Oil mix ratio.

[Huskybill]

Husqvarna states for heavy duty use a 33:1 ratio is recommended for models above 75 cc. I’m not far off at 38:1. I never wore out a new saw running them for decades. Never fouled plugs, carb adjusted correctly. I run everything at 38:1 husky oil.

Read this below,
https://www.husqvarna.com/au/forest/when-working/usage/how-to-mix-2-stroke-fuel/

 

[holeycow]

Pretty much 32:1. The standard for many years following 20:1....

 

[J D]

Interesting that they recommend E10 but not premium/high octane fuel. Also that both their oil offerings are semi-synthetic.
At one point in time Husky manuals for the same product would recommend either 32:1 or 50:1 depending on what part of the world you were in.

 

[holeycow]

Based entirely on "the environmental" regs

 

[Huskybill]

I wonder if the wornout main bearings and cylinder/ piston scoring is due to not enough oil? Bigger cc’s, more heat from longer bars. Has all the factors combined.

 

[Huskybill]

Based entirely on "the environmental" regs

The only time a forest ranger checked me was if all my saws had spark arrestors.

 

[holeycow]

That's about all they generally care about. Which is entirely understandable.

4 strokes are a bigger fire hazard than 2 strokes by far.

 

[holeycow]

I wonder if the wornout main bearings and cylinder/ piston scoring is due to not enough oil? Bigger cc’s, more heat from longer bars. Has all the factors combined.

Yes it is, together with strato cylinders and lean-from-factory tuning.

 

[North by Northwest]

Another oil thread , things must be really dull in the political forum ?

 

[Huskybill]

Read the part from husky I posted, or I wouldn’t of posted just an oil thread. Changing the oil ratio.

 

[North by Northwest]

Read the part from husky I posted, or I wouldn’t of posted just an oil thread. Changing the oil ratio.

Yeah back in the day oil ratio's became more fat the bigger the displacement . 32:1 125 cc , 20:1 250cc & 16:1 500 cc , this was in motorcycle racing scenerio,s were the belief that more horsepower could be realized due to better ring sealing via the extra oil . However with todays better synthetic oil i think were discussing environmental politics vs actual engine mortality !

 

[giver]

I've always put 200ml of Stihl oil in 17 liters of gas so that's like 43:1 I guess? And never had any issues but sharp chains and clean saws make more of a difference than 40:1 vs 50:1 IMO

 

[sean donato]

Im in the 40 to 1 band camp as well. Never thought 50 to 1 was enough but I do find it interesting that husqy reccomends 33 to 1 for 75cc and larger saws. I may have to reconsider my mix ratio....

 

[Cycledude]

I’ve been using 50-1 since the 70’s and it’s never caused me any trouble, but I’ve never owned a 75cc saw.

 

[Lee192233]

Oil thread!

 

[Chevboy0167]

Currently putting a carb kit, fuel line, and exh. port cleaning on an OLD Earthquake auger. Has a 49cc Tecumseh engine and Tec. fixed jet carb.

Sticker on recoil housing calls for 24:1!!!! 2 ring piston with gobs of compression with no visible wear on intake or exh. side ports. Even the plug has a nice cardboard color with very minor carbon buildup. Surprised the h#ll out of me really!

 

[tomalophicon]

Your link mentions Opel fuel but I'm not sure what that is. Any idea?

 

[Dennisthemenace]

Husqvarna states for heavy duty use a 33:1 ratio is recommended for models above 75 cc. I’m not far off at 38:1. I never wore out a new saw running them for decades. Never fouled plugs, carb adjusted correctly. I run everything at 38:1 husky oil.

Read this below,
https://www.husqvarna.com/au/forest/when-working/usage/how-to-mix-2-stroke-fuel/

E10 "recommended"? I suppose they have to say that

 

[J D]

I'm guessing that recommending it keeps carb sales up

 

[Bwildered]

Im in the 40 to 1 band camp as well. Never thought 50 to 1 was enough but I do find it interesting that husqy reccomends 33 to 1 for 75cc and larger saws. I may have to reconsider my mix ratio....

Got to try and stop them blowing up somehow.