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fuel to to oil mix

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fuel to to oil mix

Postby sno*jetfreak1 » December 16th, 2003, 3:38 pm

what do u guys recomend for a 1973 snojet, modle: star jet, its got a 340 yamaha engine, and it is fin cooled, single tilloston carb, i have been running it about 30:1 but after every ride, the next time you go to fire it up one plug is dead, i have rebuilt the carb several times and tried hotter plugs, currently i am using NGK B8HS plugs, what are recomended by the manufacture, 40:1 would probably be ok when its real cold but i'm worried when it warms up, any input is greatly appreciated!
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[blue]1973 star jet 433, 1975 sst 340 f/a mod[/blue],[red]1969 olympic, and 1970 olympic 12/3 300cc rotax[/red][purple],1995 Kodiak 400 4x4[/purple][red],1989 Yamaha DT200[/red]
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fuel to to oil mix

Postby sno*jetfreak2 » December 17th, 2003, 9:08 am

my sled manual from 74 states 25:1 for the 340's in it. So i am sure 30:1 will do it unless your running it in summer.
"I find that your American beer is a lot like making love in a canoe, it's ****ing close to water."
Montey Python
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fuel to to oil mix

Postby Ocean State Sled Head » December 17th, 2003, 8:20 pm

I would run it 40:1 with some really good oil, like Yamalube.
The manual recomends 20:1, but this is too rich. This is why your plugs get fouled.
When the books says 20:1, thats when there was leaded gas.
The new oils are better, and today's gas has no lead.

Your factory plugs should be BR9EV with a (.020 -.024 inch) or
0.5 - 0.6mm electrode gap.

Go to your local sled dealer, and buy a book called Snowmobile Service Manual 11th Edition by Intertec Publishing. This book covers all sleds up to 1986.
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fuel to to oil mix

Postby sno*jetfreak2 » December 18th, 2003, 9:02 am

Actually the manuals specifically stated to use premium gas which was unleaded in the mix. So don't screw with the mix ratio too much.
"I find that your American beer is a lot like making love in a canoe, it's ****ing close to water."
Montey Python
sno*jetfreak2
Member
 
Posts: 155
Joined: December 11th, 2003, 8:21 am
Location: Sask Can Eh?

fuel to to oil mix

Postby sno*jetfreak1 » December 18th, 2003, 9:22 am

is yamahalube synthetic oil? and is it a good idea to use synthetic oil in an older machine
___________________________________________________________________________
[blue]1973 star jet 433, 1975 sst 340 f/a mod[/blue],[red]1969 olympic, and 1970 olympic 12/3 300cc rotax[/red][purple],1995 Kodiak 400 4x4[/purple][red],1989 Yamaha DT200[/red]
sno*jetfreak1
Member
 
Posts: 42
Joined: December 11th, 2003, 8:15 am
Location: Snow is good...BUT DIRT RULES!!!

fuel to to oil mix

Postby Ocean State Sled Head » December 18th, 2003, 8:28 pm

It's not recommended to use synthetic oil in old sleds. Stay with the real oil. I still say run it 40:1 for best fuel consumption and performance.
Ocean State Sled Head
 
Posts: 3
Joined: December 10th, 2003, 3:38 pm
Location: North Smithfield, RI


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