Mikuni VM Round Slide Carb Kits- 4-Stroke “READ DISC. TO SELECT”

(2 customer reviews)

$143.00 AUD$277.20 AUD



To best select a replacement Mikuni Carburetor for your motorcycle please follow the steps listed out below. Due to the requirement of virtually every model bike requiring a unique set of jets, our process below will allow you to correctly select a jet kit and other associated components to your personal requirement. 

On the main menu to the left of the page, hover over the carb listing for VM roundslide, maybe also look at TM Flatslide non-pump and TM Flatslide with accelerator pump and then select from the drop down list the desired Mikuni carburetor size option for that particular carb type.

Click on each carb size and type you believe may suit your engine and remember don’t just look at similar size carbs as to that fitted on your bike as often some bikes that may have come standard with say a 32mm Amal carb may well run with VM carbs as big as 36mm.
Better venturi design and to a point a larger bore size equates to performance improvement where with Mikuni the progression ranges from the VM then TM and topped off with the TM pumper carbs on 4-stroke engines.
Do be careful if we don’t have an exact Mikuni carburtor suggestion for you bike, not to up size too much as eventually this will cost you mid-range performance.
When clicking on any individual size Mikuni carb from the drop down list it will put you into a page showing not only the carb itself but also any item relevant to that carb, being jets, flanges, tuner kits, cables , throttles, air-cleaners and a range of carb to OEM air box adaptors to also suit. This also makes alternate jet selection easy for you if you have your own spec as only the type jets for that particular carb are shown.
When clicking on the carb itself, thoroughly read the carb description and check for size suitability. Then back arrow back in the carbs main page and go into the tuner kits, which show in the sales drop down list the jetting kits we have for confirmed suitable engines for that particular carb. Again thoroughly read the tuner kit description.
Basically if your engines not listed choose from the choice of others with a similar per cylinder capacity that you believe to be of comparable performance. This will give you a good jetting start point. Keep in mind a 1000cc twin is much the same as a 500cc single.
If you’re comfortable with the dimensions, suitability and an associated tuner kit for a carb, order it or otherwise please call us to further discuss on 0747712677.

Unlike many motorcycle manufacturers’ purpose modified versions (generally modified to comply with emission laws for worldwide sales), these Mikuni factory VM and TM carburetors are both 2 and 4 stroke compatible and are regarded by the Mikuni factory aftermarket racing division to be the best performing version of these carburetors ever made.

For VMX racers 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 Mikuni VM Series Carburetors include a large selection of bore sizes for increased fuel mixture flow to match engine modifications.  And the Mikuni 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 VM, 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.

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 VM38’s as the 166 series needle jet and others 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.

Additional information

VM Carb Kits

Basic carb only, Carb with full set of jets, Carb w. Jets and Throttle

2 reviews for Mikuni VM Round Slide Carb Kits- 4-Stroke “READ DISC. TO SELECT”

  1. Paul Baltzer

    certainly was an amazing improvement to my custom Triumph bobber. My bike has a very rare single carb head with different stud spacing plus it was an oil-in-frame model. Took a while to go through the issues to work out how to set it up. I had the existing manifold machined by McLaughlin Engineering in Brisbane. The owner and his father have some incredible vehicles and bikes and understand the issues. They do specialized work on my custom Harleys. I did not want to use a 45 degree manifold so it took extra time and expertise to mount it. The bike has just won top bobber at the 2017 Gold Coast Car and bike Show. I appreciate Tom’s advice and am happy for him to use the photos I supplied.

  2. Jmessana

    I have a 1982 Honda XR 500RC (with a standard tired motor) that I ride in VMX. Tom advised a Mikuni VM 38mm round slide would be a good upgrade from the standard 34mm carb. There is a small amount of fettling needed to install the carb and workout pluming to the airbox but not beyond a novice (me) Tom suggested a jetting starting point of Pilot 30, needle jet 166-Q2, needle position 3, main jet 220. This seems to be ok in my circumstances (but I will continue to test different options to make sure I get the best out of the jetting,
    additional jets available from Tom) I was amazed at how easy my bike started up after installing the carb, the bike hadn’t been running for 3 months and started on the second kick and idled straight away. The new carb has changed the performance of the motor dramatically, it idles better, is more responsive across the power range, delivers a bit more power, starts easier hot or cold and it has changed the exhaust note (sharper) I also noted that you have to be a little more detailed when using/modulating the throttle.
    This has turned out to be a great upgrade for my bike and Tom gave some great advice to get started.
    I absolutely recommend this carb for this model bike and appreciate receiving great advice from Tom at Mikuni Oz.

    If you want a break down of install go to Honda XR 500 google community.

Add a review

Your email address will not be published. Required fields are marked *