Author Topic: MS 261CM hot weather issue?  (Read 314 times)

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Offline Old Iron Logging

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MS 261CM hot weather issue?
« on: September 19, 2016, 08:13:50 pm »
Anyone seeing or hearing of running issues with the 261CM in 80 plus temps with high humidity?

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Offline Cut4fun .

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Re: MS 261CM hot weather issue?
« Reply #1 on: September 19, 2016, 08:58:54 pm »
I've heard of m-tronic issues with them.  None that I read on had to do with heat etc.  Maybe it was and they didnt put 2 and 2 together?
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Offline Old Iron Logging

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Re: MS 261CM hot weather issue?
« Reply #2 on: September 19, 2016, 09:32:29 pm »
What issues are you hearing about? We have a number of saws that test fine but will not idle down as they should. Replaced coils, carbs, solenoid so but no change.

Offline Cut4fun .

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Re: MS 261CM hot weather issue?
« Reply #3 on: September 20, 2016, 01:18:28 pm »
Using and get running temp, set down idle and die, harder to restart idle and die, even harder to restart if you can restart. Sometimes never restart after couple trys.

Have you tried resetting them?   

I'm just WAGing no clue here.

I know I would like to check out one of those NE type II 2 261 with regular carb though. ;)  Looks sweet and light as all get out.



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Offline Old Iron Logging

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Re: MS 261CM hot weather issue?
« Reply #4 on: September 20, 2016, 05:25:57 pm »
Saws all test fine on computer. Gave one customer a new saw after third trip in for same issues. Changed seals, coil, carb, clutch,etc at techs recommendation. Works great in shop but problems resurface in the woods. 4 saws doing the same thing. I read over a year ago something about high humidity issues but can't find it anymore.
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Offline Cut4fun .

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Re: MS 261CM hot weather issue?
« Reply #5 on: September 22, 2016, 01:22:21 pm »
@Bushweasel  Jason you have anything on this? 

I know BW said he likes the 261 and has ported a couple out west. 
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Offline Old Iron Logging

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Re: MS 261CM hot weather issue?
« Reply #6 on: September 22, 2016, 06:59:55 pm »
Shop tech started the saw today. Has not run in 4 days. Idles at 10,000 rpm.

Offline Bushweasel

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Re: MS 261CM hot weather issue?
« Reply #7 on: October 01, 2016, 06:54:53 pm »
Faulty/leaking decomp valve?

Offline Bushweasel

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Re: MS 261CM hot weather issue?
« Reply #8 on: October 01, 2016, 07:01:40 pm »
Sounds to be an air leak or fuel restriction. Passed all the test, so air leak is out. Pinched fuel line or faulty filter?? wiring harness??

Offline Old Iron Logging

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Re: MS 261CM hot weather issue?
« Reply #9 on: October 01, 2016, 10:09:10 pm »
Every startup the saw acts differently. Sent it to Stihl to let them play with it. 4 more with similar issues in shop.

 

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