1. VM16-519 16mm Mikuni VM Carburetor

Description

Sorry this carburetor is no longer produced by Mikuni.

The Mikuni VM16-519 is supplied with the following factory jetting installed:

Pilot jet 25 (VM22/210),  Needle 3DJ3,  Needle Jet D-8 (16/67 Series),  Main Jet 70 (4/042),  Air Jet 0.5,  Slide Cutaway 2.5 (VM16/137),  Needle valve 3.3

Mikuni VM16-519 Dimension A= 21mm Bore size, B= 67mm, C= 108mm, D= 31mm, Total Width= 69mm

This 16mm Mikuni VM carb has a built in clamp and seal for mounting over a 21mm diameter pipe coming out from your engine. If retro fitting in place of a spigot type carb you will need to have a pipe made with a 21mm OD and at least 15mm in length for mounting this carb with the other end matching the diameter and length of the OEM carb spigot you’re replacing.

Unlike many motorcycle manufacturers’ purpose modified versions, these factory VM Round Slides are both 2 and 4 stroke compatible and are regarded by the factory to be the best performing version of this carburetor ever made.

These are the most popular high performance singles carburetors in the sport of motorcycling. Mikuni’s VM Series round slide single carburetors have proven themselves as the performance standard for use in any single cylinder motorcycle and ATV applications for motocross, enduro and trail riding, to flat track racing and road racing on both 2-stroke and 4-stroke engines.

Performance features for the VM Series Carburetors include a large selection of bore sizes for increased fuel mixture flow to match engine modifications.  And the VM Series offers a wide range of tuning components to allow precise fuel mixture metering in any application, at any throttle setting, under any riding conditions.

Tuner jet kits can be purchased separately for many different motorcycles as per the corresponding  options. These kits consist of the suggested jets for changing that are not matching those factory fitted in the Mikuni VM16-519, they include an extra one size up and one size down main jet for tuning the main circuit due to fuel quality variations, altitude and climate. Testing and conformation of correct main circuit jetting can only be done by physically changing jets and WOT testing.

Warning: Richer or leaner needle jets (emulsion tubes) are not available for this carb and you need to be aware that when trying to adapt this carb to an unfamiliar engine that it may be untunable if the mid-range jetting needs changing after raising or lowering the needle to its limit  The only option in this situation will be to either linish your needle in the required area if too lean or if rich, research our 4 series needles listing with a view to trying or modifying one. This is a common practice for racers and race tuners but do be aware if not in your field of expertise we do not take returns, so for us it’s better to pre-warn you and not have a complaining customer later rather than to mislead you. Be very careful of sellers telling you otherwise unless you’ve done your home work in regards to this carb being a suitable and tunable upgrade or replacement for your engine.

These tuner jet sets have been determined from thirty years of experience, customer feedback, plus research and development as the Australian Mikuni distributor. From time to time these may not be exactly right for every engine, usually due to changes to porting, compression or numerous other things that contribute to the requirement for additional fine tuning but as a rule our kits are spot on or a very close and useful starting point, but we give no guarantees and sorry do not release kit details or jet size information. If you have your own spec simply purchase the carb and buy any other required jets from the jet pages. This also applies to replacing jets in other Mikuni VM16’s as some items may not match and fit.

Keep in mind that these are suggested specs, and all tuning procedures, as found in our Tuning Tips section must be adhered to for the confirmation of any supplied jet’s compatibility with your engine.