Stihl MS171 Mod

BlackGun

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I bought a 12” bar and chain today and converted it to a limber and in tree saw. Speaking to the salesman who is very knowledgable he suggested the 12” instead of the 14” I wanted. He said at 14” bogged down with an aggressive chain. I also ordered a side tension adjustment converse to replace the factory screw which is under the blade bar. The chain is now a yellow 3/8” instead of the .325” green anti kickback. Have not run it yet.

A new Stihl MS391 is on order from James River. When it gets here I’ll convert the bar to 25” which nobody has nor even the saw at any bar length.

My go to dealer for most lawn stuff said any Stihl product made in Germany is almost impossible to get. Only the Virginia products which are homeowner sizes have been available.

Plan on taking down a large poplar by climbing up in the tree with a 34’ ladder to drop the limbs first. The 12” bar should be easier to manage. Hope this ends well with my house and the neighbors on each side.
 
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Did you change the clutch sprocket? .325 won't work with the 3/8.



Well it will for a few minutes
I bought a 12” bar and chain today and converted it to a limber and in tree saw. Speaking to the salesman who is very knowledgable he suggested the 12” instead of the 14” I wanted. He said at 14” bogged down with an aggressive chain. I also ordered a side tension adjustment converse to replace the factory screw which is under the blade bar. The chain is now a yellow 3/8” instead of the .325” green anti kickback. Have not run it yet.

A new Stihl MS391 is on order from James River. When it gets here I’ll convert the bar to 25” which nobody has nor even the saw at any bar length.

My go to dealer for most lawn stuff said any Stihl product made in Germany is almost impossible to get. Only the Virginia products which are homeowner sizes have been available.

Plan on taking down a large poplar by climbing up in the tree with a 34’ ladder to drop the limbs first. The 12” bar should be easier to manage. Hope this ends well with my house and the neighbors on each side.
 
Did you change the clutch sprocket? .325 won't work with the 3/8.



Well it will for a few minutes
I questioned that and was told it works with both if its a RM3 clutch sprocket but not RS3. The chainsaw guy at the store said he did it to his smaller Stihl.
 
I'm pretty sure a .325 is 7 tooth and a 3/8 is a 6 tooth. I've been wrong before, but I don't think I am about this

I know it doesn't work on any saw I've ever worked on
I questioned that and was told it works with both if its a RM3 clutch sprocket but not RS3. The chainsaw guy at the store said he did it to his smaller Stihl.
 
I think the RS3 is 3/8" so I'd check that.

Not sure I'd want a 25" bar on a 64cc saw in hardwood. Poplar is pretty soft stuff.
stick that bar in hickory or locust and you may go back to the 20". Not sure if it works the same on the homeowner saws but max out your oiler if possible. I think that's a big bar for that oiler.
 
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I'm pretty sure a .325 is 7 tooth and a 3/8 is a 6 tooth. I've been wrong before, but I don't think I am about this

I know it doesn't work on any saw I've ever worked on
I’ll check into Shane. I turned the chain with the cover off a bunch with no bind but never counted the sprocket teeth. After your post I took it back apart to observe the gapping. Then I ran it slowly on the ground for a few minutes. Then I made two cuts on a downed Holly tree log. Ran fine but that doesn’t prove anything.

I didn’t like that 3/8” aggressiveness on limbs. That is not an in tree limbing chain in my opinion. I may go get the green for in a tree.

I think the RS3 is 3/8" so I'd check that.

Not sure I'd want a 25" bar on a 64cc saw in hardwood. Poplar is pretty soft stuff.
stick that bar in hickory or locust and you may go back to the 20". Not sure if it works the same on the homeowner saws but max out your oiler if possible. I think that's a big bar for that oiler.
You’ve given me something to research. Heck of a lot more chain to oil. I’ve never seen a oiler adjustment on anything I have owned and little experience in troubleshooting. I’ll see if google can answer that.
 
Be very careful with a ladder and cutting tree limbs many people have been hurt or killed when the limb they were cutting swung down and took the ladder out from under them. Had a distant relative die this way.
 
Be very careful with a ladder and cutting tree limbs many people have been hurt or killed when the limb they were cutting swung down and took the ladder out from under them. Had a distant relative die this way.
I did that at yalls church years ago. Keck paid me to trim the bottom limbs up on everything. Hung myself in my saddle for a few minutes
 
I’ll check into Shane. I turned the chain with the cover off a bunch with no bind but never counted the sprocket teeth. After your post I took it back apart to observe the gapping. Then I ran it slowly on the ground for a few minutes. Then I made two cuts on a downed Holly tree log. Ran fine but that doesn’t prove anything.

I didn’t like that 3/8” aggressiveness on limbs. That is not an in tree limbing chain in my opinion. I may go get the green for in a tree.


You’ve given me something to research. Heck of a lot more chain to oil. I’ve never seen a oiler adjustment on anything I have owned and little experience in troubleshooting. I’ll see if google can answer that.

Be careful if buying a new chain there is a 3/8 and 3/8low profile size. They low profile is usually what is on some smaller or limb saws or some even drop down to 1/4. Also many of the homeowner line saws don’t have a oiler adjustment is reason you might not have seen it. If it does have one its usually on bottom of saw you will see single screw adjustment on stihl its a flat head with chain symbol near it.
 
I did that at yalls church years ago. Keck paid me to trim the bottom limbs up on everything. Hung myself in my saddle for a few minutes

Should have called you again couple years ago then 😝 instead I was the one in the telehandler basket.
 
I'm pretty sure a .325 is 7 tooth and a 3/8 is a 6 tooth. I've been wrong before, but I don't think I am about this

I know it doesn't work on any saw I've ever worked on
I took the cover back off and it’s a 6 tooth. Thanks for getting me to check that. That’s why I run stuff by the people on here. You’ve educated me further on what to check.

My home saw has no oiler adjustment. Not sure about the ms391 until I find an owners manual online. I can say a 25” bar is in the recommended length for it. Let me know Shane if you find an adjustment screw as recommended above.

My safety harness got left on a jobsite and I haven’t replaced it.
 
391 should have an oiler adjustment screw
Thanks.

Owners manual says it is optional on saws but the manual is for multiple chainsaws. One thing I did notice is there is a winter change in a hose where you flip the hose 180 degrees. Doubt that applies in NC weather. It’s not like we are at 15 degrees or less situations.

Edit: I said hose but it’s a plate of some kind that diverts air to be warmed from around the cylinder.
 
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Thanks.

Owners manual says it is optional on saws but the manual is for multiple chainsaws. One thing I did notice is there is a winter change in a hose where you flip the hose 180 degrees. Doubt that applies in NC weather. It’s not like we are at 15 degrees or less situations.

Edit: I said hose but it’s a plate of some kind that diverts air to be warmed from around the cylinder.
I have one that has that. But the temp is a lot higher than 15°. Maybe 40°? It’s either listed on the saw or in the manual.
 
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