Post by dando127 on Nov 11, 2021 7:18:15 GMT
thunderhill
From a 292 newbie---------trying to determine the gas oil mix ratio. Old specs lists it at 20:1 I think. I am hearing locally that 50:1 with the new synthetic oils is OK and results in less plug fouling.
Any thoughts on this?
Thanks
292 Newbie
cdem72
I use 25:1 down to 30:1 with modern oil and premium gas. My engine rebuilder says if it's for trail and fun you can go towards 40:1 but if you are going to race at higher rpm stick with a good oil at original spec.
775
Agreed.
Vintage Elan Guy
I have been running AMSOIL Synthetic at 40/1 with Premium fuel in any of my sleds that are fully broken in. I run Shell Advanced petrolem oil at 40/1 in sleds when I am breaking them is. Have not had any issues so far and I trail ride as well as race them.
Whateve4r you choose, buy the best oil that is readily available to you and be consistent when mixing it. Get yourself a good measuring cup and keep it just for mixing purposes for decanting the oil from the bottle.
40/1 is very easy using liters at the pump.
250ML of oil to 10 liters of fuel and so on.
thunderhill
Thank you for the info I'll try using 40:1 with a premium oil and see how that works.
snow4me1
My 79 Elan says right on the recoil to run 50:1. I ran that this weekend but I wonder if that's ok? I used Amsoil Synthetic, it can be run as injector oil or as premix. As a matter of fact, the bottle says to run it at 50:1 as a pre mix. Any ideas or comments?
Daryl
1970TNT
50:1 MIX WAS USED FROM 1974 TO 19?? SO YOU ARE OK. 40:1 IN 1973 AND 20:1 FROM 196? TO 1972. I AM RUNNING 35:1 IN ALL MY PRE 1972 SLEDS.
Bubblenose
20:1 seems ridiculous. Last year I ran 20:1 in all my pre 70's sleds. Tones of blue smoke, and fouled plugs. This year i am running a great oil, and 32:1 ratio. What a great difference !! certainly on the trails! 29 miles last weekend on a 1968 250 and no plug changes. I took the plug out when I got home and it it a nice dry medium chocolate color
Bones
Howdy. My favourite part of resurrecting a old Doo is rebuilding the engine
I am not a racer, just a trail rider but doo know how to pin the joy flipper in the fluff
I would not think of running my old Doo at anything but 50:1 with modern oils but I just have NO LUCK at that mix, just can`t seem to burn down a engine so I can re-Doo it
Also, dang I save a few bucks on oil & I don`t need to have a sleigh full of spark plugs in tow.
A few years ago I rebuilt a `74 - 440 FC T`nT, converted it to a Mikuni carb, always run it at 50:1. Never changed a spark plug for over 2,000 miles , but the plugs aren`t NGK either
It still runs just fine.
Bones
snow4me1
What octane fuel should be used, 87,89,91,93 or even 94? Stock 79 250
Thanks, Daryl
pmhvps
Talking to an old mechanic over the holidays and the subject of old engines, old bikes and old snow machines came up.(ya, talking about everything) He, basically said, the older (50's, 60's and 70's) engines were not designed to run on synthetic oil and will shorten the life.
Mike.
snodrifter
I think that the "OLD" mechanic needs some updating. Damn this new-fangled tech.
73ss_elanman
I'm with bones. The only times i've had to change a plug were when I replace them at the start of the season. I buy a new plug for every cylinder every year, and just replace it each fall as a reliability factor. No problems as of yet,
running at 50:1 with 2 stroke oil, sometimes it is expensive snowmobile oil, sometimes it is 2 stroke weed eater oil, some times it is mercury outboard oil.
most of the time it is the cheap canadian tire moto-master brand snowmobile oil or castrol super.
mixed with regular gas.
320Racing
We race a 292, 320 and 335 and mostly run them at 32:1-40:1 Polaris Blue oil. Personal opinion, we also put in Lead Additives since the fuel now-a-days is unleaded.
Built to run on lead, keep em runnin on lead. Runs cooler and more lube. Thats what we do and dont have as many breakdowns. Happy riding!
