Problems Stihl MS261CM

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tadmaz

Feeling the Heat
Dec 21, 2017
473
Erin, WI
I've heard about the solenoid stuff before. I guess I will get the kit with the white solenoid and orange filter. I crushed my index finger and I could use a little project while I heal up.
 

3fordasho

Minister of Fire
Jul 20, 2007
1,001
South Central Minnesota
Purchased a new 661C in 2015 with an early version of mtronic with the white fuel solinoid. Probable not even 2 hrs of use and the thing would not restart hot in short order (of course out of warranty) I just replaced all the mtronic components with version 3 mtronic, the kit includes the improved black fuel solinoid, orange fuel filter/pickup, and new coil/control module. Just over $100 and so far so good. Part number for the kit is 1144 007 1801. There is some youtube videos detailing replacement of all three items, not too difficult and took about an hour. I did need a t-10 torx bit with the hole (tamperproof).
 
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tadmaz

Feeling the Heat
Dec 21, 2017
473
Erin, WI
I think you're mixing up the solenoid colors. Black solenoid/white filter bad. White solenoid/orange filter good. Specifically for the MS261, no coil/control module needed. Part# 1140 007 1802
 

3fordasho

Minister of Fire
Jul 20, 2007
1,001
South Central Minnesota
I think you're mixing up the solenoid colors. Black solenoid/white filter bad. White solenoid/orange filter good. Specifically for the MS261, no coil/control module needed. Part# 1140 007 1802
You are correct sir. And now it's too late to edit. Black solinoid= bad, white solinoid = new and improved.
white filter= first version, orange filter= better filtration.
 

tadmaz

Feeling the Heat
Dec 21, 2017
473
Erin, WI
I had to convince the stihl guy at my ace hardware to order the exact part# I wanted. Got the kit. My MS261 was made in 02/18 and it had the black solenoid and white filter. I was able to replace the solenoid without removing the carb or anything, just a little tricky getting the clip and small screw back in. Runs great. May be a while before I run the saw in hot conditions to see how it does.
 
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Sodbuster

Minister of Fire
Sep 22, 2012
1,506
Michigan
Not sure if this would cause a difference, but on my MS261, there is a winter and summer orange tab under the cover, in the winter position it directs some heat from the engine to keep the carb from icing up. In the summer position that hole is closed, simply slides in and out with a screwdriver.
 

Sodbuster

Minister of Fire
Sep 22, 2012
1,506
Michigan
Black solenoid, white filter. Mine is definitely not a version 3. It was purchased 11/2/2017
 
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Woody5506

Minister of Fire
Feb 14, 2017
866
Rochester NY
Sodbuster, I'm not a huge gear head but I have the same saw and my assumption is once you ran the thing dry from the old fuel, it becomes a bit tougher to get going again on a refill. Why this is, I do not know, but I've gotten used to it and try not to run the fuel dry for that reason. Everytime I do, it does what you described. Start up hard, then putter for a bit, give it throttle and it dies out or really bogs down. I basically let it idle for a bit and start feathering the throttle and its fine from there.
 

tadmaz

Feeling the Heat
Dec 21, 2017
473
Erin, WI
Sodbuster, I'm not a huge gear head but I have the same saw and my assumption is once you ran the thing dry from the old fuel, it becomes a bit tougher to get going again on a refill. Why this is, I do not know, but I've gotten used to it and try not to run the fuel dry for that reason. Everytime I do, it does what you described. Start up hard, then putter for a bit, give it throttle and it dies out or really bogs down. I basically let it idle for a bit and start feathering the throttle and its fine from there.
Do you have the black solenoid? If so, get the white one and let us know if it helps. Black one is known to stay open (flood) when you turn the saw off.
 

Sodbuster

Minister of Fire
Sep 22, 2012
1,506
Michigan
Thanks Woody and Taz, I have the white solenoid. It sat for a year drained of fuel, after I shattered my wrist. Ran a couple of tanks of 90 octane, off road fuel and Stihl Platinum oil and some Sea-foam, and now it runs like a banshee, and starts great.
 

Sodbuster

Minister of Fire
Sep 22, 2012
1,506
Michigan
Thanks Woody and Taz, I have the white solenoid. It sat for a year drained of fuel, after I shattered my wrist. Ran a couple of tanks of 90 octane, off road fuel and Stihl Platinum oil and some Sea-foam, and now it runs like a banshee, and starts great.
And correction to Tadmaz, I previously quoted it was black, when it is definitely white.
 

Sodbuster

Minister of Fire
Sep 22, 2012
1,506
Michigan
Thanks for doing the math, didn't realize it was such a trivial amount. I run everything on 40:1 and tune the saws accordingly.


As far as the OP's 261, it does sound like the computer needs to learn the saw again after it sat for several months.
You are correct, the more I run it the stronger it gets. Was cutting some 16" dead Ash today, and it just keeps pulling harder and harder, throwing chips like crazy.
 

SpaceBus

Minister of Fire
Nov 18, 2018
5,958
Downeast Maine
You are correct, the more I run it the stronger it gets. Was cutting some 16" dead Ash today, and it just keeps pulling harder and harder, throwing chips like crazy.
It's a pretty slick system. Any future saw purchases will be fuel injected/auto tuned or electric.
 

Woody5506

Minister of Fire
Feb 14, 2017
866
Rochester NY
Do you have the black solenoid? If so, get the white one and let us know if it helps. Black one is known to stay open (flood) when you turn the saw off.
Mine doesn't flood. But, just like my small 211, when you run it out of gas, it just acts like it takes some coaxing to get the gas flowin'