Old Ski-doo Fuel Mixture Ratio. - Snowmobile World : Your #1 Snowmobile Forum

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post #1 of 8 (permalink) Old 09-04-2004, 06:34 AM Thread Starter
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My son is working on an old Ski-Doo that has been setting in a horse barn for at least 20 years. He got it running yesterday,and it sounds good. The machine looks like it is from the mid 70's,and is not oil injected like his newer one. It is air cooled. What would be a good fuel mixture ratio? It will be used in Wyoming at an altitude of 5,000 feet. Thank's for any help...Dan.
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post #2 of 8 (permalink) Old 09-04-2004, 06:57 AM
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alot of people run 50/1 ratio, but ive always found these things to vapor lock a little when they got warm so if you run 40/1 it helps with the cooling effect.

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post #3 of 8 (permalink) Old 09-04-2004, 06:15 PM
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40:1 will work fine, that's what i ran on my 72 polaris

the old guys were telling me 20:1 but it ran like crap
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post #4 of 8 (permalink) Old 09-05-2004, 01:04 AM
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I have been using Amsoil 100:1 premix. This is not just Amsoil injector oil mixed at 100:1 it's a specific oil that can be mixed at 100:1 ratio. I cant say it will work for everything but i use it @ 100:1 in my lawnboy, Mercury 35hp weed trimmer, leaf Blower..Everything i own thats pre-mix. A friend used it in his Mercury XR6 150 HP v-6 that spins at 9,200 RPM's. It does not load up, we have trolled with this motor! To be on the safe side, if you go this route pre-mix @ 60:1 to start with then go from there. Like i said no guarantees but, a lot of people i sell to have had excellent results with this oil.

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post #5 of 8 (permalink) Old 09-05-2004, 08:13 PM
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I had a 1977 Elan with the 250 twin. I ran it with a ratio of 40:1. I believe there was sticker or plate on the engine with some basic engine info on it. Spark Plug type, gap, oil ratio etc. Take a look around, your sled may have this info also. That sled was a fun machine to have, and my brother-in-law still uses it.

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post #6 of 8 (permalink) Old 09-05-2004, 09:03 PM
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40:1 is most common, I think the race sleds go 32:1

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post #7 of 8 (permalink) Old 09-05-2004, 11:14 PM
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im not sure wat i mix it to but it must be 20-30ish:1 i put that in everything if thats too much i mix it to a cretian point where it stil runs good but smokes a bit because of the oil, but hey its cheap insurance!

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post #8 of 8 (permalink) Old 09-06-2004, 09:05 AM
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I mixed my Citation 50-1 and she never ever burped...Ran like a top and still does 3 primes 1 pull anyday
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