Pa Poidy
Hi 320
I agree, we should be looking at the non lead, lead more than mix ratio [n older sleds, I am not in favor of synthetics, they seem not to use them until after break in period
cdem72
I squeaked my elan blizzard motor using 30:1, 91 octane premium on a -7 C day with the hi speed set a snib too lean! My motor guy had a look and said damage is minimal but the cylinder/piston looked like they got a little too hot and maybe was lacking oil. A slight hone, clean up the piston and grooves and dress the rings and it will be back in shape. I think I'll be running 20:1 with premium and a richer hi speed for sure! But that 246 bored to a 292 ate my 440 T'NT for lunch; I just want it to survive!
Bubblenose
Wow...and it was that cold??
nasty2fifties
cdem - I've had 71's, 72's, and 73's. Now I have a73 250T and three 73 SS's. I had never even heard of an elan blizzard until I saw yours. Last weekend I was buying some elan parts from a guy and he had one, so I got to see it in the flesh. Not much room for your feet with that big pipe! What is the HP on that big 292?
cdem72
Nasty2fifties: The stock 246 is supposed to be 29 hp and the 291 is supposed to be 31 hp. I had it dyno'd and it tested 29 hp, and should have quit while I was ahead! LOL! But I fiddled with it a bit after I got the motor back and I'm sure it was pulling harder but it was a little too lean. I have been advised to keep it as rich as possible, at the point where it just starts to pull hard, even if there seems to be a bit more to go on the hi speed adjustment. Check out my web page, "Colin's Vintage Ski-doo's" at Imagestation.com as I have some more pics of the elan blizzard under construction and some video. PS, it was running OK last year but would drop revs under full throttle. But once I installed the original blizzard clutch it was a totally different sled, high rpm engage and peak revs equals a little screamer that ate my '71 440 T'NT for breakfast. PS, that tuned pipe was not gentle to the top of my boot and bottom of my pant leg!
DooNoob
every sled i've ridden i have used 50:1 in it and have not had any issue whatsoever other than possibly the lines aging just slightly quicker than the people i know who run 30:1 but they also seem to have plug fouling problems. i swear by 50:1
From a 292 newbie---------trying to determine the gas oil mix ratio. Old specs lists it at 20:1 I think. I am hearing locally that 50:1 with the new synthetic oils is OK and results in less plug fouling.
Any thoughts on this?
Thanks
292 Newbie
cdem72
I use 25:1 down to 30:1 with modern oil and premium gas. My engine rebuilder says if it's for trail and fun you can go towards 40:1 but if you are going to race at higher rpm stick with a good oil at original spec.
775
Agreed.
Vintage Elan Guy
I have been running AMSOIL Synthetic at 40/1 with Premium fuel in any of my sleds that are fully broken in. I run Shell Advanced petrolem oil at 40/1 in sleds when I am breaking them is. Have not had any issues so far and I trail ride as well as race them.
Whateve4r you choose, buy the best oil that is readily available to you and be consistent when mixing it. Get yourself a good measuring cup and keep it just for mixing purposes for decanting the oil from the bottle.
40/1 is very easy using liters at the pump.
250ML of oil to 10 liters of fuel and so on.
thunderhill
Thank you for the info I'll try using 40:1 with a premium oil and see how that works.
snow4me1
My 79 Elan says right on the recoil to run 50:1. I ran that this weekend but I wonder if that's ok? I used Amsoil Synthetic, it can be run as injector oil or as premix. As a matter of fact, the bottle says to run it at 50:1 as a pre mix. Any ideas or comments?
Daryl
1970TNT
50:1 MIX WAS USED FROM 1974 TO 19?? SO YOU ARE OK. 40:1 IN 1973 AND 20:1 FROM 196? TO 1972. I AM RUNNING 35:1 IN ALL MY PRE 1972 SLEDS.
