Various Stihl 661 models - what are the differences?

[Howard Justice]

Can some one please point me to web site or elsewhere to learn all the differences between the various 661 models 661c, 661 cm, 661 magnum, etc. Thank you!

 

[cscltd]

Not sure of the difference other than adjustable carb or mtronic.
but you want to stay away from first Gen that were I think recalled in USA. -but not all were -someone may have more info on that. here in Canada we got 2nd Gen. but I think you Can change module to 3rd Gen which cured a lot of issues with them

 

[Howard Justice]

Thank you! Do you know years that were 1st Gen?

 

[huskihl]

661c and cm are the same thing. A “C” is a “CM”. They’re Mtronic. Any coil later than (above) 4700c should be trouble free.

A plain 661 has an adjustable carb

 

[Howard Justice]

Thank you. We seldom use our 661C. Prolly should just sell. And yes you’re absolutely correct. Pulled It off shelf. C=CM….. after reading more here prolly been better to have bought adjustable carb 661.

 

[sean donato]

There's nothing wrong with the current version mtronic.

 

[sawmill sam]

There's nothing wrong with the current version mtronic.

I agree. I have 3 661cm's and have had good luck with all 3.

 

[Lightning Performance]

661c and cm are the same thing. A “C” is a “CM”. They’re Mtronic. Any coil later than (above) 4700c should be trouble free.

A plain 661 has an adjustable carb

As I undestand it the cylinders all interchange. Could be wrong there idk.

Can a carb saw or Mtron be built from the same cases?

 

[huskihl]

The cases are the same I believe and parts can be bought to convert them, but the parts are expensive