The chain on the 16 in chain saw keep slipping. Seems the thumb screw will not stay tight? Who can check this and fix?

Make sure chain tension on the bar is correct and then the 2 nuts holding the bar is correct, Youtube has alot of videos on how to set chain tension as well as the Oregon website

Hello there, I just used 30 weight non detergent on my Still gas saw years ago.Mainly because it got used so fast.You might check your local bicycle shop cause they have stuff that stays on the chain better($10.00 and up).Just keep the chain sharp and don't overload it. Most any hardware store will carry some kind of chain oil.You could call a saw shop and ask them as well.I burnt up the plastic chain adjuster once because the chain was to tight ,had plenty of oil but chain was to tight.About 1/8 gap or a little less at the bottom the bar.Unplug , wear gloves and pull the chain around the bar to check for binding. THANK YOU for choosing FixYa.com.

Does the chain stay tight. If not it will fall off. Make sure the bar is fitting snugly against the body of the saw and that the chain is fitting in the drive sprocket properly. There should be a tensioner screw to help tighten the chain. Make sure that is secure. Otherwise take it back for refund or replacement.

You're not tightening the nut tight enough.

Open the right side of the saw enclosure where the chain screw adjuster is.After that you will see the screw,unscrew and thigh the chain forward but not too much just adjust and test by hand,tight the screw and do a start test.

Post or thumbs back!

i cant tell you were to look but i can tell you what to look at on the saw to try to fix it,,,,first change the spark plug and check for a spark by holding the plug on the cylinder head and cranking the motor over,,,hold it down tight or it will bite you?
then check you have a clean carb and that the fule pump rubber is good,,its under the cover were the fule pipe fit on the carb clean the carb out as well,,clean the air filter out,, then give it a go starting her up,,if she runs but keeps stoping get a small screw driver and find the two small screws on the side of the cover,, one is for slow running,,one it for top reves,,,undo the slow running screw till the saw ticks over without stoping,,then hold the triger full open and addjust the full throtol screw till it wont rev any higher,,,dont have the chain brake on at all so watch your self,,,,,cutting a leg off hurts im told????

Losen the bar mounting nut, then losen the chain tension adjustment screw until the chain can be reinstalled, then tighten the tension screw until the chain just sags 1/8" or so at the center of the bar then retighten the bar mounting nut.

1. It is common for a new chain to stretch. that is probably what occurred
2. I'd hold the tip of the bar 2-3" above a stump or even a news paper, rev it up for a few seconds and look for a line of bar oil. If none is visible your bar oil reservoir is empty or saw isn't oiling. If you added oil and it's not oiling return it to where you purchased it.
HTH
Lou

Here is a link to instructions for EL-8 series saws ... http://www.desatech.com/pdf/115499-01_EL8_Series_Chain_Saw_Tension_Adjustment.pdf. For series LNT-2, LNT-3,EL-1, and EL-7 according to the manufacturer... "WARNING: The cutting edges on the chain are sharp. Protective gloves should be used when touching the chain. Unplug the chain saw from the power supply. Allow chain to cool. Loosen the guide bar nuts until they are finger tight. Ensure the adjusting block is in the adjustment hole in the guide bar. Turn the chain tensioning screw clockwise to increase tension. Turn the chain tensioning screw counterclockwise to decrease tension. Check for proper chain adjustment by pulling down on the chain at the bottom center of the guide bar. You should see no more than a ⅛ inch gap between the chain cutting links and the guide bar. The guide (or drive) links should not come out of the guide bar grooves. The chain should rotate freely around the guide bar. If it does not, chain tension should be decreased. When the chain is properly adjusted, tighten the guide bar nuts securely." On the M series if your chain keeps slipping off your sprocket... The Sprocket cover tab (located on the round part of the sprocket cover) isn’t inserted into the saw body tab slot. I hope this helps you!

with the electric makita you should make sure the bar is sitting on that oval slide piece on the saw. they should fit together so that the bar will sit flush against the clutch plate and saw. attach the cover with the nut and tighten just enough to hold the cover on. then turn the screw on the nose of the saw, next to the bar, and then tighten the nut the rest of the way. if there's slipping or the chain wont tighten you should inspect the bar to make sure it is sitting flush against the saw.