Stihl 041 AV from 1963

[youngmaytagstud]

does anyone know the correct fuel mix for this saw. old flat top airfilter. not the farm boss.

[Chisel Tooth]

50 to 1 is the recommended ratio, for all Stihl hand held products.
See Ya
Mike

[Motormowers]

Back in 1963 im sure that saw ran a 16:1 ratio. I dont care how good todays oils are I wouldnt run it leaner than 40:1 or 32:1. The carburation is set up for a heavier mix and wont make the engine run lean like it would do to a new 2 cycle.

[youngmaytagstud]

i agree, i would never run leaner than 32:1 in anything, i dont care what stihl says, they just want you to buy another saw. i work on saws for a living, and ive had to part out too many saws because of scoring. i was just wondering if i should run 16:1. but i think 32:1 with the new oil would be ok and not hurt anything
oil is cheaper than a cyl kit.

[Motormowers]

Well todays oils are much better. I think a 32:1 ratio is perfect for the real old 2 cycles, 40:1 for the new stuff. Obviously if you get a lot of smoke even under load and the muffler is dripping with oil you can cut it back to 40:1. If the muffler is just wet and the smoke isnt bad at 32:1 the I would stay with that. 16:1 is a VERY heavy mix and should be avoided as that was a ratio for oils no longer having those additives and consistancies (thank God).

For what its worth Amsoil has a 100:1 synthetic mix but thats really asking for trouble on old engines with loose clearances.

[Chisel Tooth]

I run my 650 Mac at 50:1 and have done so for over 15 yrs. I've been working on small engines scence the age of 12 and I'm 47 now. Trust it or not but with the modern oils 50:1 works for just about everything. But according to the manufacturer you are to run Castrol SAE 40 mixed at 20:1 with regular gas. I have alot of customers that have older saws and run the 50:1 mix for years and have had no problems.
See Ya
Mike

[Motormowers]

Ive been working on small engines the last 30 years and im 42 now, im also Bronze certifed in Stihl going for silver this year. I really dont think running that ancient saw on 32:1 or 40:1 will hurt,esp with todays quality oils like Stihl and Shindaiwa,etc sell. Oils in dept or parts stores should be avoided. With a 50:1 ratio it doesnt take much of a lean carb adjustment to seize or ruin a 2 cycle if the carb is adjusted wrong or the metering diaphragm is hardened and starves the engine slightly if the saw is being worked hard. In his case of a saw of that vintage they have the torque at low rpms and it puts more stress on the bearings where as the newer saws rev much higher to achieve that torque and have less internal stress as they are happy at those revs and stall when bogged to the rpms of those ancient ones.

[Chisel Tooth]

_I agree it is the fact that the older saws don't run the high RPMs, as the new saws. You want to be sure that the oil you run is a oil classified API-TC,(American Petroleum Institute) JASO-FC,(Japanese Automobile Standards Organization),or ISO-LEG-D,(International Organization for Standardization). ISO specs add to the JASO for the level of detergency protection against rings sticking and varnish deposits.
API-TC is not as ridged as the JASO and ISO requirements. You will learn this at the school in Marble Hill.
_ I'm headed to Virgina Beach to get my gold, sometime this year. I also hold certs. Briggs, TEC, Kohler, MTD, Redmax, Poulan, Shindawa, Echo, Dixie Chopper, Gravely, Ariens same as Gravely, Toro, Generac, and a few others I let expire, I don't work on them anymore, Homelite was one.
_ Good luck at the school, Kick Van Greer in the knee for me. Just kidding. Get them to let you stay in the hotel in town if you can they have a good breakfast bar. Silver takes two days, so don't fall asleep.
See Ya
MIke

[Motormowers]

Mike I wont be going to Virginia Beach until next year for the gold. Just the local CT Stihl distribution center for silver testing for 2 days. I agree they feed you well, but not as good as Exmark does.

[Bruce The Mac Hopf]

http://www.acresinternet.com/cscc.ns...1?OpenDocument
I just looked up your Chain Saw here at this website, and it calls for 40:1. Some Stihl Chain Saws call for 50:1 Not all like someone previously said. I have McCulloch Chain Saws here that were built in 1965, and 40:1 was the Standard Mixture for them then. I also run Stihl Chain Saws as well, and I use Stihl Premium Oil at 40:1 for all my Chain Saws. Even the ones that call for 50:1. 40:1 has a little more Oil in the Mix, and it wont hurt anything. Bruce.

[Bruce The Mac Hopf]

Originally Posted by Chisel Tooth

50 to 1 is the recommended ratio, for all Stihl hand held products.
See Ya
Mike

I think you had better do some Research Mike, and you will find that No All Stihl hand held Products call for 50:1. Very Very Few Stihl Products call for 50:1, but mostly call for 40:1. Bruce.

[bull]

STIHL recommends a 50:1 mix when using STIHL branded two cycle mix oil (2.6 oz. of STIHL branded oil for 1 gallon of gasoline) on all of our gasoline powered equipment.


This is off the stihl web site. At the time stihl switched to te 50:1 mix. They did some testing and had data showing that the head tempiture was reduced using the higher mix.
Marty

[John Marrais]

Originally Posted by youngmaytagstud

does anyone know the correct fuel mix for this saw. old flat top airfilter. not the farm boss.

It's certainly not going to be a 1963. We were selling brand new 040 saws mid 60s. 041 came after the 040. I first went to work as a saw and tractor mechanic mid-60s for a Deere, Homelite, and "oddball" dealer. I say "oddball" because we sold Solo and Stihl before they had any real presence in the USA.

As far as the mix, it based on the oil you're using, not the saw. When Stihl was recommending plain-grade 40 weight motor oil - the mix was 20 to 1. With marine-rated two-stroke-cycle oil - it was 25 to 1. With Sithl-brand two-stoke-cycle oil it was 40 to 1. As far as saws today - I don't pay attention to the new specs since they are partly based on emissions laws - not what's best for the saw.

[Craig A]

http://www.stihl.ca/company_history_prod_1960.asp

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