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could be several things. take plug out and hook up to plug wire hold it to the metal on the engine pull the rope. if it has fire you can eliminate coil. clean plug and put back in. take off air filter and spray a shot of carburetor cleaner in the opening of the carburetor. if it starts and dies you have a dirty carburetor that needs cleaned. if it don't you may have a compression problem.
take the fuel line off at the carburetor. if fuel is coming out then you have a plugged carburetor. take it off and apart. clean it really good with carburetor cleaner and put in a new needle and seat. it should run as good as new.
Take air cleaner off. Shoot some spray carburetor cleaner in the carburetor and try to start Try this a few times to see if the engine will fire.. If it fires or starts then there is a fuel delivery problem. Could be a dirty fuel filter, bad (stale) gas, a dirty carburetor. If it does not start with the carb cleaner, check the spark plug. It may be fouled. Check for spark - take plug out of head. with the plug attached to plug wire, hold plug with a pair of insulated pliers, and touch outside of plug where the threads are to the engine, while some one pulls on the start cord. You should get a bluish spark. If you get a weak spark use a new plug and try again. There should be a bluish spark. Make sure you hold the plug against the engine making good contact. If no spark at all, could a bad magneto.
Getting back to the carburetor. If you think the gas in the tank is stale, drain it out and put fresh gas in the tank. Change the gas filter.
The arburator may be cleaned by pouring a 1/2 can of fuel system cleaner in the gas tank and spraying the spray cleaner down the carburetor throat.
Sounds like a sheer flywheel key. Common on the SRC 621. Kawasaki motor, correct. The flywheel key is under the recoil. Pull the flywheel and check the key. A very small key is there. Breaks and puts the engine out of time
You can try buy a new spark plug and replace it with the old one. I had the same problem! You just have to keep pulling until it catches! Or maybe it's the carburetor that needs to be replaced! I had the same problem wih my scooter. I just changed the carburetor and it worked fine :)
first try and start it with carb cleaner or starting fluid with the air filter out if it fires then its a carb/fuel problem if not it could be a spark problem remove the plug connect hte wire back up and crank the engine over while looking for spark if no spark disconnect the kill switch wires from the side of the engine should be a single wire near the throttle cable if spark with that off the problem is in the wiring or safety switch if still no spark its the coil
first things first: 1) make sure that the kill for the magneto/coil is breaking contact( it is on the side of the mower,follow the cable down from the red bar) 2) gas to carburetor 3) spark to plug/s 4) gas to cylinder/s
pull plug and try starting mower, observe spark plug for spark and fuel coming out of cylinder/s. if spark no gas, then check to see if it getting to the carburetor, if it is then it is the float and seat in the carburetor and will need to be cleaned/replaced/rebuilt. Or just simple pour gas into the carburetor and try starting if it starts then it is the fuel line, carburetor. Hope this helped Tim
Try looking at the screw that holds the bowl in place, sometimes they have a little orifice on them that gets clogged and hinder fuel from reaching carb. Use a small pin or small gauge wire to clean. Good Luck...
Is it getting fire to the plug, and is it a good blue flame. is the flame arcing between the electrode only. if not your plug could be fuel fouled. if it is fuel fouled toss it and get a new one. the wood ref key on the fly wheel may be bent . if it is bent it will throw it out of time. hope this helps