Mikuni VM series, round slide carburetors
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The Mikuni round slide carburetors used on many snowmachines are rather simple in design, but with parts which can be rather confusing in their terminology. The picture above shows just about any part which is made to be removable and has a name. This picture is not intended to help you in any way other than to identify parts.
To access and maintain any internal parts one must remove the four screws retaining the float bowl on the bottom of the carb. (Here, the sediment trapping tube has been removed revealing the main jet. The main jet can be replaced as necessary without removing the bowl. It does require a special tool.)
Removing the float bowl may require a solid work surface of some sort - even if it is only improvised. Having a properly fitted Phillips screwdriver (#2 tip) and adequate pressure is important to prevent the screw heads from being stripped.