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

[KenJax Tree]

Or just the ratio in need of tweaking a bit

40:1 with Lucas isn't too much[emoji6]

 

[Trx250r180]

42:1 thinking I might bump up to 45:1 ? to me it seems just a touch rich?


question: do u guys think that a muffler mod could play into how much oil I need in the mix?

I've been running this saw with the opened up muffler (exit port) since day 1.

The more you open the muffler ,the cooler the exh temp will be so yes ,i bet with stock opening you will not have a damp can if you try it .

 

[porsche965]

Wouldn't the Mtronic adjust for any muffler mods?

 

[bwalker]

40:1 with Lucas isn't too much[emoji6]

I'd never tweak oil ratio to get a motor to run clean.

 

[Ron660]

this 661 was broken in and run on h1r. This is approx 9-10 tanks.

exhaust port - slight brownish but still transparent discoloration

top of piston - very very thin layer...hard to see exactly. There is a difference where the transfers are

my only concern is the area just above the top ring (between piston top and top ring) - some brown.


Guesses at the ratio i've been running?

Piston and rings look dry to me?? No oil film.

 

[porsche965]

42:1 thinking I might bump up to 45:1 ? to me it seems just a touch rich?


question: do u guys think that a muffler mod could play into how much oil I need in the mix?

I've been running this saw with the opened up muffler (exit port) since day 1.

***********

With a thicker quality oil wouldn't you find more HP at 50:1?

Don't fear, you have the Mtronic management on your side

 

[Moparmyway]

I've been running this saw with the opened up muffler (exit port) since day 1.

 

[bwalker]

Muffler mods can effect scavenging in a negative way if over done.

 

[KG441c]

2r in 440

 

[KenJax Tree]

32:1?

 

[nitehawk55]

Wouldn't the Mtronic adjust for any muffler mods?

This would concern me . I have guys saying modding M-tronic type systems works good or is there an underlying issue that might bite you in the azz at some point in the saws life ?

 

[porsche965]

This would concern me . I have guys saying modding M-tronic type systems works good or is there an underlying issue that might bite you in the azz at some point in the saws life ?

Do "those guys" own M-tronic type systems? Or fully modded M-tronic saws?

I fully trust those engineers with the AT and M-Tronic systems better than myself with that little orange driver.

How many out there go to great lengths to buy an old truck or car with a carburetor?

 

[porsche965]

Question: Does anyone have a good definition of "run on" on an AT or M-tronic saw after a long cut at WOT? --also known as "run-on."

 

[porsche965]

Back to Oil. So it looks like from Red Bull's pics that "rich" seems to be around 40:1 in a M-tron saw.

What do we call 32:1 in an M-Tron or AT saw?

 

[KG441c]

Back to Oil. So it looks like from Red Bull's pics that "rich" seems to be around 40:1 in a M-tron saw.

What do we call 32:1 in an M-Tron or AT saw?

Slow!!!

 

[bwalker]

Back to Oil. So it looks like from Red Bull's pics that "rich" seems to be around 40:1 in a M-tron saw.

What do we call 32:1 in an M-Tron or AT saw?

I don't think Mt has anything with the way his saw looks. MT should work regardless of ratio.

 

[porsche965]

Can't believe I just repped bwalker

Yes it does. But in a specific way.

 

[bwalker]

Can't believe I just repped bwalker

Yes it does. But in a specific way.

Correct me if I'm wrong but doesn't both AT and MT sample rpm and throttle position and adjust accordingly?
Be nice if they had one more input like a o2 sensor.

 

[Hedgerow]

Correct me if I'm wrong but doesn't both AT and MT sample rpm and throttle position and adjust accordingly?
Be nice if they had one more input like a o2 sensor.

The Husqvarna has a 3rd calculation...
It adds magic pixy dust as needed to make sure it's always faster than the Stihl running next to it..
Not sure how those crazy swede's pulled that one off, but damn, is it ever effective...

 

[bwalker]

The Husqvarna has a 3rd calculation...
It adds magic pixy dust as needed to make sure it's always faster than the Stihl running next to it..
Not sure how those crazy swede's pulled that one off, but damn, is it ever effective...

No pixy dust. It's called a better designed cylinder.