MS290 Questions about Sprocket, Bar & Chain Set Ups

JP56

ArboristSite Operative
Joined
Nov 14, 2018
Messages
124
Location
CT
My MS290 (Series 1127) as purchased, is set up with a 7T Spur Sprocket running 18" & 20" bars with the .325 chain. My 18" & 20" bars are currently "Green" dot OEM bars marked Farm Boss, & I still have a 2md 18" bar that marked as "STIHL Rolomatic", which I noticed is a slightly different shape that the dealer sold me when I purchased everything. As for the chains they have been selling me, some have the "Green" & some have the "Yellow" Designation, & some are "26 RM3 Rapid Micro" & some are "26 RS Rapid Super".

I have several saws, & most of them are set up for 3/8 x .50. Only this one uses the .325 & I have 1 or 2 others that use the 3/8 x .43 & .63.

I would like to set them all up to use the 3/8 x .50 chain If Possible, so all I would have to do is order the different lengths or buy bulk & make my own as needed, especially with all this covid crap & supply "shortages" being driven by it.

My Questions:

1) What EXACTLY is the difference between using the Green Dot & Yellow Dot, and is using the one color chain on the other color bar ok?

2) What Exactly is the difference between Rapid "Super & Micro", is there an advantage of one over the other ?

2) Can I change my 290 Sprocket to a 7T Rim Sprocket & 18" & 20" bars that will run 3/8 chain?
 
cookies

cookies

ArboristSite Guru
Joined
Nov 26, 2020
Messages
749
Location
Crawfordville
I put rim sprocket setups on my 290's, makes switching from .325 to 3/8 chain as simple as a sprocket swap if you wanted to do so. If you put 3/8 chain on a 290 expect to run a 16" bar in order to pull and oil it decently. Using 20" .325 on a 290 it can barely oil it enough and chain speed is pretty slow in a big cut, keep your chain razer sharp and it does well enough, I would be afraid of ruining a 20" 3/8 setup from lack of oil and it would bog and cut too slow. I did turn a 290 into a pretty sweet modified 390 that would easily pull a 20" 3/8 but it cuts really great running the .325 20".
 
Camocountry

Camocountry

New Member
Joined
Apr 24, 2020
Messages
2
Location
Idaho
My MS290 (Series 1127) as purchased, is set up with a 7T Spur Sprocket running 18" & 20" bars with the .325 chain. My 18" & 20" bars are currently "Green" dot OEM bars marked Farm Boss, & I still have a 2md 18" bar that marked as "STIHL Rolomatic", which I noticed is a slightly different shape that the dealer sold me when I purchased everything. As for the chains they have been selling me, some have the "Green" & some have the "Yellow" Designation, & some are "26 RM3 Rapid Micro" & some are "26 RS Rapid Super".

I have several saws, & most of them are set up for 3/8 x .50. Only this one uses the .325 & I have 1 or 2 others that use the 3/8 x .43 & .63.

I would like to set them all up to use the 3/8 x .50 chain If Possible, so all I would have to do is order the different lengths or buy bulk & make my own as needed, especially with all this covid crap & supply "shortages" being driven by it.

My Questions:

1) What EXACTLY is the difference between using the Green Dot & Yellow Dot, and is using the one color chain on the other color bar ok?

2) What Exactly is the difference between Rapid "Super & Micro", is there an advantage of one over the other ?

2) Can I change my 290 Sprocket to a 7T Rim Sprocket & 18" & 20" bars that will run 3/8 chain?
I'm running a rim sprocket 20" yellow chain on my ms290 with know problems.
 
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