Honda CB300R 2018-2021 Service Manual

Roadracing World's own announcement of this bike's American arrival confirms exactly what void it filled: "originally unveiled in November at Milan's EICMA motorcycle show, the model shares the same Neo-Sports Café aesthetic as the CB1000R... pared down to the essentials, it embodies motorcycling culture and urban fun." MCN's own review confirms the genuine gap Honda's own lineup had been carrying for over a decade before this bike arrived: "such a bike has been missing from the firm's model range as while the faired CBR250R (which evolved into the CBR300R) has been around since 2011, you have to go way back to the CB250, which was discontinued in 2003, to find a naked model that fulfils such a role." That same review found the small-displacement single genuinely more satisfying than its spec sheet might suggest: "it is easy to dismiss a 286cc single as a bike designed for the far eastern market that has been forced upon Europe, but MCN was both surprised and impressed by the CB300R."

Power comes from a 286cc liquid-cooled DOHC single-cylinder engine, 4 valves, delivering a claimed 30.3-31 hp (22.9kW) at 8,500 rpm and roughly 20.3 lb-ft (27.5 Nm) of torque, fed by fuel injection through a 6-speed transmission with a genuine assist-and-slipper clutch. Lings Honda's own product materials confirm the clutch's practical function: "the addition of an assist/slipper clutch allows smooth shifts and manages rear wheel 'hop' on rapid downshifting and hard braking" — real, functional technology on a bike positioned as an entry-level stepping-stone rather than a stripped-down budget model.

Honda's own 2021 feature materials confirm the genuinely sophisticated frame engineering hiding underneath this bike's minimalist styling: "constructed from high-tensile steel tubing and pressed steel, with the steel pivot plate separated from the main frame. Through this design, the main frame between the head and seat rail is free from the stress applied to the rear wheel, which enabled each piece to be optimized in terms of strength and profile, primarily through the use of thin steel pipe and steel sheet." WebBikeWorld's own detailed feature breakdown confirms the genuine componentry Honda applied to this small-displacement platform: "the CB300R's 41mm inverted fork offers a smooth ride with compliant damping. The supple spring rate is just right for a bike this size" — a Showa SFF-BP inverted fork, per Lings Honda's own confirmed spec, delivering real sportbike-derived suspension technology rather than a basic conventional fork.

Roadracing World's own launch announcement confirms genuinely premium electronic safety equipment available on this small-displacement machine from day one: "the CB300R also boasts premium features like an available inertial measurement unit-based ABS, LCD display, and full LED lighting" — a real IMU-based ABS system, genuinely uncommon at this price point and displacement class when the bike launched. WebBikeWorld's own confirmed 2021 specification lists an LCD display showing engine rpm, fuel level, and gear position, alongside a genuinely distinctive dual-chamber underslung exhaust — WebBikeWorld's own account confirms "the outlet on the right side. The high-flow design contributes to an ultra-linear throttle response." Front braking uses a radial-mounted 4-piston caliper on a hubless floating disc, with lightweight aluminum wheels contributing to a genuinely low curb weight around 144kg (317 lbs) wet. This platform shares its fundamental engine and chassis architecture with the smaller CB125R and larger CB650R/CB1000R siblings that filled out Honda's Neo Sports Café family across the same era, with this exact 2018-2021 span representing the CB300R's original launch specification before Honda's subsequent Euro5-driven engine and equipment updates.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a 2018-2021 CB300R running the way it was built to.