MS290 with 3/8" chain, what drive sprocket?

[country]

My third thread for my new/used MS290. It came with a new 20" bar, and 3/8" chain. If I recall correctly, the MS290's come new with 0.325" chain. How do I check the drive sprocket and make sure I have a match between it and the chain? Is the difference between fit of a 3/8" chain and 0.325" drive sprocket obvious enough by visual comparison to determine if the sprocket and chain pitch match? I haven't run the saw with the chain on it yet, I'm waiting until I can make sure the drive sprocket and new chain match. Thanks in advance all!

 

[Lobo]

It will be etched on the sprocket, you will see something on the side or face of it if you prefer such as:

.325 7T or .325 8T

the same will apply to 3/8''

.375 7T or .375 8T

7T or 8T is the number of teeth and size, a 8T is larger in diameter than a 7 and a 9T is larger in diameter than the 8T.

 

[country]

Checked out my saw last night, and have a 3/8 7 tooth drive sprocket. The chain is 3/8" with the triple hump depth gauge. From my manual, the chain should be a 3/8 RM then. Looks like everything matches fine. Thanks for the help!

 

[cbfarmall]

If you had a mismatched chain/sprocket you'd notice right away when you tried to pull the chain around the bar by hand. It would jumpy, rough, and catch all the time.

Chris B.