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Details
Pre-Jetted carburetors only. If you are in need of a full kit, please contact us or check the carburetor kits portion of the site.
Jetting Specifications Carburetor # Venturi Size Main jet (VM4/042) Pilot Jet (VM22/210) Needle Jet Jet Needle Throttle Valve Air Jet Needle Valve VM34-275 34 230 40 P-2 6DH3 2.0 2.0 3.3 Pre-jettted carburetors for the BMW R100. Intended for stock, or mildly modified engines. Includes left and right carbs.
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-R90 Brand Genuine Mikuni Country of Manufacture Japan Carburetor Application Model Specific Carburetor Size 34mm Carburetor Type Round Slide Carburetor Mount Spigot Carburetor Intake Bell Diameter 58mm Engine Side Sizing 40mm Accelerator Pump No Carburetor Depth 93mm Carburetor Height 137mm Carburetor Width 83mm Fuel Inlet Size 5/16" 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 Fitment Information
BMW Models
- BMW R90 6 1973 - 1976
- BMW R90 6 898 1973 - 1976
- BMW R90S 1973 - 1976
- BMW R90S 898 1973 - 1976
Questions & Answers
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Hello, the jetting states it's for r100 r90 the main seems kinda lean. Do you sell throttle cable for this setup?
We have received very good feedback on the jetting specs of these carbs for both the R90 and the R100. Every bike, and riding situation is different, but we are pretty confident that these settings are very close for most stock, or close to stock bikes, with a close to sea level riding zone.
Answer by: Web Support (Admin) on Jan 30, 2017 12:41:00 PM -
Do these come as kits with the necessary rubber boots to fit them to my R90/6?
This item is for the pre-jetted carburetors only. We do have the components for a full kit, and are working to release it soon.
Answer by: Web Support (Admin) on Aug 14, 2018 10:31:00 AM -
I purchased two VM 34 R90 carbs. They don't supply enough fuel to the cylinders. Can they be re-jetted to a larger size?
At what throttle position(s) are you experiencing a lean condition? Idle and just off idle with be the pilot jet, and air mixture screw position. 3/4 to wide open throttle is the main jet. Needle, needle jet, and slide mostly take care of in between.
What type of exhaust setup are you running? What altitude do you ride at? Are you sure there are no air leaks between the carbs and the engine?Answer by: Web Support (Admin) on May 27, 2022 2:16:00 PM
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- Fitment Information
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Fitment Information
BMW Models
- BMW R90 6 1973 - 1976
- BMW R90 6 898 1973 - 1976
- BMW R90S 1973 - 1976
- BMW R90S 898 1973 - 1976
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