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Standard Jetting Specifications Carburetor # Venturi Size Main jet (VM4/042) Pilot Jet (VM22/210) Needle Jet Jet Needle Throttle Valve Air Jet Needle Valve VM34-389 34 330 30 Q-0 6DH3 2.5 2.0 1.5 Mikuni VM series snowmobile and cold weather carbs come setup with a cable operated choke, rather than lever. Features special throttle valve and needle valve designs for better suited to colder, more dense air and constant throttle settings.
Mikuni's VM Series, round slide carburetors have proven themselves as the performance standard for use on single and multi-cylinder, motorcycle and ATV vehicles. They're perfect carbs for street riding, motocross, enduro and trail riding, as well as flat track and road racing. These carbs are designed to work on both 2-stroke and 4-stroke engines.
VM series carburetors offer a large selection of bore sizes for optimal fuel mixture and flow to match most engine modifications. A wide range of tuning components are available to allow precise fuel mixture metering in almost any application, at any throttle setting and under any riding condition.
Additional Information
Specification Details SKU VM34-389 Brand Genuine Mikuni Country of Manufacture Japan Carburetor Application Snowmobile Carburetor Size 34mm Carburetor Type Round Slide Carburetor Mount Spigot Carburetor Intake Bell Diameter 58mm Engine Side Sizing 40mm Idle Location Left Accelerator Pump No Carburetor Depth 93mm Carburetor Height 137mm Carburetor Width 83mm Fuel Inlet Size 5/16" Slide Type VM34/110 Main Jet Series VM4/042 Pilot Jet Series VM22/210 Needle Jet Series 159 Needle Series #6 Needle & Seat Type VM34/39 Starter Jet Series VM17/1002 Air Jet Series BS30/97 Float Height 22mm-24mm Questions & Answers
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I have a 1984 Ski-doo SS25 with a water cooled 462 Rotax engine. the original carb is a Mikuni VM34-311 carb.
What is the difference between a VM34-389 and a VM34-311. Do I need to make any changes to the 389 cab to work with my engine?I don't know for sure, but the -311 suffix was likely assigned to the carburetor by Ski-Doo. As far as I can tell, it was not publicly offered. As far as interchangeability, it will likely work fine but you will need to mimic the jetting from your factory carb. Unless you can find somewhere or someone that has a reference to the OEM carb specs, your best bet is to take it apart and record the sizes of each jet.
Answer by: Web Support (Admin) on Feb 4, 2021 9:06:00 AM
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