1975 sno twister / 1976 sno twister ????

tempusfugitive · Post by **tempusfugitive** » Wed Feb 09, 2005 2:19 pm

hey all
i'm looking into an old merc sled for a friend of mine, it was identified as a 1976 sno twister 440, but its a free air, it has the exposed cylinder heads,and the offset headlight, from what i've read that would mean it is a 1975??, i don't have the s# available at the moment.

also what are the basic specs for the machine, ie oil ratio, idle mix settings, track tension, correct sparkplugs, ect.

thank alot for the help
its much appreciated
steve
btw, feel free to email me

Post by **Mercury** » Wed Feb 09, 2005 6:34 pm

Pictures of most of the sleds can be found here.

http://www.mercurysnowmobiles.com/model_id.htm

Just click the link and match them up.

Bill

tempusfugitive · Post by **tempusfugitive** » Wed Feb 09, 2005 8:19 pm

sweet, so it is a 75 then. any ideas where i could find the oter info?

Post by **Mercury** » Wed Feb 09, 2005 8:53 pm

Spark plugs Champ N19V

Oil 25-1 first tank of the year then 40-1. Use a good grade snowmobile oil...not synthetic.

Track tension hanging 1" in the center.

436cc, Merc did not rate horsepower....estimated at between 60 & 80

Bill

tempusfugitive · Post by **tempusfugitive** » Thu Feb 10, 2005 8:39 am

thanks

jwaz · Post by **jwaz** » Fri Mar 18, 2005 9:54 pm

Isn't the fuel mixture 20:1 on Sno Twisters & 40:1 on Trail Twisters?

Post by **Mercury** » Sat Mar 19, 2005 3:15 pm

The original specs for oil were as follows for the Twister models (other Merc models may vary.....

16:1 Liquid cooled sleds

25:1 Free Air Sleds

40:1 Fan Cooled Sleds

This was with 1975-76 oil blends. Things have changed alot since then and I read somewhere where they felt that with the newer blends a 40:1 mix was satisfactory.

The decision was yours but I still go by the original recommendations.

Bill