Honda has released information about its 2019 CRF motocross bikes including a new model to the lineup, the CRF450RWE ("Works Edition"), a factory-replica version of the CRF450R motocross bike. The standard model CRF450R receives a number of updates to the engine and chassis, as does the CRF250R, which was all-new last year.

honda CRF450RWE
The CRF450RWE (“Works Edition”) is a new model to Honda’s 2019 motocross lineup.Courtesy of Honda

Honda CRF450RWE

The CRF450RWE features the same updates the standard CRF450R receives for 2019 along with several upgrades, including a specially designed cylinder head with hand-polished ports designed to increase low-end and midrange torque, especially between 5,000 and 6,000 rpm. Other engine modifications to the engine include a Yoshimura RS-9 titanium slip-on muffler, and special ECU settings.

honda CRF450RWE
The CRF450RWE has a specially designed cylinder head with hand-polished ports, a Yoshimura RS-9 titanium slip-on muffler, and special ECU settings.Courtesy of Honda

The Showa suspension components differ from the units found on the standard model in that the fork legs and shock shaft receive a titanium-nitride coating for a factory look designed to increase traction and bump absorption. The Works Edition also wears the same graphics as Team Honda HRC’s Ken Roczen’s racebike, including a Throttle Jockey factory seat cover. It also has D.I.D LT-X rims, a gold RK chain, and black triple clamps. The CRF450RWE will be available in August 2018 for $11,499.

honda CRF450R
The CRF450R engine has an updated cylinder head design with changes near the exhaust ports aimed at achieving improved exhaust efficiency and increased power across the rev range.Courtesy of Honda

Honda CRF450R

The 2019 Honda CRF450R features updates to the engine, suspension, and chassis. The Unicam engine has a new cylinder head design with revisions near the exhaust ports aimed at achieving improved exhaust efficiency and increased power across the rev range. The kickstarter assembly has been removed from the side case of the engine and to utilize that space, the CRF450R has a new exhaust with a larger pipe diameter and a different design at the branching location with the goal of increasing power. Whereas the 2017 and 2018 model CRF450R had 31.8mm (approximately 1.25 inch) pipes, the 2019 model's right pipe is 35mm (approximately 1.4 inches) and the left pipe is 43mm (approximately 1.7 inches). Additionally, the total tube length (from exhaust port to muffler end) has been increased by 98mm (approximately 3.9 inches) on the right and 187mm (approximately 7.4 inches) on the left.

honda CRF450R
The CRF450R has a new exhaust with a larger pipe diameter and a different design at the branching location, intended to increase power.Courtesy of Honda

Further engine changes include clutch lifter and pressure plate designed to improve durability with better oil flow to the clutch plates and friction discs. A new scavenge pump design uses two 12mm pumps, up from a single 16mm pump, to provide more lubrication and reduced friction in the engine aimed at improving peak performance and over-rev. A new piston oil jet uses five nozzle holes and a refined pattern to improve cooling and reduce knocking, both of which are said to enable a precise ignition-timing setting for a better power delivery. The final changes made to the powerplant are the addition of a shift sensor, HRC launch control, and updated engine mode select options.

The suspension components have also received changes for 2019, including revised settings and the use of lower friction oil in the Showa 49mm coil-spring fork and a revised shock linkage. The shock linkage was changed to work better with the new swingarm, which was redesigned to have better rigidity and be lighter. The aluminum frame has also been updated, designed to improve traction and cornering feel along with reducing weight. The top triple clamp now has two clamp locations to allow the handlebar to be moved back and forth by 26mm (approximately 1 inch). The clamp is reversible and enables an additional 10mm (approximately 0.4 inch) of adjustment from the base position as well. The handlebar is now a black Renthal Fatbar and is positioned 15mm (approximately 0.6 inch) lower than the previous year model. Also, the front number plate has been redesigned to accommodate the new handlebar in any of the four available positions.

honda CRF450R
The CRF450R has a new swingarm and the aluminum frame has been updated as well.Courtesy of Honda

The front brake setup has also been changed with a lighter front brake caliper that mimics the race team’s and uses a pair of 30mm and 27mm pistons, whereas the previous models used identical 27mm pistons. The front brake hose has also been updated with reduced expansion while the newly shaped footpegs are 20 percent lighter and are designed to shed mud more easily. Lastly, the bike now has black rims and the fork guards are new and offer better coverage. The CRF450R will be available in August 2018 for $9,299.

honda CRF250R
To help improve bottom-end power, the CRF250R engine receives a new cam profile, revised intake and exhaust port geometry, and a new 44mm throttle body.Courtesy of Honda

Honda CRF250R

The CRF250R was all-new last year, and the 2019 model features a number of updates designed to improve upon it. To increase bottom-end power, the DOHC engine receives a new cam profile, revised intake and exhaust port geometry, and a new 44mm throttle body. The bike also has a new piston oil jet that uses five nozzle holes instead of four, designed to improve piston cooling efficiency and reduce knocking while enabling a more precise ignition timing setting for a better power delivery. The right-side exhaust pipe has been shortened by 50mm (approximately 2 inches) to maintain the bike's high-rpm power while the AC generator is all-new and claimed to be lighter than the previous unit.

2019 honda crf250r
The CRF250R’s right side exhaust pipe has been shortened by 50mm (approximately 2 inches) and the AC generator is all-new and claimed to be lighter than the previous unit.Courtesy of Honda

Like the CRF450R, the CRF250R comes with a Renthal Fatbar that sits in a four-position-adjustable top clamp, a new engine guard, new fork guards that offer more coverage, a new front brake caliper and pistons, an updated front brake hose, newly shaped footpegs, HRC launch control, updated engine mode select options, and black rims. The CRF250R will be available in September 2018 for $7,999.