Carburetor Rebuild Kit for Honda CT90 - "Trail 90" motorcycles
This carburetor rebuild kit is the result of extensive research and testing, designed to fit the OEM Keihin carburetor found on 1969-1977 Honda Trail 90 (K1-K8) models. If the brass components inside your vintage Honda CT90 / Trail 90 carburetor are beyond cleaning and a gasket change, it's time for a rebuild.
Our carburetor rebuild kit is the most complete and comprehensive on the market. It fits the "two-screw float bowl" Keihin carburetor, which features a rectangular-shaped float bowl secured with two screws. The float will be made of brass—if your carburetor has a plastic float, it may indicate an aftermarket unit.
NOTE 1: Many aftermarket clone carburetors for the Honda CT90 are available on the market. This kit is ONLY for the OEM Keihin Honda carburetor with a two-screw float bowl.
NOTE 2: Honda CT90 K0 (four-screw float bowl) and CT90 '78-'79 (round float bowl) use different carburetor designs that are NOT COMPATIBLE with this kit.
If your main and idle jets are different from those included in the rebuild kit, it is recommended to reuse them. Honda made numerous jetting changes during CT90 production, so it's best to start with the original size before making any adjustments. The emulsifier tube/discharge nozzle must also be reused.
Altitude knob gaskets and carburetor floats are not included in the kit but are available as optional add-ons.
Thoroughly clean all carburetor components before reassembly. The emulsifier tube has an O-ring in the middle of the body—ensure it is replaced and lubricated during installation. Use a non-metallic punch to press it into place. Set the float height to 20 mm and start with the slide needle in the middle position for preliminary tuning.
