BMW R100 Mikuni TM38 carb kit

$865.00 AUD$895.00 AUD

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IMPORTANT NOTICE– For applications where replacing  40mm Bing Carbs which have a 52mm outlet spigot diameter at the motor end, we fit a larger 52mm inlet sleeve & 55mm outlet so as to properly match your OEM rubber boot. With all others do confirm that your carb dimensions match (+ – mm) as per the picture

34 Bing A= 44mm  B= 110mm D= 50mm

40 Bing A= 52mm B= 110mm D= 55mm (some early ones differ at 50mm where please contact us if yours is 50).

Going  even faster has never been so easy when upgrading to a Mikuni TM Flatslide, say goodbye to worn old flooding stock carbs, hard starting, irregular idle, hesitations, and flatspots.  The Dual Mikuni TM38 carburetor kit is easily fitted to your BMW  R100 and the improvement is instant. The TM’s will deliver a more crisper and quicker acceleration through the mid-range than the VM round slides which themselves are also great improvement over stock. This kit includes two silver anodized sleeves fitted to the inlet end of the Mikuni TM38 to match the original Bing carburetor 50mm dimensions. On the R100’s that came fitted with the 40 Bings we also fit sleeves to the carb outlets (43mm as they are) for size matching. There is also a pair of inner throttle cable wires provided to replace the existing inner cable where you are required to solder the provided nipples to the base of the new wire.

With this size carbs do be mindful that the earlier OEM Round type air filter in the stock air box often will not keep up with the air flow requirement and increased power these carbs generate where if at all concerned do request that we supply the inlet sleeves loose so you can do some air box pipe on and off test runs, where you may have to consider using PODs if unable to get a sufficient air supply. Also do check that your throttle mechanism is able to activate full wide open throttle on this carb set. Synchronizing the carbs to match each other at the point where the slides exit the carb throat will confirm this but do remember they do need to lift that bit more again for the back of the slide to also clear the port.

The most commonly suited jets for Australian fuel and conditions have been fitted as well as spares for fine tuning the top end at WOT. 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. Please do contact us if you believe further fine tuning is required and we can guide you through the process. Once tuned a VM Mikuni will not go out of tune for many years.

At Mikunioz, for the last 30 plus 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 carbs or done here before shipping.

You will instantly experience better throttle response, improved acceleration, increased horsepower and torque.


If wishing to a different air filter rather than have the sleeve fitted 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 Mikuni VM Carburetors and then select TM38 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 tuning kits, Mikuni cables , Mikuni throttles, Mikuni air-cleaners and a range of Mikuni carb to OEM air box adapters etc to also suit. This also makes alternate jet selection easy for you if you have your own spec or wish to purchase extra jets as only the type of  jets that fit 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 BMW

R100 with 44mm Spigot, R100 with 52mm Spigot, R100 1070 Kit 44 Spigot, R100 1070 Kit 52 Spigot


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