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Old 12-11-2009, 04:02 PM   #1 (permalink)
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1971 Scorpion Stinger Mark III

I bought this sled yesterday and its in good running condition. They previous owner said it was to run 50:1 mixture, but he ran 40:1, any ideas on the real mixture?
Its the 400cc fan cooled
Thanks.
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Old 12-11-2009, 04:38 PM   #2 (permalink)
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50:1 seems rich to me, 40 should be fine.
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Old 12-11-2009, 04:42 PM   #3 (permalink)
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my friend who has a stinger II runs between 35:1 and 40:1, but then again he isnt real peticular with his sleds... wouldnt 50:1 be lean?
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Old 12-11-2009, 06:31 PM   #4 (permalink)
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yes, 50:1 would be lean, you are correct. So 40:1 seems like the going mixture?
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Old 12-11-2009, 09:02 PM   #5 (permalink)
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sounds like that would be a great idea. just keep an eye on the plugs incase its alittle too rich
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RIP 91 Polaris Indy Trail,
85 Polaris Indy Trail... 488 motor from ^
74 Polaris Colt... custom 440 motor from ^
89 Ski-doo Formula Plus (521)
92 Ski-doo Safari L (377)... still in diagnostics phase

praying for snow and for the packers
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Old 12-12-2009, 09:33 AM   #6 (permalink)
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Sorry, meant lean not rich.
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1996 Arctic cat ZR 580- 6 inch risers, C+A powder skis, 99 ZR's front suspension, freshly rebuilt engine

1992 Ski doo mach 1 617cc (the beast)

Die hard polaris anti-fanatic!

Do the snow dance with me!!! We don't get enough in Vermont!

And God said: "Let there be snow."

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Old 12-12-2009, 10:16 AM   #7 (permalink)
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that's a nice ride fella
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