661 Oil Test 32:1 vs 40:1 vs 50:1 ?

[KG441c]

Ill stick with h1r 32to1

 

[bwalker]

H1R always required some odly different carb tuning to run right compared to other oils. Hence I lost interest in it sometime in the 90's. It also was on the dirty side.

 

[KenJax Tree]

The biggest mess was on my 201T, possibly because it never really gets real hot. It gets started and makes a 30 second cut and then gets shut off for a few and restarted for another 30 second and so on all day. I guess it just comes down to preference and i prefer not to have all the goo.

 

[bwalker]

You shouldn't have goo assuming the motor has a decent transfer port layout and is tuned properly. SOME stihls just suck in that respect and burn dirty no matter what .

 

[KenJax Tree]

I have no idea how the transfer ports are laid out, all my saws are stock other than muffler mods and some with advanced timing. Maybe that has something to do with? Maybe not. I can't tune my Autotune saws and i doubt my top handles get hot enough for the 525° flash point. Maybe its better when making long bucking cuts or milling??

 

[MustangMike]

Perhaps the reason for the difference in these tests is the M-Tronic, and a stock saw. It is designed to run w/50:1.

 

[STIHLTHEDEERE]

I had a very interesting conversation about this thread with one of my senior techs. he has been a stihl tech for 20yrs., and a lawn and garden mechanic since i was a little tyke running around the shop. he has very strong relationship with a few people at Va. Beach. he says when they first started pushing ultra and testing/running m-tronic they quickly learned a few things. most importantly, m-tron is/was engineered/designed to perform best and give the longest engine life @ 50-1. specifically on the 441 carb vs. the 441 m-tron, the engine life was no less than 30% longer. not sure where the ms280 came into the picture,as it was definately before the 441c. he also said that while ultra is bottled by an outside vendor, it is designed to give the best performance/service life at 50-1. stihl cool-aid or not, who knows?

 

[blsnelling]

Andre, my first thoughts were along the same line as yours. I'm wondering if the results had more to do with MTronic than anything else. MTronic is aweful nice for a dedicated work saw, but I still like to be in control of the carb on my saws.

 

[STIHLTHEDEERE]

here is more fuel for the fire. answer this: temp today was 45 degrees, ran the 241c, 261c and the 2260/2253 at 40-1 ultra and e-free gas. the stihls' ran ok, and the jonsereds ran just ok, but seemed to stumble a little, maybe even hesitate. none of the saws were a 100%. dumped all the gas, switched everthing to moto-mix, all saws ran like scalded dogs. it was like a night and day difference. what is the deal? do the new m-tron/autotune saws really like 50-1 better?? i would to like to know. all i know is from now on it will be moto-mix in all saws.

 

[mdavlee]

here is more fuel for the fire. answer this: temp today was 45 degrees, ran the 241c, 261c and the 2260/2253 at 40-1 ultra and e-free gas. the stihls' ran ok, and the jonsereds ran just ok, but seemed to stumble a little, maybe even hesitate. none of the saws were a 100%. dumped all the gas, switched everthing to moto-mix, all saws ran like scalded dogs. it was like a night and day difference. what is the deal? do the new m-tron/autotune saws really like 50-1 better?? i would to like to know. all i know is from now on it will be moto-mix in all saws.

Fuel could be stale or bad. I've had a couple gallons of gas I had to toss out. It wouldn't run in any saws.

 

[Sagetown]

Whats confusing Keith? I mixed 5 gallons of fuel with 800 2T for my saws and after using 2 gallons i decided to use the rest in my dirt bike. I will just keep using Lucas for my saws like i was.

I'm going with Lucas, but not as heavy mix as you are mixing. Somewhere between 42:1 -> 50:1. I only use my saws around the ranch.

 

[KenJax Tree]

I'm going with Lucas, but not as heavy mix as you are mixing. Somewhere between 42:1 -> 50:1. I only use my saws around the ranch.

You'll be more than happy with it. I could get away with mixing 36:1 or 42:1 (3oz or 3.5oz) i just mix 32:1 (4oz) to keep it simple.

 

[Sagetown]

You'll be more than happy with it. I could get away with mixing 36:1 or 42:1 (3oz or 3.5oz) i just mix 32:1 (4oz) to keep it simple.

Anything below 40:1 just seems a little too heavy concentration to me, but then, what does a farmer know...

 

[KenJax Tree]

Anything below 40:1 just seems a little too heavy concentration to me, but then, what does a farmer know...

Yeah 32:1 is probably overkill in my saws but it burns clean, don't get gooey, leaves a nice blue film of oil, and the extra protection is there.

 

[Sagetown]

Yeah 32:1 is probably overkill in my saws but it burns clean, don't get gooey, leaves a nice blue film of oil, and the extra protection is there.

Yeah; I can understand your concern for all day, everyday usage. Can't make a livin' burning up saws.

 

[blsnelling]

I don't understand this talk of oily and gooey mufflers. When tuned correctly, I simply haven't found this to be an issue.

 

[Sagetown]

I don't understand this talk of oily and gooey mufflers. When tuned correctly, I simply haven't found this to be an issue.

If you were getting that goo, would you lighten up on the oil??

 

[KenJax Tree]

Can't tune an Autotune saw Brad.....my 201T isn't really an issue Stihl top handle clutch covers all turn black anyways

 

[blsnelling]

Can't tune an Autotune saw Brad.....my 201T isn't really an issue Stihl top handle clutch covers all turn black anyways

This is true. Perhaps MTronic runs rich.

 

[redbull660]

well I can try 50:1 vs 32:1 and do the reset thingy on the 661 and see what happens. Someone gotta buy some of these chains though so I can keep this testing going.

I could also do the 660 and do 50:1 vs 32:1