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If the plug is wet with fuel and it is firing then pull the muffler and for a struck ring. Struck and bad score cylinders will cause one not to start as you need at least 100 psi of compression to ignite the fuel mix.
These are okay then check the ignition of the flywheel to coil relationship as it could be a sheared flywheel key. Note most 2 cycles are now using cast in key as part of the flywheel itself.
you sheared the flywheel key... If it's a PB250 251 or something along those lines you are going to need a new carb and flywheel. Take it to the dealer and see if they can fix in under warranty... Why the carb you say, it leaked causing the flywheel to come loose. If it's not under warranty then do not repair, you can buy a new one for about $160 USD
the other possibilities you have is a bad crank seal, or a flywheel came loose and its out of time, will it fire on carb cleaner sprayed in the carb, If it runs for seconds and , then I would say it's not getting fuel, If it only farts once or twice then I would check crank seals cause if they are leaking then your crankcase cannot draw vacumn which in turn causes fuel pump in carb to draw fuel, If you have to check flywheel pull it apart and take flywheel nut off and pull flywheel off and inspect the key that is built into flywheel to see if it is sheared off or messed up, also while checking muffler check for the opening that the mud dobbers havent put mud in muffler pipe, good luck
is your spark plug getting wet from fuel? try take air snorkel off carb and give it a shot of carb cleaner if it fires you have a fuel problem if it doesent fire , and plug is wet pull plug and rollover and get excess fuel out of cylinder, and try carb cleaner again, if no luck check compression, then if good go to flywheel and see if loose
If there is a good spark and there is good fuel at the plug the only reason it wont fire or do somthing is if the ignition timing is out, this can happen if the alloy flywheel key has sheard, remove the flywheel and check, unfortunatly if the key has gone it is a new flywheel.
check compresstion first if good.then check for fire if good then spray little startfluide in carb if ti starts rebuild carb if it dont start you have problem in blower some where like fire sparkplug timing on flywheel key take flywheel off check key.make sure kill switch wire is not shorting out somewhere.make sure magnet on flywheel is good.let me know if this helps you ok
most of the time there is a air leak in one of the two crank shaft seals.to get to them you need to pull off the flywheel and the clutch assy.look for wet areas. that will be where the seal is letting out the oil and air.If you keep putting starting fluid in the carburator you will burn the rings,the piston and the cylinder up
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