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Old 02-27-2006, 11:33 PM   #1
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Just picked up a couple of cats , Spirit 440cc, late '70s What is the oil fuel mix ratio???? Please help so I don't blow these babys
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Old 02-28-2006, 08:41 PM   #2
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Sled: 1977 pantera, 1975 cheetah
ATV: 04 polaris trailboss
2007 Mileage: alot
Well both the pantera and cheetah say 20:1 on them. With the better oil of today though you could probably get away with a little less oil.
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Old 03-01-2006, 12:15 AM   #3
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Sled: 1977 cheetah 81 trailcat 94 jag 96 puma
07-08 Mileage: 700
ATV: lt250sk lt125
I have 3 old cats using amsoil 50:1. 2 years now no problems and better fuel mileage
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Old 03-01-2006, 07:57 AM   #4
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Originally posted by steve01@Mar 1 2006, 12:15 AM
I have 3 old cats using amsoil 50:1. 2 years now no problems and better fuel mileage
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Agree w/steve01....been using amzoil premix in my '75 Z440 for years now...up to 100:1 ratio.....no oil related problems ever and much less smoke!

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Old 03-04-2006, 08:26 AM   #5
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Thanks guys, from my old days I thought it would be 20:1 but with new oils and most small motors runing at 35:1 to 50:1 ithink I will try less oil. Not sure if I want to attempt 100:1

Thanks again
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Old 03-30-2006, 11:10 PM   #6
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Sled: 1972 303 Panther
ATV: Pontiac VAN
2007 Mileage: 20,000
I ran a 1978 Jag 2000 on Klotz synthetic for years @ 50-1 and premium fuel. No oil related problems.
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Old 04-01-2006, 08:54 PM   #7
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Sled: 1997 zrt 600,1995 zr 580
ATV: yamaha timberwolf
2007 Mileage: ????
If you spring for good oil like amsoil 50:1 is no problem. I run alot of my old sleds on 40:1 even with cheap oil alot depends on how and how much you will ride them.
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Old 04-14-2006, 08:08 PM   #8
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Sled: 1993 Thundercat
Keep in mind the old sleds with rich oil mixtures like 16:1 and 20:1 used jetting specs that reflect this. Oil doesn't burn much so your 20:1 mixture say, might be perfect with stock jetting will run pretty rich at 50:1.

I had a 75 250 Z that was soggy rich with a 50:1 ratio but at 16:1 the plugs colored up beautiful.
I also have a 76 Merc Snowtwister 250 ST that the manual recommends AVGas
and a 16:1 ratio. We ran 100LL and Quicksilver oil at 16 or 20:1. Won many races.
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