Mikuni RS38 Carb Kit- Honda Four DOHC CB 1100, CB900, CB750 Engines

$1,620.00 AUD$1,720.00 AUD

Positively identify you carb bank dimensions from the product description and select accordingly.


This Mikuni RS38 carburetor Kit is for the Honda DOHC CB1100, 750’s and 900’s with race worked engines. They will breathe a whole new lease of life into your machine with an up to 25% increase in power, whilst making it perform and operate as it should with no hesitations or flat spots.

You will very quickly realize that the expense of a rebuild of your old worn OEM carbs can far exceed the cost of these new units and unfortunately as with many rebuilds now days you only have the option in many cases of gambling with very poor quality aftermarket parts. Considering this and if intending to ride and enjoy your motorcycle it makes good sense to retire your OEM carbs into the cupboard and step up to a set of RS’s.

Before rushing in and ordering please firstly check your carb spacing and carbie sizes for compatibility. These are not suited for downdraft engines.

This Mikuni kit comes in two fitment options with the following carb centre to centre spacing’s for direct fitment to Honda CB750. CB900 and CB1100 and will adapt to the stock air-box (55mm dia.) and engine inlet rubbers.

Option 1- Suits 1979 thru 1983 models. Outlet Diameter at the engine side is 44mm

A= 80mm (spacing centre to centre between carb 1 & 2)
B= 100mm (carb 2 & 3)
C= 80mm (carb 3 & 4)

Option 2- Suits 1984 and later models. Outlet Diameter at the engine side is 42mm. If using the OEM air-box note that these carbs are 4mm shorter front to back than the OEM units. There is an oil line mod required for carb bowl clearance on some models shown in the picture gallery.

A= 72mm (spacing centre to centre between carb 1 & 2)
B= 88mm (carb 2 & 3)
C= 72mm (carb 3 & 4)

Pilot Jet: VM28/486-17.5, Needle: 9DZH1, Needle Jet: P-4 (568 Series), Main Jet: N100.604-120/130

Your stock throttle cables will not match to these carbs, where we have available in the RS accessories page either our road bike throttle and cable assembly (KRS-001) or a Quick action 1/4 turn throttle and cable kit (PPQA40K)
You can also buy separately either POD filters or Velocity stacks which have no form of filter in them (15, 30,50 and 75mm long) for racing.

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 RS Kit

CB Models 79-83, CB Models 84up


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