VM38 Single Mikuni Conversion Kit Yamaha XV Virago 750up, Pancake

Description

Getting that older 70’s custom look whilst going even faster has never been so easy, say goodbye to hard starting, hesitations and flatspots.  This VM38 Mikuni roundslide carb, will fix all your old stock carb issues and look great. Even bigger performance improvements can be gained using our TM40 or TM42 Pumper kits.

The kit includes:

A pre-jetted VM38 Mikuni Carburetor. A Mikunioz designed cast two into one manifold with an enlarged mid manifold plenum area to better facilitate the fuel mixture between the cylinders. To allow for a wider manifold with better holding grip whilst still isolating the heat from the fuel delivery system, the OEM carb rubber mounting flanges are replaced with 2x shorter  Mikuni heavy duty flanges designed and made for the Harley market. A 3rd heavy duty rubber flange is supplied for the manifold to Carb connection. A USA made Pancake air-cleaner, 2″ wide and 5″ diameter with an off set flange the filter can be changed to the pictured one with chrome cover by putting a note in the cart message box. The filter media can be washed and re-oiled. This light weight filter is great for unsupported applications. This filter has been specially designed and made for Mikunioz by S&B filters in the USA and has a Moz embossed rubber cover. Select when purchasing either a nylon lined throttle cable to connect to your stock throttle. This cable measures 950mm long with a low profile 90 degree carb top fitting. As many of these bikes are now custom modified,  if you do advise at the time of ordering that you require a different end fitting to suit another throttle type or length (1050mm max reducing to any shorter length requested) we can in most cases do the changes at no cost. This only applies to a request at the time of purchase and also do be aware that some aftermarket throttles may not manage to fully open the slides on these carbs where generally some throttle tube modification will remedy this. The other option is for customers using 1″ bars, were you can select the kit with a throttle and either 30″ (760mm) or 36″ (915mm) cable. Hardware includes all bolts, washers and 1x 4mm Vacuum hose tail requiring a 5/32″ hole drilled to locate in a location of your choosing if required. No fuel or vacuum lines are provided.

The choke is usually never needed in most climates. Normally just start, feather the throttle for 15 seconds or so and you’re right to go.

The jets to make this carb operate on Yamaha XV models have been fitted and there are 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 fuels.

FUEL PUMP MODELS: With an 1100 or others if you still use the fuel pump , sometimes you may encounter leaking out the overflow at idle.The float height is factory set and will be correct. This is caused by the pressure from your pump which is popping off the needle and seat. Adjusting float height 2mm may work but usually not. Otherwise there are two options:

1) install an extra “T” on the carb supply line so as to then run a return line to the tank. This line needs to be plugged with a restrictor so as to work as a pressure relief whilst to not take flow preference away from the carbs. Usually a 1mm hole in a restriction plug fitted inside the new line is good.

2) replace the 3.3 needle and seats with the 2.0mm option from the VM28/511 option drop list found in the main menu needle & Seats page. There is a video in our “How to Videos” main menu option “leaking needle and seat causes and removal”, watch the removal process for your carb type if changing seats.

In “How to videos” page the VM carb tune check also relates to the TM carbs and we do recommend you also watch the cable attachment and carb sync video

Our technicians can guide you through any after sales carb related inquiry.

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 which is done in house at Mikunioz prior to delivery with jets to suit your location anywhere in the world.

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

IF NOT WANTING TO PURCHASE THE KIT IN ITS ADVERTISED FORM PLEASE FOLLOW THE DIRECTIONS BELOW.

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 VM Roundslide Carbs and then select VM38 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.