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2008 snopro 600 i wanna jet it for 2250 ft and -20 C.. And im setting timing dial to -3 for reg pump premium... Yes or no
 

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yes on the -3 timing.

I run 480 mains, 40 pilots, updated needle in the middle position, fuel screw 1.5 out, air screw 1 out.

Seems to run good at about 850ft elevation here in mn, that is as 0 deg F.
 

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I don't know how different the 08s are to the 10s but I'm running here in the NWT at 700ft in -30 C the other day with 440mains and even then I thought that was a little fat.
I would run 410s at -20 all day long with -3 timing and XC needles in middle position. I run 470s with my race pipes.
 
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