For the Yamaha XS400 we recommend the VM32 carbs for better torque and performance, even though the stock CV carbs are a 34mm you must allow for the area taken by the shaft and butterfly in the throat which consequently makes for a much smaller venturi than 34mm, which also has an air flow interruption factor. Going faster has never been so easy, say goodbye to hard starting, irregular idle, hesitations, and flatspots.
The VM32 Carb Measures 58mm diameter at the air-filter inlet end, 102mm front to back and 40mm diameter at the outlet end.
The Dual Mikuni VM32 carburetor kit is easily fitted to your Yamaha XS400 and the improvement is instant. This kit includes our shorter 70mm long POD filters, optional CNC machined silver anodized manifolds with heavy duty rubber boots and a nylon lined premium quality throttle cable with 70 degree lower and chrome plated top fitting to suit your OEM throttle housing. 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 over 30 years, we have been constantly checking and where necessary upgrading our jetting specs as fuel quality changes. Regular fuel in the USA is 85-87 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, which is done here before shipping.
You will instantly experience better throttle response, improved acceleration, increased horsepower and torque.
Our premium grade cables use a Nylon lined outer housing. The Nylon liner inside the outer cable housing conduit is for reduced friction and heat resistance. They are supplied with shortened 70 degree lower cable end fittings for better petcock clearance, an inline adjuster on the top cable and a chrome OEM type top fitting for attachment to the stock Yamaha XS throttle housing.
IF NOT WANTING TO PURCHASE THE KIT IN ITS ADVERTISED FORM PLEASE FOLLOW THE DIRECTIONS BELOW.
If wishing to modify your existing Yamaha XS400 cables to suit the Mikuni VM 32, retain your existing mounting flanges or use a different air filter rather than the provided POD Air filter 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 VM32 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.