MS310 cylinder

[Edge & Engine]

I picked up a used cylinder for an MS310, to replace one on a saw of mine that had stripped out plug threads. Today I was installing it, and I found out that it's too big (the bore). Is it possible that there was 2 sizes used on this model, or is it simply not for a 310?

 

[Brad101]

I do not believe the cc's have ever changed on the MS310. Though what you might be working with is a MS 290 believed to be a MS 310, or a MS 310 that is really a MS 390.

I have had good luck on those cylinders with stripped plug threads using a thread insert to repair instead of changing the cylinder.

Good Luck.

 

[Edge & Engine]

I do not believe the cc's have ever changed on the MS310. Though what you might be working with is a MS 290 believed to be a MS 310, or a MS 310 that is really a MS 390.

I have had good luck on those cylinders with stripped plug threads using a thread insert to repair instead of changing the cylinder.

Good Luck.

Well the saw says MS310 on the starter cover, and as far as I know everything is original.

Unfortunately, the old cylinder was the victim of a botched thread repair job (NOT done by me) Whoever did it drilled the hole out too big and totally ruined it.

 

[Brad101]

What I meant to say on the last part of that is a MS 390 cylinder instead of a MS 310 cylinder.

Sorry.

 

[Brad101]

It is possible the starter could have been changed at some point. The only ways to know forsure would be to measure the piston in mm's. Or run the serial number through a stihl dealer.

 

[2000ssm6]

The 290, 310 and 390 series can use the same p&c on all of 'em. If the bore is too big, you may have a 390 cylinder. What does the cylinder measure?

Here are piston sizes:
290 46mm
310 47mm
390 49mm

 

[icelation8]

I think the bore size is written somewhere on the side of the cylinder.

 

[Edge & Engine]

Well I measured the bores and it's 47mm on the original cylinder, and 49mm on the new used on that I got. That would be from an MS390, correct?

 

[Saw Dr.]

I had a 290 cylinder and a 039 cylinder. The 290 one said 029 on the side, and the 039 one said 039 on the side. I doubt an 310 cyl would say 031, since they're different saws. What's the cyl say on it?

 

[Saw Dr.]

Well I measured the bores and it's 47mm on the original cylinder, and 49mm on the new used on that I got. That would be from an MS390, correct?

49mm is 390/039

 

[Edge & Engine]

I had a 290 cylinder and a 039 cylinder. The 290 one said 029 on the side, and the 039 one said 039 on the side. I doubt an 310 cyl would say 031, since they're different saws. What's the cyl say on it?

I'll look tomorrow. Thanks for the help.
I have to decide what I want to do, I'll probably have to sell the 390 cylinder and try to find the right one for a 310. The reason is that the saw is for resale and even if I say it is the equivalent of a 390, the buyer would have no reason to believe me sight unseen.

 

[Saw Dr.]

Put an ad on here. You will have NO trouble offing a 390 cylinder. I bet you got a few PM's on it already.

 

[2000ssm6]

Just get a 390 piston.

 

[woodchuck361]

P.M. sent.