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Take the spark plug and connect the plug wire to top like it is supposed to be. With plug out of machine rest base of plug against metal of head (anywhere on motor near plug hole) and try pulling fast and look at gap in plug for spark. You have to make sure base is getting good ground to motor but if system working you should see a spark. If not you need to first check for small black wires that come from coil and go to throttle linkage point, or other "kill" switch to make sure the wire did not come off and is touching something. Some machines have a few ways to kill motor with the small wires (like a dead man switch on mower) that need to be checked for possible issue. If the kill systems seem to be working then coil is probably gone. To change coil you have to take engine covers off and pull flywheel to get at coil. You need a wheel puller to take flywheel off. If you have the tools it is not hard but if no tools it is tough.
could be a number if things, dirty carb, old gas, dirty coil contacts, low combustion chamber pressure, (bad rings), bad spark plug. First try replacing the spark plug and if it is old gas remove and replace with fresh. if that doesn't do it then the carb needs to be removed, cleaned and blown out thoroughly with an air compressor. reassemble and reinstall. next is to remove the recoil housing and clean the coil contacts. the coil is attached to the spark plug wire. remove and with some old gas or wd-40 and a wire brush, remove dirt and rust from contacts as well as magnet on the flywheel. be sure to leave the proper gap between the coil and flywheel when you replace the coil. If you can pull the recoil with your forefinger and thumb, chances are your machine is toast and needs a ring job. good luck
Sounds like you may have a bad spark plug or coil..first remove the plug wire from the one not firing..using a rubber handled pliers hold the plug wire close to the plug tip or any metal part of the motor..and crank engine if you see a spark it most likely is the plug..pull the plug out and place the wire back on and do the same thing holding the plug close to the metal, if no spark change the plug..if none coil is bad..just follow the plug wire back to its beginning..the coil. It is attached by two bolts or screws,,check and see if they are tight and there is space between the coil and the flywheel..if it is loose or no space reset the clearance by using a business card as a gauge between the coil and flywheel and retighten and check for spark..If everything iis tight and clearance is ok..remove the coil and replace with a new..use the business card as a gauge...good luck.
Remove the small bolts that hold top cover on . Remove small bolts that hold down ignition coil unplug the spark plug wire. Set the coil out of the way. Remove the nut from the center of the flywheel. Use a steering wheel puller to remove the flywheel. Install the new flywheel over shafts key tap center of new flywheel on the shaft . Keep eye on the key that the flywheel doesn't push out of the shaft . Install nut and get it tight.gap coil with a business card between coil and flywheel as you tightening bolts plug in spark plug wire . Reinstall top cover.
Lawmowers have a coil mounted along side the flywheel. You have to remove pull cord assembly, then remove flywheel nut. now the coil is exposed. most of the time rust on the flywheel is the only problem. Clean with 120 grit sandpaper. Loosen the coil screws so the coil can move in and out, then palce a match-pak carboard flap between the flywheel and the coil and snug down the screws. you should be all set. Now make certain to check the flywheel key to see if it is bent or broken. These keys are made of soft metal to protect the crankshaft from being damaged. So replace the key if damaged or broken. This should solve your problem. To test the coil you either need a ampmeter, or you can pull the cord while holding sparkplug wire 1/2 inch from engine bolt and look fo spark while pulling the rope. Good luck. Don't forget to remove the matchbook from the flywheel after setting gap, which is .010 thousands of an inch.
The magneto is by the flywheel. Depending on the age, there maybe points under the flywheel. If so you remove the flywheel and there the points are. Sometimes bugs build cacoons between points, make them inoperable. Newer engines have electronic ignition though. Follow the small wire from the magneto coil ( where the spark plug wire goes) it will either go under the flywheel through a plastic bushing, or to an electronic module. The magneto coils do fail you can test with an ohm meter. Before that test for spark. You can remove the spark plug, and let it rest on the engine to get ground, and turn the engine over. You always need 1-spark, 2 fuel . If you have spark, see if it will hit on starting fluid, if it does, then you have a carb or fuel filter issue. Those shut off valves on the bottom of those tanks, can be a problem
Hi, There is a shutdown wire, this wire is grounded somewhere along the route. Look at the coil for this wire; it shorts the coil to ground so no spark can get out to the plug. Let us know if you want to know something else accept the suggestion. Thanks for contacting fixya.com
Chain saws are still two-cycle engines (gas and oil mix) and they foul the spark plug pretty rapidly if not in perfect tune. Remove the spark plug and re-attach the wire and let the plug contact any metal part such as the cylinder head. Make sure the gas petcock is off and the start switch is on. Pull on the recoil starter and see if you have a spark jumping from the center electrode of the plug to the outer electrode of the plug. Clean and re-gap the plug and try it again. If no spark, the center electrode could be broken up inside the ceramic insulator and you can't see it. Try a new plug. If still no spark, another component of the simple electrical system could be bad. If your saw has a capacitor, change that out also. Sometimes the small coil that rides very close to the magnets on the flywheel comes out of adjustment. Proper gap for that is a small piece cut from a cereal box and placed between the coil and flywheel while re-tightening the coil bolts. Do not let the coil scrape on the flywheel. If any of this has helped, please rate accordingly. Good luck.