The trouble you are experiencing could result from several different things. First, check the oil when the engine is cold and completely settled in the sump. You do not want to overfill the engine with oil. If the oil is on the full line (not above it),then the low oil sensor is not shutting off your engine. The oil level should be exactly on the full line-not above or below. Second, remove the spark plug and clean it with a small wire brush or sandpaper. If you are unsure about how to clean the spark plug, replace it with a new one. If both of these procedures have been performed and the mower still doesn't run correctly, the problem is almost certainly with the fuel supply, fuel quality and/or carburetor.
SOURCE: Troy Bilt Self Propelled Lawnmower drive belt
belts usually come off for a few reasons.
They become loose...stretch or the tensioner moves, Make sure that none of the tightening bolds are slipping. You can dab them with a bit of paint.
when the pulleys are not in alignment or crooked or bent. Eyeball the path from one pulley to another, also make sure the tensioner is in alignment and there are no other obstructions.
good, high quality belts are required, and they must be real drive belts...not regular v belts. If there is a way to watch the belt in operation you can usually see what's going wrong.
On my lawnmower I had to grind some metal away where the belt went from the motor to the transmission. Good luck
SOURCE: how do i replace a drive belt on a troy bilt self propelled lawn
You turn the mower over, remove the blade with a 9/16 or 5/8 socket. There is a bolt holding shroud on, 3/8 or 7/16, there are two screws by the rear wheels, 7/16 that need to be removed. Once the shroud is removed, belt can be removed and new one put on.
SOURCE: Troy Bilt 190cc Z-Start Model 12A-446A011 21"Inch Deck
You need to remove a pulley to put the new belt on.
Jim
SOURCE: Troy-Bilt Briggs & Stratton 550 restarting
Troy, Unless you are using old fuel (it breaks down after 1 week) it sounds like you have a faulty spark plug. Replace this first, drain any old fuel and replace with fresh fuel (premium unleaded). A faulty plug will work one minute but then fail like you have described.
SOURCE: Mower won't start - has oil/gas & just used last week
take the air filter off and rub it on your balls
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