Mikuni VM38 Kit Yamaha SR, TT, XT 500cc

$370.00 AUD$395.00 AUD

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Going fast has never been so easy, say goodbye to hard starting, hesitations and flatspots.  This Mikuni VM38 has for years been the popular performance upgrade for VMX racing and is easily fitted to your Yamaha 500cc SR, TT or XT. The fitment of the provided outlet mounting flange moves the carb slightly forward enabling it to better clear the frame and accommodate the VM38’s 43mm spigot. This carb will not fit the standard air-box requiring the separate purchase of your preferred air-filter type. The Yamaha OEM Push/Pull throttle cables will not fit this carb so included in the kit is a new throttle cable and a 1/4 turn quick action throttle. On models with vacuum operated fuel taps there is no allowance for your hose connection on the mounting flange or carb. Most people will change out the tap for a non vacuum type. There are jets provided that must be changed as well as spares for fine tuning the main jet circuit doing WOT tests. Climate, altitude and fuel density from different octane fuels all have varying effects on final fine tuning as does cam, exhaust and cylinder head porting etc. For this reason we have included what we have found to be a range of jets to allow you to tune to most variables using Australian fuels.

At Mikunioz, for the last 30 years, we have been constantly checking and where necessary upgrading our jetting specs as fuel quality changes. Regular fuel in the USA is 85 octane or 91 in their premium brands which have numerous additives and blends added (basically smells and drys like wood varnish) which results in a totally different jetting spec and product performance. This carb as supplied from the factory will never work on this bike and requires a total re-jet as supplied loose with your carb.

All throttle cables must be lubricated during installation with cable lube or a very light oil such as 3 in 1 to avoid clogging. Besides the need to lubricate the inner wire in the housing, the cable end barrels at their pivot points should be lubricated with water proof grease.
If you need to clean your cable which is particularly relevant for dirt bikes. We recommend using WD40 or a very light oil such as 3 in 1. This effectively washes away dirt from the cable, without clogging it.

Our 7/8″ (22mm) MX Quick Action Competition Throttle assembly is designed with the ideal ratio for use on our 30 thru 38mm non-pump type Mikuni TM and VM carburetors. It has a black epoxy finished die-cast aluminum housing, nylon throttle sleeve and fits our single or one into two pull cables for twin carburetor applications plus those made for early disc brake Honda singles.

This manufacturer has been making aftermarket throttles, cables and other products of quality for Mikunioz since the mid-1980’s. The MX Quick Action Comp Throttle is a sleek looking classic design which will clear the brake master cylinder on the handlebar.

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.


If wishing to modify or use your existing Yamaha cables to suit the mikuni TM36-68 you can purchase the carburetor, tuner jet kit and or what ever other components you want individually by following the directions below.

On the main menu to the left of the page, hover over the carb listing for TM Carbs with Accel Pump and then select TM36-68 from the drop down list. When clicking on any individual size Mikuni carb from the drop down list it will put you into a page showing not only the Mikuni carb itself but also any items relevant to that carb, being Mikuni jets, Mikuni flanges, Mikuni carb tuner kits, Mikuni cables , Mikuni throttles, Mikuni air-cleaners and a range of Mikuni carb to OEM air box adaptors etc 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.
Click on the carb itself if wanting to view the full details and or to make your purchase. 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.
If you’re comfortable with making a purchase of the carb, tuner kit any or other associated components, order it on line or otherwise please call us to further discuss your needs on 0747712677.

All international buyers are responsible for the payment of their domestic customs duties and taxes charged on imported goods. The duty free threshold and duty/taxes payable rates differ from one country to another and we strongly advise you check your liability before ordering if unsure. Please check your tracking on all international shipments within 7 days to follow their progress and determine if it is being held by your local customs dept. or on their behalf by the Postal Service, who you will need to make contact with using the provided tracking number.

Please Note: Other than exact replacement OEM carburetors, all Mikuni Aftermarket Carburetors and Tuning Components are sold “As Is” for Off Road / Racing Use Only and are not intended or approved for use on vehicles operated on Public Roads or in locations where applicable engine tampering and anti-pollution laws apply.

Additional information

Select your Engine

SR 500, XT or TT 500


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