What oil is best? and what ratio?

[so il logger]

GuessI should try 32:1 before I knock it but 40:1 is plenty sufficient... These pro grade saws available nowadays are tough. I have seen a guy put oil in gas tank and ran it until it died. Refilled with gas and ran fine. I personally had a saw fall into a river while it was running. Drained it, and it ran again and made my living for another year. When my dad started falling timber they mixed non detergent motor oil with gas. It worked for them. He also says mosquito's left them alone lol

 

[Keith Gandy]

Mtronics ..?????
WTF is Mtronics ??

Carb?

 

[junkman]

It will be lean going 32 to 1 make sure to riches the h needle a little bit

 

[Moparmyway]

GuessI should try 32:1 before I knock it but 40:1 is plenty sufficient... These pro grade saws available nowadays are tough. l

If you're comfy with 40:1, there really isn't any reason to change. I run 32:1 because I'm to stupid to try 40:1.

I believe that 25:1 in my high heat stumpers is cheap insurance

Carb?

She is now, and she is going to stay that way too !!

She ran very well with Mtronics after porting, but she picked up over 500 rpm in the cut with the WJ69 and regular coil ........... And they were the only 2 things that were changed for that comparison

 

[Keith Gandy]

If you're comfy with 40:1, there really isn't any reason to change. I run 32:1 because I'm to stupid to try 40:1.

I believe that 25:1 in my high heat stumpers is cheap insurance


She is now, and she is going to stay that way too !!

She ran very well with Mtronics after porting, but she picked up over 500 rpm in the cut with the WJ69 and regular coil ........... And they were the only 2 things that were changed for that comparison

Ive never ported a 661. Is it the same quad cylinder as the 461 setup?

 

[Moparmyway]

Yuppers !

 

[Keith Gandy]

Yuppers !

So when u swap the coil thats nulls all the Mtronics?

 

[rogue60]

Mtronics ..?????
WTF is Mtronics ??

I've only had experience with Mtronics on the 661 and get what your saying ,don't get me wrong from what I have read Stihl has gotten the tune on smaller cc saws closer to on the mark as far as Mtronics and tune go?..
The tune on a 661 is close and does the job but dam if you know how to tune a saw there will be many times in a working day you will be thinking- IF only I could tune this thing! kind of frustrating really...IMHO

 

[jake wells]

I've only had experience with Mtronics on the 661 and get what your saying ,don't get me wrong from what I have read Stihl has gotten the tune on smaller cc saws closer to on the mark as far as Mtronics and tune go?..
The tune on a 661 is close and does the job but dam if you know how to tune a saw there will be many times in a working day you will be thinking- IF only I could tune this thing! kind of frustrating really...IMHO

they tune ok with a sledge hammer.

 

[Moparmyway]

So when u swap the coil thats nulls all the Mtronics?

The Mtronic coil has the brain, the Mtronic carb has the solenoids ................

I swapped the Mtronic coil for the Euro coil
I swapped the Mtronic carb for a WJ-69 (with a 74 jet)

 

[rogue60]

Lean there are many ways to get there...
One way and probably the most insignificant is the good old line if there is more oil in the fuel so less fuel is getting into the guzzoline machine thanks to the oil taking up more space in the fuel =lean that's one way for sure,but most take lean in a saw = as in tuned lean is my hunch?..
True the more oil thing but is it even humanly measurable how much more space the oil takes up going from 40:1 to 32:1? it's on a microscopic level in reality, sure the tune will be out some but its not like it's going to blow up in seconds is it? or am I missing something?.
The word lean holds so much weight when used in the world of two strokes.. Just an observation and not having a go at anyone and I don't read anymore into it the good old more oil = lean, but many will/and do. guess that's why they give us the ability to tune a saw or used to and slowly they be taking that off us even .
You see it here and there on chainsaw forums guys all hung up on this fact having a little melt down (not here ) telling guys putting more oil in da mix is bad! it will be lean and therefore said saw will blow up big time! technically speaking they are wright (the lean part on a microscopic level but not the blow up part) and how could one argue anything less when its kind of true but kind of in a insignificant way lol...its different reading that's for sure ...just my 2c.

 

[Moparmyway]

Its all in the tune

Extra oil
High flowing (or no) filter
Ported
Muffler mod

Its all in the tune

 

[bwalker]

Mtronics liking kl200 at thoso ratios?

My 562 has worked fine at 20:1. And if a electronic carb cab compensate for an 80 degree or more swing in temps a change in oil ratio should be no issue as the change in fuel flow is much less.

 

[bwalker]

It will be lean going 32 to 1 make sure to riches the h needle a little bit

Very slight differance.

 

[bwalker]

Its all in the tune

Extra oil
High flowing (or no) filter
Ported
Muffler mod

Its all in the tune

Tuning a two stroke motor properly is something lost on most people.

 

[bwalker]

I've only had experience with Mtronics on the 661 and get what your saying ,don't get me wrong from what I have read Stihl has gotten the tune on smaller cc saws closer to on the mark as far as Mtronics and tune go?..
The tune on a 661 is close and does the job but dam if you know how to tune a saw there will be many times in a working day you will be thinking- IF only I could tune this thing! kind of frustrating really...IMHO

My perception is Autotune works much better than M-Tronic. However, I only base that on a friends 362 and what I have seen on these boards with 661's.

 

[junkman]

Very slight differance.

I saw a 600 rpm increase on my tach switching from 40 to 32 to 1 ,yes slight but it was there ,depending where the tune is at it may just feel like it picked up a little power ,i tune one of my saws about 14800 so the 600 rpm increase is noticable

 

[bwalker]

I saw a 600 rpm increase on my tach switching from 40 to 32 to 1 ,yes slight but it was there ,depending where the tune is at it may just feel like it picked up a little power ,i tune one of my saws about 14800 so the 600 rpm increase is noticable

I have noted a greater change with a 30 degree swing in temps.

 

[bwalker]

One other thing to consider. Using an oil like H1R which has crap combustion characteristics will complicate tuning more when lowering oil ratio.
OTOH a good tuning oil like 2R, K2, etc will tune easy down to 16:1.

 

[bwalker]

Thanks for this, Ben. I just opened the link and told the browser to find the word "oil" (cmnd + F on a Mac). There's 91 instances where Mr. Hall talks about oil. Using the find function makes it easy to jump from one to the next. Here's another that caught my eye:

I was declared a idiot when I mentioned a properly tuned motor should show a piston covered with a light layer of carbon with a bit of wash where the ports discharged. The "my piston is bare metal" crowd just couldn't grasp it!