Re: Way OT- Snowmobile

Posted by davpal on February 19, 2007 at 23:12:35 from (216.93.88.150):

In Reply to: Way OT- Snowmobile posted by Bret4207 on February 19, 2007 at 15:52:54:

The sled should have a set of 40 mm mikuni's on it. They are fairly easy to lean out if you want to. You can probably get away with just dropping the main jet down a few sizes. Remove the airbox and now loosen the carbs from the rubber flanges on the motor. They are held by a metal band that has a screw tightening it to the rubber boot. Now you can usually pull the carb right off the motor and you will be able to see the float bowl. You don't have to even unhook the throttle cables. Just take off the bottom plug in the bottom of the carb bowl. It is probably 17 mm wrench to take it off. Now look in the bowl and you should see a jet in there. Take it out with a 1/4 inch socket or nut driver. You should be able to see a number stamped into it. If it is like a 370 you may want to drop down to a 340 to start with to lean it out. Don't go too far because if it gets really cold you could lean it out and blow it up. You want to check the plugs after doing a 100 yard full throttle run. If they are very black and wet you are too rich. If they are whitish to a light gray you are too lean. You want the plugs to be a nice buckskin tan color when the mixture is correct. Replace the bigger jet with the smaller until you get this tan color. You can get jets from dennis kirk on the web or any dealer has them for a few bucks apiece. That should get you started. I have done lots of snowmobile fixing and racing over the years. I changed some jets tonight. Good luck.

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