Mercury Snowmobiles Discussion Board

Also, good luck finding one that works. Not sure what it is but I haven't found a Sno-Twister tach that works.

Number I have is D-754-4620A2. Good luck.

I have heard of converting to a Yamaha ET250/300 or Inviter track as they are 102" with the same 3.29" pitch as the Merc.

If you go to this website they have all the Merc wiring diagrams and other Merc info plus many other brands. Click on Merc, then wiring diagrams.

I have not had my motors apart to compare them but they are different part numbers for the 250 as opposed to the 340/440 cranks.

Both serial numbers are for 1975 340 S/T models. 1975 sleds would have build-dates of 1974.

Let me be the first to ask; Where are you located??

Due to the fact that the 1974 Kohler 400 was prone to grenading, Mercury had an exchange program for 1975 where you could trade your 74 400 motor for a 75 340 motor. You used the 400 carbs and pipes and away you went.

They run 36-41 carbs with a 340 main and a 35 pilot but I would have to take one apart to get needle and needle-jet numbers. The parts book only gives part-numbers, not sizes.

The M340RLC is the correct motor for the Merc. The M designates that it was built and ported to Merc specs.

Don't hold your breath waiting for pics as it's been over a week since I contacted him.

I'm sure this question has been asked before but I don't recall seeing a definite number. How many 1976 Sno-Twisters where built? I recall someone posting that 500 of each size was built but I think there must have been more than that when you consider how many must have gotten wrecked and how many ...

Looking for a set of rings for a K400-2rs motor out of a 74 S/T. Thanks.

John

Are they a plastic snap or metal? Any chance someone could send me a pic of one. Thanks for the info.

I thought the 71 was black and they went to red for 72. My 72 has the red seat.