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Loosen the bar mount nuts about 1 turn, locate the tension-er screw next to the chainsaw's bar and while holding the bar up turn the screw clockwise until the chain is properly tensioned. while still holding the bar up, tighten the bar mount nuts, test the chain for proper tension. It should not be too tight, you should be able to rotate chain by hand, nor too loose where the chain's drive link's are hanging down below the bar's groove on the bottom side.
all oil tanks on chain saws take Bar/chain oil this can be bought same place u buy 2 cycle engine oil most times , this bar chain oil most times is a 30W oil , if you change weights of oil then oil pump is not gonna add proper amount of oil to saw in use ,this will cause u problems !
1st add fuel/oil mix to fuel tank , then top off oil tank with bar oil , place saw down on flat surface , press 'ON" button above trigger handle to ON (its marked on case) then pull out blue choke handle till it clicks and stays out , press primer bulb with thumb 8 to 10 times bulb will become harder to press as it fills carb , push chain brake forward (on) ` place left hand on top of saw and right hand on start cord , hold saw down firmly and pull cord vigorsly several times till it sort of starts (sound) , squeeze trigger in and pull cord once more , saw should take off running , chain wont move ,walk to wood pile then disengage the chain brake and cut wood , if saw fails to start after this procedure then there must be a fault in saw , consult a exp small engine dealer for repairs
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.
RYOBI----- with the motor running at high revs the chain stops indicates that the sprocket behind the centrifugal clutch is worn out or the centrifugal clutch itself ,or the clutch shoes are worn out the way to tell is to remove the bar and chain and have alook where the chain was conected to the saw, i think you will see the sprocket is buggered and as that is attatched to the clutch drum that will have to be replaced along with clutch springs and shoes, i think you have been running the chain a bit too loose or not running it at realy high revs ,which is what they are designed to do ,cme back to me if you feel the need
Does the motor continue to run when chain stops? Electric saws usually don't have a clutch, so I would look for badly-worn chain sprocket, or a possible sheared key in the sprocket hub, or a loose mounting nut. Remove the chain and bar, try to turn the sprocket by hand (wear good gloves). There may be some type of overload clutch built into the sprocket.
A new mounting bar would solve this issue. On that mounting bar there is a little piece that allows oil to drop onto the bar when you call for it or if this is a electric bar oil chain saw. Then it tracks when it needs to open.