Don`t let it run anymore like this. There is a risk to seriously damage the engine. If you don`t have the proper pressure and vaccum tester with adapters, take it to the dealer. Often the air leaks are on the sealing rings of the cranckshaft, but there are other possibilities too.
Stihl 661 mtronic wont idle
- Thread starter Jza
- Start date
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Jza
ArboristSite Member
I havnt been running it, trying to get it running lol. Yeah I'm thinking I will have bite the bullet if I can't figure it out
Jza
ArboristSite Member
I feel your pain ! This saw has been a pain in the ass lol
Crazy...cuz the 2 661s I repaired with new solenoids are back on the job. But...they got white ones that are no longer available from my dealer. I may call around to others and see if they have any left overs. My gal can only order green now.
Jza
ArboristSite Member
That's what I got told too.. I have a 660 thats an absolute monster , I was hoping to retire it and upgrade to the 661 with better a.v
Outback1
ArboristSite Member
Did you check the plastic piece on the flywheel side? The O’ring on that piece goes bad along with the seal or the plastic itself warps causing not to seal properly.
I went through this solenoid crap on two 661 a while back.
Looking on my Stihl dealers computer at the parts diagram the black solenoid is no longer available and the green one is for older saws with 1st gen coil saws only. White solenoid is for the later coiled saws only.
I ended up putting the green one in the older saw and a white one in the later saw this got them both running as should again... well until a solenoid craps itself again lol
I've said it before I hope Stihl have a stockpile of solenoids stashed away somewhere to last into the unforeseeable future, or there will be a lot of 661's sitting on shelves unusable in a decade or two.
Looking on my Stihl dealers computer at the parts diagram the black solenoid is no longer available and the green one is for older saws with 1st gen coil saws only. White solenoid is for the later coiled saws only.
I ended up putting the green one in the older saw and a white one in the later saw this got them both running as should again... well until a solenoid craps itself again lol
I've said it before I hope Stihl have a stockpile of solenoids stashed away somewhere to last into the unforeseeable future, or there will be a lot of 661's sitting on shelves unusable in a decade or two.
not familiar with that. Part #? All I see is the seal
Jza
ArboristSite Member
My dealer seems to think the white one in an outdated solenoid and the green one is the current one . I can only go off what he says but its very conflicting to what everyone else says on this forum .
I don't really care what one I use as long as it works lol
Same here. Just spent an hr or so swapping solenoids, trigger units and another carb on this 261. Played with 2 black, 1 white and a green. Each one worked for reset mode but the saw wouldn't run after that. Idled for a while...wot kills it. Odd because yesterday I couldn't get it to reset but got it to run fine by choke it, then start by holding the trigger and pull start. Then everything worked as normal other than not going into reset. This with an old black sol. Today I wanted to try a green to see if it would reset normally...worked. but, wouldn't run, lol.
I think it is cursed.
Jza
ArboristSite Member
Feel your pain ! No air leaks ?
Nope ,at least not the case...vac and pressure good. But, the fast idle acted link a leak so swapped carbs...figured carb leak. That stopped the fast idle and it ran normally but wouldn't go into reset mode. (Black sol)
Thinking a nice new green would fix the rest. Goes into reset, no problem but now won't keep running
I tested the initial carb...passed, sigh...
Dealer owes me a favor so will have them hook it up next week.
Thinking a nice new green would fix the rest. Goes into reset, no problem but now won't keep running
I tested the initial carb...passed, sigh...
Dealer owes me a favor so will have them hook it up next week.
And sometimes it is the carburetor.
I have a chart that shows what fits what. It may even be on here someplace. It is still a chainsaw. All the same rules apply.
I have a chart that shows what fits what. It may even be on here someplace. It is still a chainsaw. All the same rules apply.
Gonna try another carb on mine but have to replace a broken throttle shaft first.
Jza
ArboristSite Member
Hey any chance if you find that chart you could post it ?
