MS660 fuel-oil mixture

[Ron660]

I have a factory MS660 which the manuel recommends a 50:1 fuel to oil mixture. I'm currently using the Stihl HP ultra mix at that ratio. Would it be beneficial, engine protection or performance, to mix richer? Also, if I mix richer would I have to adjust my carb and at what ratio? Thanks, Ronnie

 

[jwill]

In a nutshell, yes and yes.

 

[John R]

I've been running all my saws, weed eater, and blower on 50:1 with Stihl Ultra ever sense they were new without any problems.
They are all Stihl products.

 

[mdavlee]

I would go to 40:1 at least.

 

[KenJax Tree]

We run all saws from a 395xp down to a MS 200T at 40:1 with no problems. With more oil the mix will be richer but the saw will actually be leaner because the mix will contain less fuel and more oil so you're gonna need to turn the H screw CCW to get more fuel. Make sense?




Sent from my AutoTune carb

 

[fuzz1500]

These guys on here have converted me over to 40:1 . Maybe someday ill grow up and go 32:1

 

[1Alpha1]

I run all my STIHL machines at 40:1 and I use the STIHL Ultra oil.

And no, I didn't have to mess with the carb screws.

 

[redfin]

Good read, if you haven't already.

http://www.arboristsite.com/communi...-1-mix-requirement.247781/page-4#post-4594888

 

[z71mike]

Oil threads are the best!

 

[shutup-n-cut]

opcorn:

 

[nk14zp]

40:1 to 32:1

 

[redbull660]

lotta guys say 40:1 lotta guys say 50:1 I just split the difference and went 45:1 lol

 

[Muzencab]

After building a chainsaw I run it 30:1, adjusted as KenJax stated, until I get that hiccup when the ring seats, then 40:1 and readjust.
I'm no ologyst. I do like watching guys like Tin Man and Walker.

 

[Ron660]

As of now everything gets Motul 710 non-ethanol 93 octane at 32:1