Bubblenose
20:1 seems ridiculous. Last year I ran 20:1 in all my pre 70's sleds. Tones of blue smoke, and fouled plugs. This year i am running a great oil, and 32:1 ratio. What a great difference !! certainly on the trails! 29 miles last weekend on a 1968 250 and no plug changes. I took the plug out when I got home and it it a nice dry medium chocolate color
Bones
Howdy. My favourite part of resurrecting a old Doo is rebuilding the engine
I am not a racer, just a trail rider but doo know how to pin the joy flipper in the fluff
I would not think of running my old Doo at anything but 50:1 with modern oils but I just have NO LUCK at that mix, just can`t seem to burn down a engine so I can re-Doo it
Also, dang I save a few bucks on oil & I don`t need to have a sleigh full of spark plugs in tow.
A few years ago I rebuilt a `74 - 440 FC T`nT, converted it to a Mikuni carb, always run it at 50:1. Never changed a spark plug for over 2,000 miles , but the plugs aren`t NGK either
It still runs just fine.
Bones
snow4me1
What octane fuel should be used, 87,89,91,93 or even 94? Stock 79 250
Thanks, Daryl
pmhvps
Talking to an old mechanic over the holidays and the subject of old engines, old bikes and old snow machines came up.(ya, talking about everything) He, basically said, the older (50's, 60's and 70's) engines were not designed to run on synthetic oil and will shorten the life.
Mike.
snodrifter
I think that the "OLD" mechanic needs some updating. Damn this new-fangled tech.
73ss_elanman
I'm with bones. The only times i've had to change a plug were when I replace them at the start of the season. I buy a new plug for every cylinder every year, and just replace it each fall as a reliability factor. No problems as of yet,
running at 50:1 with 2 stroke oil, sometimes it is expensive snowmobile oil, sometimes it is 2 stroke weed eater oil, some times it is mercury outboard oil.
most of the time it is the cheap canadian tire moto-master brand snowmobile oil or castrol super.
mixed with regular gas.
320Racing
We race a 292, 320 and 335 and mostly run them at 32:1-40:1 Polaris Blue oil. Personal opinion, we also put in Lead Additives since the fuel now-a-days is unleaded.
Built to run on lead, keep em runnin on lead. Runs cooler and more lube. Thats what we do and dont have as many breakdowns. Happy riding!
Pa Poidy
Hi 320
I agree, we should be looking at the non lead, lead more than mix ratio [n older sleds, I am not in favor of synthetics, they seem not to use them until after break in period
cdem72
I squeaked my elan blizzard motor using 30:1, 91 octane premium on a -7 C day with the hi speed set a snib too lean! My motor guy had a look and said damage is minimal but the cylinder/piston looked like they got a little too hot and maybe was lacking oil. A slight hone, clean up the piston and grooves and dress the rings and it will be back in shape. I think I'll be running 20:1 with premium and a richer hi speed for sure! But that 246 bored to a 292 ate my 440 T'NT for lunch; I just want it to survive!
Bubblenose
Wow...and it was that cold??
nasty2fifties
cdem - I've had 71's, 72's, and 73's. Now I have a73 250T and three 73 SS's. I had never even heard of an elan blizzard until I saw yours. Last weekend I was buying some elan parts from a guy and he had one, so I got to see it in the flesh. Not much room for your feet with that big pipe! What is the HP on that big 292?
cdem72
Nasty2fifties: The stock 246 is supposed to be 29 hp and the 291 is supposed to be 31 hp. I had it dyno'd and it tested 29 hp, and should have quit while I was ahead! LOL! But I fiddled with it a bit after I got the motor back and I'm sure it was pulling harder but it was a little too lean. I have been advised to keep it as rich as possible, at the point where it just starts to pull hard, even if there seems to be a bit more to go on the hi speed adjustment. Check out my web page, "Colin's Vintage Ski-doo's" at Imagestation.com as I have some more pics of the elan blizzard under construction and some video. PS, it was running OK last year but would drop revs under full throttle. But once I installed the original blizzard clutch it was a totally different sled, high rpm engage and peak revs equals a little screamer that ate my '71 440 T'NT for breakfast. PS, that tuned pipe was not gentle to the top of my boot and bottom of my pant leg!
DooNoob
every sled i've ridden i have used 50:1 in it and have not had any issue whatsoever other than possibly the lines aging just slightly quicker than the people i know who run 30:1 but they also seem to have plug fouling problems. i swear by 50:1
