Honda CM400E Parts & Accessories

Honda CM400E Parts & Accessories

Honda's CM series brought the parallel-twin engine format into a comfortable, approachable cruiser package that appealed to new riders and experienced commuters alike. The Honda CM400E runs a 395cc SOHC parallel-twin in a standard upright ergonomic chassis positioned between the low-slung Custom and the sporty CB400. These machines share a great deal of engineering DNA with the CB series, making parts availability reasonable through specialty suppliers. Riders keeping a CM on the road need carb hardware, clutch components, and chassis consumables that match OEM specifications.

Popular Upgrades

Frequently ordered parts for the CM series include Keyster carburetor rebuild kits, Barnett clutch friction plates and springs, NGK spark plugs, Emgo exhaust pipes and heat shields, fork seals, drive chain and sprocket sets, and Yuasa batteries. Barnett clutch kits provide better engagement feel than worn OEM plates. NGK plugs in the correct heat range keep combustion clean and prevent fouling on low-mileage runs.

Performance and Handling

The CM series front forks use conventional oil-damped tubes that benefit from fresh seal sets and oil every 20,000 miles or two years. Rear shocks can be replaced with aftermarket units at the correct extended and compressed lengths to maintain the CM's relaxed riding geometry. Drive chain stretch accelerates sprocket wear rapidly, so replacing chain and front and rear sprockets as a matched set is the most cost-effective maintenance approach. The drum or disc brake hardware is straightforward and responds well to fresh pads or shoes.

What carburetor kit fits a Honda CM400E?

The CM400E uses dual Keihin CV carburetors. Keyster rebuild kits supply the correct jets for both carbs, along with needles, float valves, and all gaskets. Rebuilding both units at the same time with synchronized slides prevents the uneven power delivery common on partially serviced twins.

What clutch kit fits a Honda CM series?

Honda CM parallel-twins use a wet multi-plate clutch. Barnett clutch kits sized to the CM displacement include the correct number of friction plates and steel plates with the right thickness and OD. A fresh clutch spring set is always recommended alongside new plates to restore full clamping pressure and eliminate slippage under hard acceleration.

Why These Parts Fit Right

Parts are listed with the specific CM variant and model year required for accurate fitment. The CM400E shares many components with the CM400T and CB400, and cross-compatibility is noted where applicable. OEM-equivalent specifications mean installation requires only basic tools.

CM owners interested in related content can browse the exhaust systems collection, the suspension catalog for fork and shock upgrades, or explore air intake upgrades available for other Honda models.