Chainsaw blade moving with pullcord - Husqvarna Chain Saw 20" Bar

Hello, here is website to help you with replacement.
Pull Cord Repair On Stihl MS250 Chainsaw

the chain guard is pushed forward.

I know that the starter assembly for Craftsman 316.350840 [ The 316 means it was made by MTD] this saw became became no longer available. But you can use this model number 41AY80AG983 [Remington also made by MTD] and get the same part (exception being that it will be Orange, instead of Black). Part number 753-06974
http://www.searspartsdirect.com/partsdirect/part-model/Mtd-Parts/Chainsaw-Parts/Model-41AY80AG983/0736/1503220/1303082P/00002?blt=06&prst=0&shdMod=41AY80AG983

try going on youtube and you could find a video that shows you how. youtube .com and type in the search box: mcculoch chain saw repair videos

but the model number on sears parts online and look at there pictures

Are you asking something, or telling someone to replace a pullcord on a chainsaw?

take it to a local small power shop,its not an easy task,takes them 2 minutes

The chuck may just be sticking. Remove the front housing with the large screw, tap the chuck with a hammer & pin, and lube.

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.