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Pull your spark plug to ensure it isn't a compression issue or even piston/rod damage. If it still doesn't move, pull off your starter assembly and try to rotate the fly wheel by hand. If it turns, then your issue is in your recoil spring kit. You can replace the unit, or try to disassemble and reassemble.
In front of the handle on top of the saw is a hand guard. If in the course of cutting wood you hit it or pushed it forward, it will lock up the chain drive system. It should pull back towards the handle until it again clicks to release the chain. It's designed to lock up the chain drive and stop the chain when the saw kicks back.
Remove the cover on the right hand side of the saw and remove the bar and chain. Clean the oil port holes in the bar and the body of the saw. They get clogged with sawdust and chips. Also clean the groove in the bar and the sprocket at the end of the bar. Always use proper chainsaw bar oil.
there is a broken gear in the gear reduction box. (explain:) the motor spins at a high rpm, the chain moves at a 1/4 or less rpm than the motor. a series of gears reduces the speed, which in turn creates torque, allowing the saw to have the force to keep cutting without stopping. One of the gears is broken or a keyway on a shaft is sheared...as far as i know, no electrical power tools are rebuildable. it's a safety thing (electric shock if reassembled wrong...they are priced for replacement...get a new one...
1. The kickback brake, if equipped, was triggered to stop the chain. 2. The chain is jammed with saw dust/debris (it doesn't take much) 3. the bar sprocket is damaged. 4. The chain guide teeth are damaged and not sliding through the bar guide groove smoothly 5. The chain is adjusted too tightly. 6. You are out of bar oil and friction has stopped it/damaged the bar and/or chain 7. The motor sprocket clutch is damaged.
From the Makita manual: If the saw does not start when the ON/OFF switch (1) is actuated, it will be necessary to release the chain brake. - Pull the hand guard (6) firmly in the direction of the arrow until you feel it catch. electric motor does not function no power supply cable defective chain brake actuated Mains fuse blown HTH Lou If these don't work return it, maybe it is defective. Test the new one in the store.
Sounds like the sprocket could be stripped. If so, then you would need to replace the sproket. I suggest you contact Master Parts at 800-466-1446 or online at www.masterparts.net. They may be able to help you.