Modifying a bar tail

[Canadian farm boy]

I've got a 20" Stihl ES bar that I'm thinking of modifying for use with 3/8 9pin and 10pin sprockets. I know the tail of the bar needs to be cut.
My problem is that I don't have the sprockets yet.
Can anyone tell me the diameter of the sprockets or maybe even tell me how much of the bar tail I need to remove?

 

[cobey]

I've got a 20" Stihl ES bar that I'm thinking of modifying for use with 3/8 9pin and 10pin sprockets. I know the tail of the bar needs to be cut.
My problem is that I don't have the sprockets yet.
Can anyone tell me the diameter of the sprockets or maybe even tell me how much of the bar tail I need to remove?

I modified a couple tails but I always had
The sprocket and chain I was gonna use

 

[huskihl]

I've got a 20" Stihl ES bar that I'm thinking of modifying for use with 3/8 9pin and 10pin sprockets. I know the tail of the bar needs to be cut.
My problem is that I don't have the sprockets yet.
Can anyone tell me the diameter of the sprockets or maybe even tell me how much of the bar tail I need to remove?

If you're only running a 9, rumor has it (my limited experience as well) that you don't need to. I did have a chain derail on the 394, but it was from having the sprocket flipped the wrong way (the groove isn't in the center like on 7 and 8's). Once I flipped it, it's fine.

The 10 pin, as I understand it, is a different story

 

[huskihl]

But I can get you dimensions on a 9 pin if you'd like

 

[Canadian farm boy]

Having the diameter of the 9pin would be great.
Thanks

Does anyone have a 10pin they could measure?

 

[huskihl]

Having the diameter of the 9pin would be great.
Thanks

Does anyone have a 10pin they could measure?

@Definitive Dave

 

[Redfin]

Mike, I bugged J and he measured his 10 pin @ 53.17mm

 

[Canadian farm boy]

Mike, I bugged J and he measured his 10 pin @ 53.17mm

Perfect. Thanks.

 

[Canadian farm boy]

Another question here guys.
If I cut the bar tail to use 9 and 10 pin rims will I still be able to use 7 and 8 pin rims?

 

[mdavlee]

There will be a long jump for the chain with smaller sprockets.

 

[T.Roller]

I have a 20" bobbed for a 10 pin and I also use it for my 9 pin. Only problem I ever had was I derailed a 28" with my 9 pin showing off lol

 

[Time's Standing Stihl]

I don't go over 9 pin for that reason. Crazy stuff happens unless your set up for racing.

Kinda like hitting 88 mph

Sent from my SM-G900R4 using Tapatalk

 

[Stihlbro]

9,10 and 11 from left to right. I was tryin a one shot picture here.

 

[Chainsaw Jim]

View attachment 30223
9,10 and 11 from left to right. I was tryin a one shot picture here.

Is that 10 pin a .325?

 

[CR500]

If you're only running a 9, rumor has it (my limited experience as well) that you don't need to. I did have a chain derail on the 394, but it was from having the sprocket flipped the wrong way (the groove isn't in the center like on 7 and 8's). Once I flipped it, it's fine.

The 10 pin, as I understand it, is a different story

can anybody verify this rumor?

 

[Stihlbro]

Is that 10 pin a .325?

I will go measure. By the picture ain't much difference than the one to the left.

 

[Canadian farm boy]

Anyone got a picture or two, maybe a before and after shot of a modified bar tail?

I think I know what I need to do. I just want to be sure before I do any cutting or grinding.

 

[Chainsaw Jim]

Anyone got a picture or two, maybe a before and after shot of a modified bar tail?

I think I know what I need to do. I just want to be sure before I do any cutting or grinding.

All is done is the smaller end of it is chopped off or ground down so the chain doesn't span very far before it reaches the bar groove. You'll end up a few drivers too many if the larger sprocket doesn't compensate. You'll need to lengthen the bar stud slot and relocate oiler and adjuster holes. Just make sure you don't remove enough tail to leave an edge for the chain to catch on.
Here's an after pic of a regular Stihl mount for the saws up to 660, where i have it set up to ride about 1/8" away from a 3/8 9-pin sprocket.

 

[huskihl]

Having the diameter of the 9pin would be great.
Thanks

Does anyone have a 10pin they could measure?

Sorry Mike. I went out to the garage and got sidetracked for 14 hours and never did measure the dang thing

 

[Canadian farm boy]

Sorry Mike. I went out to the garage and got sidetracked for 14 hours and never did measure the dang thing

No worries. I took a chance and did the mods. As far as I can tell it looks like it should work. I'll hopefully find out Saturday