Going to work today. I will try to remember to grab it.
M-Tronic Solenoid valve updates for Professional Chainsaws
1/4/2023
Customer Complaint
Engine dies at idle or is difficult to restart when hotAverage Time of Failure
Medium to High runtimeInitial Checks
- Winter / Summer shutter present and in the correct position?
- Fuel in fuel tank?
- Winter blend fuel during hot weather in the Spring?
- SDS / MDG Solenoid Valve leakage test.
Potential Cause
Black solenoid valve worn and not sealing when closed.Action
Replace M-Tronic Solenoid Valve, Calibrate the Unit.Replacement / Update information
MS 201 TC-M <186967963
Replace black solenoid valve with green solenoid valve (0000-120-5111)Install new orange mesh fuel filter (0000-350-3522)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
MS 261 C-M <522260407
Replace black solenoid valve with green solenoid valve (0000-120-5111)Install new orange mesh fuel filter (0000-350-3518)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
MS 362 C-M <183609631
Replace black solenoid valve with green solenoid valve (0000-120-5111)Install new orange mesh fuel filter (0000-350-3518)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
MS 661 C-M <184316256
Replace black solenoid valve with green solenoid valve (0000-120-5111)Install new orange mesh fuel filter (0000-350-3518)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
Production Improvement
Production change to White (wear resistant) solenoid valve and M-Tronic 3.0 software in production above serial number:- MS 201TC-M: 186967963
- MS 261C-M: 522260407
- MS 362C-M: 183609631
- MS 462C-M: Since start of production
- MS 661C-M: 184316256
Part Number(s)
Original black solenoid (0000-120-5110) can always be replaced with the new green solenoid (0000-120-5111).In the rare case of a white solenoid (0000-120-5104) failure, please replace it with another white solenoid.
Illustrated parts lists have been updated to reflect these changes.
Black Solenoid (0000-120-5110) is discontinued.
Jza
ArboristSite Member
Thanks much appreciated!
M-Tronic Solenoid valve updates for Professional Chainsaws
1/4/2023
View attachment 1104635
Customer Complaint
Engine dies at idle or is difficult to restart when hot
Average Time of Failure
Medium to High runtime
Initial Checks
- Winter / Summer shutter present and in the correct position?
- Fuel in fuel tank?
- Winter blend fuel during hot weather in the Spring?
- SDS / MDG Solenoid Valve leakage test.
Potential Cause
Black solenoid valve worn and not sealing when closed.
Action
Replace M-Tronic Solenoid Valve, Calibrate the Unit.
Replacement / Update information
MS 201 TC-M <186967963
Replace black solenoid valve with green solenoid valve (0000-120-5111)
Install new orange mesh fuel filter (0000-350-3522)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
MS 261 C-M <522260407
Replace black solenoid valve with green solenoid valve (0000-120-5111)
Install new orange mesh fuel filter (0000-350-3518)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
MS 362 C-M <183609631
Replace black solenoid valve with green solenoid valve (0000-120-5111)
Install new orange mesh fuel filter (0000-350-3518)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
MS 661 C-M <184316256
Replace black solenoid valve with green solenoid valve (0000-120-5111)
Install new orange mesh fuel filter (0000-350-3518)
Units above the serial break are M-Tronic 3.0 and will be equipped with a white solenoid valve.
Production Improvement
Production change to White (wear resistant) solenoid valve and M-Tronic 3.0 software in production above serial number:
- MS 201TC-M: 186967963
- MS 261C-M: 522260407
- MS 362C-M: 183609631
- MS 462C-M: Since start of production
- MS 661C-M: 184316256
Part Number(s)
Original black solenoid (0000-120-5110) can always be replaced with the new green solenoid (0000-120-5111).
In the rare case of a white solenoid (0000-120-5104) failure, please replace it with another white solenoid.
Illustrated parts lists have been updated to reflect these changes.
Black Solenoid (0000-120-5110) is discontinued.
