How big of a rim sprocket? Narrow kerf shenanigans

[davidwyby]

20” Stihl 23RS (.325” NK) on a ported 2156/357xp. Thinking limbing and play, not burying it bucking.

 

[davidwyby]

 

[davidwyby]

Liking these new to me small chains, this and picco

 

[Funky sawman]

That 261 usta wear a 16 inch with 63ps 3/8 picco round chisel chain. It did real well, it just sucked for dirty wood. Seemed like after 5 sharpening's the chain had no more tooth left.

 

[Funky sawman]

.325 9 pin was one I ran before on a 346xp with Windsor full comp chain, that was one fast limbing saw

 

[Wilhelm]

I have noticed that my MMWS6100 (freaky fast saw) likes to jump the chain off the bar tail - 3/8" 20" B&C.
That K095 mount has quite a narrow tail, I'd be cautious with oversized drive sprockets.
With .325" I'd guess 8 pin is safe, but I wouldn't go over 9 pin either.

For reference, I have almost never had 3/8" jump off a D009 bar tail, and when I did it was on my 36" B&C setup on under cuts.

I am only writing this as limbing occurs at various heights and a derailed chain is the last You'd want.

Just for play!
Go crazy, but safely - try a 10 pin and let us know how it performed.

 

[Wilhelm]

Liking these new to me small chains, this and picco

Those chains generate a narrower kerf, lesser wood to remove = faster cutting.

I have a .325" setup for my PS-9010, it's fun.

 

[Wilhelm]

More chain tension so the chain don't jump off the bar, please!

Dry wood?
Looks like a lot of dust.

 

[~WBF]

An 8 is close to 3/8 ,7 T.
That's the max without modifications to the tail. Couldn't keep a chain on a 9 T 325 on my 262xp

 

[davidwyby]

More chain tension so the chain don't jump off the bar, please!

Dry wood?
Looks like a lot of dust.

First go so the chain stretched. 99% of my wood is dead dry dusty…it’s a desert…

I ordered a .325-9 large spline to try on the 2159 for a limber.

the 6100 I want to get set up with the 24” picco and 8 pin maybe?

 

[davidwyby]

I tried the 8 and picco 24” on the 2159, didn’t fit…ordered presets. Reckon I also need to order a spare loop of picco. @PA Dan you got any of your wicked little square stuff?

 

[PA Dan]

I tried the 8 and picco 24” on the 2159, didn’t fit…ordered presets. Reckon I also need to order a spare loop of picco. @PA Dan you got any of your wicked little square stuff?

Yes sir...

 

[davidwyby]

Stihl 23rs NK 20” on ported 2156=357xp. Had to grind the tail of the bar to get the chain over the 9 pin rim…should be fun!

Below is 24” 3/8” lo pro on ported 6100. I was able to get the chain on by putting it over the bar tip sprocket, installing the rim in the chain, and sliding it onto the drum. I like internal clutches…

Narrow kerf and lots of chain speed for both, should go pretty good. I was impressed with the 24” lo pro on the 2156 a while back bucking and noodling ponderosa.

 

[davidwyby]

 

[Battle Cross 2]

Stihl 23rs NK 20” on ported 2156=357xp. Had to grind the tail of the bar to get the chain over the 9 pin rim…should be fun!

Below is 24” 3/8” lo pro on ported 6100. I was able to get the chain on by putting it over the bar tip sprocket, installing the rim in the chain, and sliding it onto the drum. I like internal clutches…

Narrow kerf and lots of chain speed for both, should go pretty good. I was impressed with the 24” lo pro on the 2156 a while back bucking and noodling ponderosa. View attachment 329399View attachment 329400

Where are you getting those rims? I'd like to get an 8 pin for my echo 490 that I setup for 3/8lp.

 

[Duane(Pa)]

Where are you getting those rims? I'd like to get an 8 pin for my echo 490 that I setup for 3/8lp.View attachment 331017

Definitive Dave’s ebay outlet (chainsaw conservation components) is probably your best shot. 8 pin 3/8 lp is a pretty rare find, especially for a stihl spline, which you obviously don’t need, but there’s a few floating around. Much forum debate has gone into whether std. 3/8 rim will work. I’m not sure if your saw will be improved by an 8.

 

[davidwyby]

I just tried a 3/8"-8 on 3/8" low pro and it flared the DL out and they got stuck in the bar.

 

[Duane(Pa)]

I just tried a 3/8"-8 on 3/8" low pro and it flared the DL out and they got stuck in the bar.

Was the 3/8 x 8 a new rim? I believe I once read/heard that a worn rim would work. I gave up on LP/Picco entirely after one tank of .325 RSP

 

[Battle Cross 2]

I need to try the .325 again. It's been awhile since I played with it.

 

[Pincher]

Was the 3/8 x 8 a new rim? I believe I once read/heard that a worn rim would work. I gave up on LP/Picco entirely after one tank of .325 RSP

The 3/8lp/picco rim actually is slightly larger than the standard 3/8". 1.436" vs. 1.381 on the pair I just measured. I remember running across someone saying a worn .404 pitch rim works. I actually turned one down in the lathe and it seems to work. I still would like to find a 3/8lp/picco rim for normal small splines.
I did run 3/8lp on a regular rim with a 525 jonsered. I left the chain slightly loose and it worked. It never seemed "right". No noticeable wear on the rim or drive links after about half life of the chain. I switched it back to .325.