Motorcycle Carburetor Rebuild Service

Send your carburetor or complete carb bank to Duff Moto MFG for professional cleaning, inspection, rebuilding and setup.

Our motorcycle carburetor rebuild mail-in service is built for customers who want the job done properly without relying on generic rebuild kits or guesswork. We work with Mikuni, Keihin and other carburetors used on vintage motorcycles, ATVs, dirt bikes, snowmobiles and other powersports machines.

Each carburetor is fully disassembled, professionally cleaned and inspected before reassembly. We check the fuel and metering components, clean internal passages, inspect floats and fuel valves, set float height, establish baseline mixture settings, bench synchronize multi-carb banks where applicable, and leak test the finished assembly.

The initial service price is a base rebuild price only. Rebuild kits and replacement parts are additional. Once the carburetor is disassembled and inspected, any worn, damaged, missing or unsuitable components we find may require replacement at an additional cost.

Required parts are selected based on the actual condition and application of the carburetor. Whenever possible, we use quality OEM, Mikuni, Keihin, Keyster, K&L and other proven carburetor components, along with trusted gasket products from established brands such as Fel-Pro, rather than unknown generic parts.

If we find damage or additional repairs that fall outside of a normal rebuild and would significantly increase the cost, we will contact you before proceeding.

If your machine has been modified with pod filters, exhaust changes, engine work or other performance modifications, please provide as much information as possible when placing your order. Jetting changes, tuning work and abnormal repairs may require additional parts or labor.

What Is Included in the Carb Rebuild

Every carburetor that comes through our shop receives a full disassembly, professional ultrasonic or chemical cleaning, and a thorough inspection before reassembly. We set float height, establish baseline mixture settings, bench synchronize multi-carb banks where applicable, and leak test the finished assembly before shipping it back to you.

Parts and Components

Required parts are selected based on the actual condition and application of the carburetor. Whenever possible, we use quality OEM, Mikuni, Keihin, Keyster, K&L and other proven carburetor components, along with trusted gasket products from established brands such as Fel-Pro, rather than unknown generic parts.

How It Works

1. Purchase the correct mail-in rebuild service for your carburetor setup.

2. Completely drain all gasoline from the carburetor.

3. Package the carburetor carefully and include your order number.

4. You are responsible for shipping the carburetor to Duff Moto MFG.

5. We inspect, clean and rebuild the carburetor.

6. Any required rebuild kits, replacement parts or additional repairs are added as needed.

7. We contact you for approval if anything outside of a normal rebuild requires significant additional work.

8. Return shipping from Duff Moto back to you is paid at checkout when purchasing the service.

9. Once the rebuild is complete, we package your carburetor and ship it back to the address provided with your order.

All gasoline must be completely drained before shipping.

Shipping Your Carburetor

Please package carburetors carefully to protect throttle shafts, linkages, fuel fittings, choke components and adjustment screws. We strongly recommend using a tracked shipping service when sending your carburetor to us.

Duff Moto specializes in carburetor repair and vintage applications, with a focus on using quality components and building each carburetor around the actual machine and application rather than simply installing a generic kit.