MS261CM M-Tronic Issues and Many GFY’s

[Redbull661]

That’s strange for me.

Both my 362 & this 261 didn’t seem to mind?


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From what I've seen it depends on the oil. For example, they run fine on schaeffer 7000 and 9000 32:1. (all scott uses is 7000 32:1...so all saws tested on it). I have had similar issues with R50 as well. Also, yeah Motul is thicker stuff than RA.

 

[Duane(Pa)]

Me three, but 28 could be too wet...

 

[hseII]

From what I've seen it depends on the oil. For example, they run fine on schaeffer 7000 and 9000 32:1. (all scott uses is 7000 32:1...so all saws tested on it). I have had similar issues with R50 as well. Also, yeah Motul is thicker stuff than RA.

Thank You.


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[Mastermind]

I normally run non E 87 with Yamalube 2R @ 40:1

 

[hseII]

From what I've seen it depends on the oil. For example, they run fine on schaeffer 7000 and 9000 32:1. (all scott uses is 7000 32:1...so all saws tested on it). I have had similar issues with R50 as well. Also, yeah Motul is thicker stuff than RA.

So,

Which 7000 Schaeffer?

On Amazon all I see is 4 stroke weights?

It’s Synthetic? Boo Hiss.


We used to buy Schaeffers diesel engine oil by the drum when we were in the chicken business.

Dad got hooked up with a supplier. The engine oil we used was good stuff.


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[hseII]

I normally run non E 87 with Yamalube 2R @ 40:1

Whale you’re North of me so Mayhaps RA @ 32:1 will be skinny enough.


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[huskihl]

I'm having the same exact issues. MS261c with 16" bar under a good load. 32:1 with dolmar synthetic and 90 e free. The plug is getting so hot it's pre-igniting. The only time I've ever had this problem was a few years ago with stale ethanol fuel. I haven't picked up new fuel yet to check.

It's not a broad mtronic or autotune failure. I've recently ported 550's, 562's, 241's, 261's, and 661's with no issues. In the past, I haven't had issues with the 90 e free 32:1 recipe.

 

[hseII]

I'm having the same exact issues. MS261c with 16" bar under a good load. 32:1 with dolmar synthetic and 90 e free. The plug is getting so hot it's pre-igniting. The only time I've ever had this problem was a few years ago with stale ethanol fuel. I haven't picked up new fuel yet to check.

It's not a broad mtronic or autotune failure. I've recently ported 550's, 562's, 241's, 261's, and 661's with no issues. In the past, I haven't had issues with the 90 e free 32:1 recipe.

Thank You SF.


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[Onan18]

Try 40:1 bud, I have seen several AT/MT saws go stupid on thicker mix.

 

[Mastermind]

Whale you’re North of me so Mayhaps RA @ 32:1 will be skinny enough.


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In my not so humble opinion, 40:1 will provide plenty of oil. But hey, you do what give you a warm and fuzzy feeling.

 

[hseII]

In my not so humble opinion, 40:1 will provide plenty of oil. But hey, you do what give you a warm and fuzzy feeling.

I’m sure it will.

As you know I run a bunch of different saws from different eras, & I prefer to keep everything on 1 mix.


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[Duane(Pa)]

Slap a can of trufuel 40 in. Quickest way I know of to rule out fuel.Takes the pump factor out too...

 

[Stump Shot]

I’m sure it will.

As you know I run a bunch of different saws from different eras, & I prefer to keep everything on 1 mix.


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So do I and I do so with a 40-1 mix for everything anti-Q to present and all in between.

 

[Mastermind]

I’m sure it will.

As you know I run a bunch of different saws from different eras, & I prefer to keep everything on 1 mix.


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40:1 will do that just fine. Like you, I run a mix of old, and new saws. 40:1 fits the bill perfectly.

 

[luckydad]

I’m sure it will.

As you know I run a bunch of different saws from different eras, & I prefer to keep everything on 1 mix.


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You know all the saws that are on my truck, 40:1 RA for everything except the small saws they go at 50:1 per Randy’s recommendation.


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[drf256]

Will try 40:1 RA with E free as first test.

 

[Wonkydonkey]

An interesting thread doc. Very interesting indeed.

Maybe a few too many large sandwiches added to the picnic, could be time to go back to smaller sandwiches.

I Really like your threads of your perfection,

And your attention to your work perfection.

Cheers.

 

[redline4]

So the M-tronic's have a temp sensor?
Where is it located?

Dont mind the stupid questions, as I once picked up an M-tron at a dealer and put it back down. Never ran one.

 

[huskihl]

So the M-tronic's have a temp sensor?
Where is it located?

Dont mind the stupid questions, as I once picked up an M-tron at a dealer and put it back down. Never ran one.

On the coil

 

[redline4]

Thanks Kevin.

Another stupid question then, could coil air gap then affect coil temp?
Hotter spark, more induced heat?

Im just thinking on my mower engine days, we ran billet flywheels with rare earth magnets and gaps were .040-.060" and changing it was enough to alter cylinder head temps with no other changes.