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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...
If it wont pull you probably have ceased the piston in some way. You can get access to the piston by removing the exhaust baffle. Or disassembling the entire saw.
Try putting a screw driver in where the exhaust and trying to move the piston just a little bit, back and forth. Once thats done, use a heavier gas / oil mixture.
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