel and a fresh amount from the carb.

im leaning more towards the valve train on the bad cylinder due to the white smoke comming from the carb,if the intake valve isnt seating properly,you will have compression escaping,back feeding through the intake.but yoy should hear a popping along with the smoke,everytime the engine fires that cylinder.
hope this info helps you.

4 stroke
#1 intake stroke
exhaust valve closed,intake valve open.as the piston is on its way to the bottom of the bore,it creates a vacumme.drawing in the air/fuel mixture from the carb.when the piston hits the bottom of its downward travel,the intake valve closes,then the next stroke comes into play.

#2 compression stroke
after drawing in the air fuel mixture,the intake and exhaust valve are both closed.the rotating momentium pushes the piston back up the cylinder,compressing the air/fuel into the cylinder.

#3 power stroke
(depending on the timing)when the cylinder reaches top dead center (tdc)in the bore.the spark plug ignites the fuel,which causes the air/fuel mix explode.that explosion forces the piston back down into the bore.when the piston travels down,this stroke is completed.

#4 exhaust stroke
after the power stroke,the piston then travels back up the bore,while opening the exhaust valve.the moving pistion then pushes the exhausted air through the exhaust chamber and out the muffler.

then the cycle starts over again.
so if you have a valve thats not seating properly,on compression stroke you will have loss of compression,on the power stroke,loss of power....forcing that ignited fuel back through the valve that isnt seated corectly(if intake) you will get white smoke and a poping sound from the carb.on the exhaust stroke it will sent exhausted air back through the intake aswell.

once again i hope this helps,id dig into the valve train on that cylinder.

nick

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