Fuel and Intake

R&D introduces "Flex-Jet", a simple, effective flexible shaft design. Quick adjustments are now within easy reach. Besides easy access, another benefit is the Flex-Jet's ability to hold its setting. Loose fuel screws are now a thing of the past. Kit includes: Flex-Jet (Remote Fuel Screw), bracket, screw, spring, washer, O-ring and instructions.

Not for the stock DR650 carburetor Fits FCR-MX conversions Only.

Top quality brass screw with molded knob for easy adjustments.

Not for the stock DR650 carburetor Fits FCR-MX conversions Only.

Contains genuine KEIHIN parts to rebuild your FCR41 pumper. Fresh o-rings and float needle insure you don't end up with a crank case full of fuel.

  Not for the stock carburetor. Fits FCR41 conversions only.

Quality rebuild kit by Moose Racing. Comes with everything you need to get your stock carburetor back in shape!

This brass fuel screw offers a longer head to give you a better hold for making adjustments. This is a nice improvement over the standard extended fuel screw. Kit includes one new screw, spring, washer and o-ring.

Direct replacement for the stock spring and exactly like the old Merge Racing spring. Gives a much more consistent accelerator pump squirt. Eliminates the need for the 'O-ring mod', wire or zip-ties on the pump arm. Fits all Keihin FCR-MX carbs except '07-'08 CRF250/450.

Not for the stock DR650 carburetor Fits FCR-MX conversion Only

Repair kit comes with everything you need to get your carb back in shape.

Here is the O-Ring that fits in the carburetor manifold. This is the manifold that holds the carb up to the cylinder head. The O-Ring mounts between this manifold and the cylinder head. When this O-Ring fails it allows air into your cylinder and makes your Air Fuel ratio too lean which causes the engine to run too hot.

This Kit replaces vital components in the BST40 Carburetor including new o-rings, gaskets, jets, needle, mixture screw, float bowl screws, float valve needle and seat (needle jet and other pressed in jets are not included in kit) to return the stock Mikuni BST40 Carburetor to like-new operation. As a bonus we have included Viton o-rings for the float assembly and 4 stainless steel allen screws.

The Remote Fuel Mixture Screw is 5 inches longer than stock. This gives you plenty of length to easily mount in a convenient location. Will work with the stock BST Carburetor as well as the TM40 pumper Carburetor.

• Include top cover gasket, jet needle E-ring and washer, throttle valve seal, pilot air O-ring, fuel joint O-ring, accelerator pump O-ring, needle valve O-ring, needle valve retainer screw, needle valve assembly, float bowl O-ring/gasket, overflow hose, float bowl screws, accelerator pump rod boot
• Genuine Mikuni parts properly replace worn or mistreated components for the TM42 carburetor
• Includes all the parts needed to rebuild TM42 carburetor

This kit includes all necessary components to repair your carburetor.

O.E.M. jet sizes are included in the kit.

• Each kit contains all necessary gaskets, O-rings, float valve and jets
• Complete kits to rebuild OEM carburetors

This Kit replaces vital components in the BST40 Carburetor including new a Float, Needle Valve, Gaskets, Seals, Diaphragm, Spring and Float Bowl Screws to return the stock Mikuni BST40 Carburetor to like-new operation. As a bonus we have included Viton o-rings for the float assembly and 4 stainless steel allen screws.

Replaces the stock screw. Easy adjustment, without a screwdriver, of fuel mixture while the bike is running. For Keihin FCR carburetors.

Repair leaking carburetor or worn out float needle assembly.

• Kit contains all necessary gaskets, O-rings, float valve and jets
• Supplied by the same supplier the OEMs use
• Complete kit to rebuild OEM carburetor

The Phillips screws in Japanese motorcycles are not really Phillips screws. They are actually Japanese Industrial Standard (JIS) screws that are very easy to strip with Phillips head drivers.

Comes with everything you need to freshen up your carburetor.

Replace the worn slide guide in your stock Mikuni BST carburetor before it causes additional wear to the needle and needle jet. There are wear indicators on the slide guide that help you recognize when it is time to replace your slide guide. New O-ring included. 

A new slide for the stock Mikuni BST carburetor.

Replace your worn out Mikuni stock drain hoses when they get old and brittle with a replacement hose set. 

These 3/16" hoses are measured and pre-cut to length. Kit includes all hoses that fit the Mikuni carburetor.

Genuine Keihin spring, washer, and oring for the fuel screw of FCR and FCR MX carbs.

Just the parts…
Fuel screw spring, washer, o-ring (fuel screw not included)

Genuine FCR-MX Carburetor Rebuild Kit

Not for the stock BST DR650 carburetor, Fits FCR-MX conversions Only

Complete kit to rebuild OEM carburetors.

Has your TM40 carburetor been sitting for too long and now needs to be rebuilt? Then what you need is this TM40 Rebuild Kit that contains Genuine Mikuni replacement parts.

This kit includes:

• Needle Clip and Washer
• Top Cover Gasket
• A/P Nozzle O-Ring, Plug and Rubber Cap
• Fuel Screw O-Ring, Washer and Spring
• Float Bowl O-Ring
• Pilot Fuel Screw
• Drain Plug O-Ring
• #3.8 Needle Valve Assembly
• O-Ring for the Starter Circuit and Needle Valve
• New Screws for the Float Bowl
• Vent Hose

• Complete kit from Moose Racing to rebuild the OEM carburetor
• Each kit contains all necessary gaskets, O-rings, float valve and jets
• Supplied to Moose Racing by the same supplier the OEMs use

Kientech Fuel Screw for Suzuki DRZ400S/SM with the Mikuni BSR 36mm carb only. This fuel screw does NOT work on Keihin carbs.

This is an O.E. replacement diaphragm for your BST40 carburetor.

Rebuild your crusty carburetor with parts from the same manufacturer the OEM companies use. Included in the kit are all necessary gaskets, O-rings, float valve and jets you need to rebuild your carburetor to like new condition.

• Includes all necessary parts to replace OEM-style fuel mixture screw with an extended screw for easy tuning
• Kit includes extended mixture screw, O-ring, spring and washer.
   

Included in this kit are the parts needed to repair a second generation TK carburetor. You get a new float bowl gasket, needle valve with O-ring, needle, mixture screw, and stock jets for the '01-'21 models kits.

This is a new Diaphragm Set for your 1987-2000 TK carburetor. If yours has cracked or ripped, here is a replacement.

A complete kit to rebuild and refresh your stock carburetor. Kit contains Genuine Mikuni replacement parts.

**Due to varying model requirements, this kit does not include main or pilot jets.

Each kit contains float bowl gasket (or o-ring), float valve assembly (or float needle) and o-rings to rebuild one OEM carburetor body.