Honda CRF450RX 2017-2018 Service Manual

Total Motorcycle's own confirmed account frames the launch year's real impact directly: "when the Honda CRF450RX hit the scene last year, it blew everyone away. This was more than just a premier-class motocrosser with an electric starter. It's a serious off-road weapon fully optimized for trophy-class competition in enduros, hare scrambles, and GNCC racing." Ultimate Motorcycling's own confirmed long-term testing on the follow-up 2018 model found the suspension genuinely reworked for its actual mission: "the acceleration was ferocious, especially in the aggressive mapping mode, and the suspension settings and spring rates were a bit on the stiff side for off-road competition, thought ideal for a vet-style motocross track. The 2018 Honda CRF450RX is essentially the same bike as the previous year, however Honda opted to reduce a little weight by dropping the kickstart lever and swapping the old lead-acid battery out for a lightweight lithium-ion unit. Additionally, the ECU mappings and suspension valving have been optimized to increase rider 'usability.'"

Power comes from a 449.7cc liquid-cooled Unicam single, a 96.0mm x 62.1mm bore and stroke, a 13.5:1 compression ratio, fed by PGM-FI fuel injection, delivering a claimed 55 hp at 9,000 rpm and roughly 37 lb-ft (50 Nm) of torque at 6,500 rpm through a 5-speed transmission — genuinely the same fundamental engine as the closely related CRF450R motocrosser sharing this catalog, adapted specifically for closed-course off-road racing.

Autoevolution's own confirmed account details exactly what genuine hardware distinguishes the RX from the R version: "the final chain drive, less travel on the rear suspension, different tires, an 18-inch rear wheel as opposed to the 19-inch of the CRF450R, a smaller wheelbase, a larger fuel tank, and slightly more overall weight" — real differences built specifically for the demands of enduro, hare scramble, and GNCC-style racing rather than pure closed-circuit motocross. Total Motorcycle's own confirmed 2018 spec sheet lists a Pro-Link Showa single shock with adjustable spring preload, rebound, and compression damping offering 12.28 inches of travel, paired with a 49mm inverted Showa fork with matching adjustability.

Standard equipment for this exact range includes a sidestand for quick trail pit-stops, a quick-adjust clutch perch, a rubber-mounted aluminum handlebar for reduced rider fatigue, and an engine stop switch with an integrated LED indicator confirming the PGM-FI system is running correctly. Total Motorcycle's own confirmed 2018 pricing lists $9,249 USD MSRP. This exact fifth-generation configuration ran through 2020 before Honda's substantially revised 2021 update brought a new frame, lighter swingarm, single-sided muffler, hydraulic clutch, and standard handguards.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a 2017-2018 CRF450RX running the way it was built to.