Problematic MS661
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Moparmyway
Its just a saw
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I would just pull out those pesky washers from the intake bellows.
Thats what I did to mine. After a long idle time, its got a pretty good stumble, but it clears up quickly. If I feather the throttle slowly, no stumble. Fuel is puddling in the bellows, the straight intake fixes it.
I would rather deal with the stumble after idling that have the washers block off the intake, but thats just me.
Thats what I did to mine. After a long idle time, its got a pretty good stumble, but it clears up quickly. If I feather the throttle slowly, no stumble. Fuel is puddling in the bellows, the straight intake fixes it.
I would rather deal with the stumble after idling that have the washers block off the intake, but thats just me.
Funny you say about the long idle and stumble. It seemed like that's what would kill that first 661 I had. Let it idle for 40 seconds while your clearing the butt of a tree and and pick it and squeeze the throttle and it would look like a DDT fogger and out just couldn't get over the bog once that happened.
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Moparmyway
Its just a saw
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Did you look for them, or fish for them (hook them and grab them) ?
You wont see them if they are in there where they belong, but you can hook them and pull them out. Thats what I did with mine
Moparmyway
Its just a saw
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I would talk to the dealer and ask him if he can order you a straight boot for it, run it untill it arrives
You might grow old and grey waiting for it though
You might grow old and grey waiting for it though
Nahhh no talking to the dealer. We're going to run the guts out of it like all our other saws and if it gives up the ghost it'll get replaced. My dealer and I aren't really seeing eye to eye rite now after the run around with my other saw.
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shawn022
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Run the hell out of it. If it messes up, contact Stihl directly. Its the only way they're going to get this saw straightened out. And since you make your living cutting trees, always have a 660 close by.
If you're ever in northern Butler county ,stop by and you can run mine . Don't have anything big to feed it right now so it'll be wearing a 25" bar .
If you wanna ride to blairsville the first 3 weeks of novemeber you can absolutley do some cuttin with ours.
I may have another squeezed in from brad by then too , blairsville isnt too far west from johnstown.
Might hit one of you guys up on your offers. I'm cutting a piece of timber in sidman...... I can look across the way and see the last mtn you go over on 22 west just before you drop into Blairsville.
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Theres really no wood there that justifies 90cc..but you could get an idea i suppose , A guy by me is startin to do some saw porting after bein into 2 stroke bikes for years..hes gettin pretty good at it and did pretty good on my buddys 661 , If you wanna come down a certain day lemme know and ill make sure to take one if you wanna give it a spin.
This 661 still continues to give me issues. I installed the straight walled intake boot and it still did it. I then replaced the piston to get of the extra intake port timing I had given it by trimming the skirt. It's still doing it. I'm out of ideas. The carb has been swapped. The coil had been swapped. Nothing fixes it. I guess I'm just one of the lucky few. A standard carb goes on next!
Moparmyway
Its just a saw
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Is this the one that is stumbling at throttle tip in ?
Yes. The saw runs fantastic other than this annoyance. It makes great power, great torque, great RPMs... It's just this one annoying thing, and it doesn't do it all the time.
porsche965
Addicted to ArboristSite
Plug wire or connection?
redbull660
Addicted to ArboristSite
you have to upgrade the software on the 661 to windows 10 ...worked for me! i swear 
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