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white smoke usually indicates excess oil consumption. make sure you can turn motor over by hand you should feel resistance when the piston is on the compression stroke ensure ignition is off to do this test. no ressistance would indicate low compression and possible cracked or broken piston ring or. worn piston rings. Test by putting a small amount of oil into combustion chamber the oil will temporarily help seal off the piston rings and result in more compression indicating worn rings.also oil filler breather cap blow by would indicate this as well hope this helps.
yes make sure the open ends do not line up, stagger them in 3rd's oil well before you put the piston in the ring compressor. Make sure you have the piston "Front mark" orientated properly before instalation.
I am not a mechanic per say but usually that black smoke is oil blowing by the piston rings if it is black smoke which means it needs a overhaul and keep plenty of oil handy. However if it is white smoke it is a rich carborator and you need to redo the adjustment on the carb for air to gas ratio (screws on the side of the carb bowl) just play with it and one last ting make sure the plug is properly gapped having a too close a gap can cause it also
Your piston is worn and galled, you might be able to do a rebuild with a new piston and rings and hone the cylinder, but please always consider cost, of the price of a new engine,if you cannot do the work yourself,
Mowers smoke for the following reasons:
Too much oil.
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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