Honda CRF450R 2021 Competition Handbook

Honda CRF450R 2021 Motorcycle manual cover
Pages 124
Year 2021
Language(s)
English en

Honda CRF450R 2021 Motorcycle Specification

The Honda CRF450R 2021 is a pinnacle of motocross engineering, designed to deliver top-tier performance and reliability. At its core, it features a 449cc liquid-cooled, single-cylinder, four-stroke engine with a Unicam® cylinder head, ensuring a robust power output and efficient fuel combustion. The engine is paired with a five-speed close-ratio transmission that allows for precise gear changes and optimal power delivery across various terrains.

The chassis of the CRF450R is constructed from a lightweight aluminum frame, providing excellent rigidity and handling characteristics. This is complemented by a revised geometry that enhances cornering stability and overall handling. The suspension system includes a Showa 49mm coil-spring fork upfront, which offers adjustable compression and rebound damping, and a Pro-Link® rear suspension with a fully adjustable Showa shock. These components work in tandem to absorb impacts and maintain traction on rough tracks.

The braking system is equally advanced, featuring a 260mm hydraulic wave disc with a dual-piston caliper at the front and a 240mm hydraulic wave disc with a single-piston caliper at the rear. This setup ensures powerful and consistent stopping performance under demanding conditions. The CRF450R's ergonomics are designed for rider comfort and control, with a narrower seat and a more compact bodywork that facilitates better movement and weight distribution.

Additional highlights include a redesigned exhaust system, which improves exhaust flow and contributes to the bike's overall power characteristics, and an updated electronics package featuring Honda Selectable Torque Control (HSTC) and three engine modes, allowing riders to tailor the bike's performance to their preferences and the track conditions. The Honda CRF450R 2021 stands as a testament to Honda's commitment to innovation and excellence in the motocross arena.

Honda CRF450R 2021 Motorcycle F.A.Q.

What is the recommended oil type and capacity for the Honda CRF450R 2021?

The recommended oil type for the Honda CRF450R 2021 is 10W-40, and the oil capacity is approximately 1.15 liters (1.21 US quarts) when changing the oil filter.

How often should I clean the air filter on my Honda CRF450R 2021?

It is recommended to clean the air filter after every ride in dusty conditions or every 5-10 hours of riding in less severe conditions. Regular cleaning ensures optimal engine performance.

What are the key steps to adjust the chain tension on a Honda CRF450R 2021?

To adjust the chain tension on a Honda CRF450R 2021, first, place the bike on a stand. Loosen the axle nut, adjust the chain adjuster bolts evenly on both sides to achieve a 1.2–1.6 inch (30–40 mm) slack, and then retighten the axle nut.

How can I troubleshoot starting issues with my Honda CRF450R 2021?

If the Honda CRF450R 2021 is having starting issues, check the battery charge, inspect the spark plug for wear or damage, ensure the fuel is fresh, and verify that the fuel pump is functioning.

What is the correct tire pressure for the Honda CRF450R 2021 for off-road use?

For off-road use, the recommended tire pressure for the Honda CRF450R 2021 is typically around 12 psi for both front and rear tires, but it may vary based on terrain and rider preference.

How should I maintain the suspension on my Honda CRF450R 2021?

Regularly check the suspension for leaks, clean the fork tubes after each ride, and have the suspension professionally serviced every 20-30 hours of riding or as needed for optimal performance.

What are common causes of overheating in a Honda CRF450R 2021, and how can they be resolved?

Common causes of overheating in a Honda CRF450R 2021 include low coolant levels, clogged radiators, and a malfunctioning thermostat. To resolve, check and fill coolant, clean the radiator, and inspect the thermostat.

How can I improve the braking performance on my Honda CRF450R 2021?

To improve braking performance, ensure that the brake pads are not worn, the brake fluid is at the correct level and not old, and the brake lines are free from air bubbles by properly bleeding them.

What should I do if I experience clutch slippage on my Honda CRF450R 2021?

If experiencing clutch slippage, check for worn clutch plates, ensure that the clutch cable is properly adjusted, and verify that the clutch basket and springs are in good condition.

How can I enhance the performance of my Honda CRF450R 2021 for racing conditions?

To enhance performance for racing, consider installing aftermarket exhausts, upgrading suspension components, adjusting ECU settings, and using high-performance air filters. Regular maintenance and tuning are also essential.