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I bought a Still 041AV back in 1967. The mixture recommended in the manual said 40:1 . I have been using that ratio all along for 57 years and other than replacing the carb and spark plugs a few time, the saw still runs great.

The likely answer as to why chainsaws run hotter with more oil in the fuel mix is because oil is replacing gasoline and the gasoline burns more efficiently to produce power. What's important here is not that the temperature is higher, but rather do the hotter operating temperatures reduce the life cycle of any components? And I would surmise that only the manufacturer can make that determination. But I will give the audience an important fact. One that was not presented in this video. Still says to use a 25 to 1 fuel mix ratio if one does not use stihl oil in the oil mix. Don't believe me? Read the owner's manual. Thank you for a very informative test.

Great breakdown,worth watching to the end...my 2 cents is,I had a spark plug that sparked really well,but did not start,replaced plug and it's back to new,this has only happened to me twice in 60 yrs....they are frustrating at times...

Just use ams Sabre 100 to 1 , works great with a cooler running motor.

I run all my saws at 40-1

How to make it get corent

How to make it get corent

Great experiment! Another problem with using extra 2-cycle oil is the increase in carbon particles in the cylinder. That would probably cause extra wear.

I did exactly this for my stihl and it worked prefect after. Thank you for the video

I buy the 40:1 premix at Lowe’s. Seems to work great for me.

No issues with 1:50....

Can be use on boat de watering?

Coolness!

More oil also probably means more carbon deposits.

Over time it will run hotter because with the richer mixture you will plug up the spark arrestor

Even if it is true as you say, a small increase in temperature is Not detrimental to engine wear and longevity, but an underlubricated engine certainly will increase its wear and reduce longevity. Also, for the test to be valid the chain should have been re-sharpened and the carby mixture adjusted more richer to comensate for the extra oil content, air being the same density assumed.

Im a 40:1 kinda guy. I run 40:1 in my stihls and husqvarna saws and my echo weedeater and blower. Figure a little bit of extra oil would be beneficial.

TO MUCH OIL WILL KILL THE POWER AND SOOT UP THE MUFFLER.MIX IT RIGHT AND DONT IDLE IT AS IT CUTS THE AIR FLOW.THE FASTER IT RUNS THE COOLER IT WILL RUN,IF ITS PROPERLY CLEAN.50 YEARS EXPERANCE

Thanks Dave, Just picked one of these up at a garage sale in Canada for $50 Candian ($36.50 US). Started right up and works great for a light weight blower. Looked on line and found there was a recall for a fire hazard. Will have to check the serial number to confirm before using. Maybe that's why the good price. Appreciate the video.

Tell me you don't live in an HOA without telling me you don't live in an HOA... Proceeds to run a leaf blower outside at wot at night. 😂

Yes I don’t care what you say MORE LUBE BOYS

I have an FS40STIHL WEED EATER I NEED TO know how to get the Flippin back off to change purge bulb

25:1 is a mix you would have seen for older engines from the 70’s…most 2-strokes are 50:1 today…better gas, better oil, better engines!…gone are the days of mixing in what ever oil you had kicking around and what ever volumes and mixes…these new engines don’t like those “guess-a-gas” mixes from back in the day!..lol!!

Running temp has a lot to do with the adjustment on the carb. 25:1 needs to have the carb turned more rich to make up for the lower gas comtent (almost half). Otherwise you'll run lean by switching, which will run hotter. The carb needs to be properly adjusted any time you change the fuel mix.

If you want your 2 cycle engine to last the longest time possible, use Saber racing oil by Amsoil. They will guarantee their product in your engine clear down to 100:1, & it is pretty easy on the nose and especially on the wallet. I have been running all my equipment at about 85:1 for about 7 years now, mixed with non-ethanol 90 octane fuel with ZERO issues ( other than saving money!! )

Stihl recommends with a genuine stihl oil 25/1 with a non stihl oil 50/1. If you wanted to be completely fair a fresh sharp chain for the second test maybe 😅 I think my saw would have cut through that log in half the time

A hotter running motor makes more power

Using more oil will cause more carbpn buildup.

25:1 is a bit crazy. I think maybe 40:1 might have been a better test

I was just wondering that I have a FS 38 start for a little bit and it will die and sometimes it will backfire I bought a brand new carburetor and I looked at the the fuel filter that's okay and I don't know what else it would be I just wanted some suggestions

I would think the 104-110 ml would be a helpful failsafe for Stihl. Most gas pumps are not going to stop at exactly 5 liters or even 1.0 gallon. I personally stop pumping at .9 gallon and my mix is plenty rich and I have never lost any 2 cycle or 4 mix piece of equipment. Thanks for the video.

I guessed higher temperatures with higher oil ratio. The hydrocarbons in the oil are of much longer chain length and hold more energy in their bonds which gives off a greater enthalpy of heat when combusted. Same story with petrol vs the longer chain diesel. Diesel gives a hotter burn, more energy in the bonds of the longer hydrocarbon. There would be more carbon build up in the engine with 25:1 vs 50:1. Both mixtures do still work, but it's evident that 25:1 is an unnecessarily rich mixture.

I would also think the more oil would foul out the spark plug.

Yikes! Sharpen that chain.

If these saws have the easy start system why do you yank the rooe

Fish pleeese

Thank you for sharing…

I have a k770 just put a new carb on it and it seems to smoke quite a bit. Is there any adjustment on these carbs? Or is there something else I should check?

Sharpen that chain

Its funny how many people think they know more than those that designed the machinery. If Stihl says 50:1 then guess what? I always try to add a tad more because you never want to be short but i wouldnt be aiming for 40:1.

3 year old video, and it helped with the exact problem I had. Thanks so much!

Mmm Koolaid. I'm choosing the Red Armor because it looks tastiest. Oh yeah!

Been running two strokes for 40 years. There’s a big difference between brands, not just what specification they conform to but how much oil is maintained in the crank, how much carbon builds up, whether the oil burns or leaves the combustion chamber as an oil. Sadly some of the more expensive oils leave more carbon in the combustion chamber and in my experience damage caused by excessive carbon is a common cause of piston and cylinder damage.

I bought the same tank after old one failed but it was easier for me to install because new one was pretty much same as old ..i didnt have to make adjustments to install it..i didnt know you can replace the 4 screw mount tank with one with 2 screws...that was educational .. thanks

Excellent content, great edit...helped get my FS131R starting easily again... thanks!

The extra heat is a small worry to me. It the extra carbon build up it will to. It could drop carbon deposits in the cylinder and score the piston and cylinder.

I have noticed it too and pre-measure before mixing for 50:1 everytime. Too much oil bogs the chainsaw down, decreases horsepower, fouls the plug, combustion chamber, piston top and muffler. Thank you for the confirmation and great video.❤

Opti-2 in the small packs. Easy starts. Low smoke. No issues. That's all I use.

13:36 Please can we use the oil for motorcycle to mix the mower fuel?

13:36 Please can we use the oil for motorcycle to mix the mower fuel?