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this can be caused by a weak battery check battery and charging system to verify a good working system. it could also be a weak coil not being able to supply enough output voltage for the ignition system. you don`t say if its weak coming out of the coil or at the plugs. if spark is weak at the plugs it could be a bad cap/rotor, ignition wires. it could also be an ignition module problem or pick-up coil in the distributor.
I see the spool shaft on the spool and not the drive cable. ALL my trimmers were designed for the line spool to come off the shaft (usually by removing the plastic bump feed nut). Your drive shaft appears to have a groove in it about 3/4 toward the top. I surmise that notch is where a broken/missing set screw or "c" clip would most likely hold the shaft to the drive cable. If you find it to be true, a factory part would not ne needed to find a replacement part to lock the shaft and drive cable.
Check to see haw strong the spark is coming out the dist cap. If it is weak there, possible bad cap/rotor/coil/ module. Make sure the wire from the coil to the cap is good.
1) Check for spark remove one of the plugs, connect the plug wire to it and ground spark plug base to a good ground , such as the cylinder head , position the plug so you can see the electrodes , crank the engine over , a fat blue spark should be evident. 2)If the spark is good , check for one or more of the following possible malfunctions 1) Obstructed fuel line or filter.2) leaking head gasket(s)3) low compression. If the spark is not good, check one or more of the following a) Weak ignition coil(s) b) Weak CDI unit. c)Loose electrical connections. d) Dirty electrical connections. e)Loose or broken ignition coil ground wire. f) Broken or shorted high tension lead to the spark plug. Difficulty in starting. Check for fouled spark plugs, Improperly adjusted choke, contaminated fuel system, improperly adjusted carburetor,weak ignition unit,weak ignition coil (s), poor compression
I would first change it over to electronic ignition, you can purchase a kit online.
You did not tell me you changed the spark plug, have you ? Please let me know. www.smallenginewarehouse.com
here are the common causes of a missfire, defective ignition coil or ignition coil wiring for that cylinder, defective fuel injector, defective powertrain control module, intake manifold vacuum leak, low cylinder compression.
Hello . If you have a weak spark it could be the ignition coil that needs adjustment or a bad ignition coil . To find the ignition coil simply follow the spark plug wire . To readjust the coil get a piece of paper , loose the bolts on the coil and put the paper between the coil and the flywheel (higher part of the flywheel or magneto) tight the bolts and remove the paper .
Check for spark . If still a weak spark just replace the ignition coil .
Hope this help.
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