CRF450L / CRF450RL Engine Protection Guide

Choose protection by location

Look at where your bike makes contact on your usual routes. Rocky climbs, logs and deep ruts put different demands on protection than graded roads. Use the table below to identify the part that addresses each area.

For a bike regularly crossing rocks and logs, underside coverage is a practical first priority. Add radiator and chain-side protection based on your routes and current equipment. No guard makes the motorcycle immune to damage.

Compare two skid-plate approaches

Flatland Racing: aluminum construction and drain access

The CRF450L / CRF450RL Flatland Racing Skid Plate, part 24-87, uses 3/16-inch 5052 aluminum with welded side guards. It includes mounting hardware and instructions, plus clean-out slots and an oil-drain opening.

A black Flatland Racing version, part 24-87BK, is also listed. Choose the finish you prefer after checking coverage and fitment.

The drain opening is useful, but it is not a promise that every oil-service task can be completed with the plate installed. Confirm tool access, the oil's drain path and filter access on your assembled bike. Remove the plate when needed for cleaning or inspection.

T.M. Designworks: composite plate with integrated linkage coverage

The CRF450L / CRF450RL T.M. Designworks Full Coverage Skid Plate, part HOLG-465, uses composite plastic and includes an integrated linkage guard. Its material incorporates a silicone additive intended to help it slide over rocks and logs.

This is an option to compare when linkage coverage is part of your protection plan. Confirm compatibility if the bike has a lowering link or other linkage changes, and review the installation instructions for service access.

Choose by the complete design. Material alone does not establish which plate is best for every rider. Compare coverage, how the plate mounts, room around the engine and exhaust, replacement hardware and the work required at each service. The linked product pages show current prices and options.

Protect the radiators without crowding the cooling system

The CRF450L / CRF450RL Flatland Racing Radiator Guards, part 12-72, are sold as a pair, one for each side, with mounting hardware. Their aluminum construction and supporting mounts add protection around the radiators.

A guard over the radiator face and a brace supporting the radiator are related but distinct features. Compare the actual design and mounting points instead of relying on the word “guard” alone. Radiator protection does not increase cooling capacity or repair a bent, leaking radiator.

Before combining guards with a larger fuel tank or other accessories, confirm the exact combination. During installation, check:

• Clearance around the tank, shrouds and radiator mounts.
• Hose routing without pinching, stretching or rubbing.
• Space around the fan and its wiring.
• Open airflow passages and access for cleaning out mud.

After a fall, inspect the radiator and its mounts as well as the guard. A guard that looks intact does not rule out a coolant leak or shifted component.

Understand case savers and cover protection

Zeta case saver and front-sprocket cover

The CRF450L / CRF450RL Zeta Case Saver & Sprocket Cover, part ZE80-8032, combines a 2 mm pressed-aluminum case saver with an A6061 aluminum drive cover. It addresses the front-sprocket area rather than the underside of the engine.

Check clearance with your actual sprocket and chain, particularly if you have changed gearing. A case saver does not guarantee that a broken or derailed chain cannot damage the engine. Keep chain slack, alignment, lubrication and wear inspection within Honda's guidance for your year and riding conditions.

A clutch-cover guard is a different component

An add-on cover guard fits over a specific engine cover. A replacement clutch cover takes the place of the original cover and requires the appropriate sealing and installation procedure. Neither is the same as a chain-side case saver.

If outer-cover protection is your priority, send us your model year and current cover details so we can check the correct option. Do not assume an engine cover listed for another Honda 450 application will fit.

Treat magnetic plugs as a maintenance accessory

A magnetic drain plug can attract magnetically responsive wear particles, such as iron and steel debris. It does not collect every contaminant: aluminum particles and many other materials are not captured by an ordinary magnet.

It also provides no external impact protection for the drain opening or engine case. Continue using the correct oil filter and Honda's specified oil-change procedure and schedule. A magnet is not a reason to extend service intervals.

Before fitting any aftermarket plug or filter magnet, confirm the exact application, thread and sealing requirements, and internal clearance. A claimed magnetic reach by itself does not establish fitment, filtration performance or longer engine life.

For service supplies, review the CRF450L / CRF450RL Full Synthetic Oil Change Kit. Check the listed oil, filter and seals against your service requirements. Use the specified refill quantity for the service performed; the quantity supplied in a kit is not a refill instruction.

At oil changes, inspect the drained oil, filter and any magnetic collector. Unexpected chips, a marked increase in debris or new engine symptoms warrant diagnosis before further riding. A clean magnet alone does not establish that the engine is healthy.

Confirm fitment, then install without forcing it

The linked Flatland, T.M. Designworks and Zeta listings currently cover the 2019–2027 CRF450L / CRF450RL family. Use each product's application details for your exact year. Shared model-family fitment does not automatically cover every aftermarket tank, exhaust, sprocket or lowering link.

1. Read the exact instructions. Identify supplied brackets, fasteners and any hardware that must be reused.
2. Support the bike securely. Let hot engine and exhaust parts cool. If replacing a skid plate, support the motorcycle independently of the plate being removed.
3. Clean and inspect the mounting area. Check for bent mounts, damaged threads and existing leaks before covering anything.
4. Start fasteners by hand. Align the assembly before final tightening. If holes do not line up, stop and check orientation and fitment.
5. Check clearances. Review the shifter, brake pedal, exhaust, hoses and other nearby components. Verify the intended service openings are usable.
6. Finish to specification. Follow the manufacturer's tightening sequence, torque and thread-treatment instructions. Do not substitute a guessed universal torque value.

After the first ride and after significant impacts, inspect for loose hardware, cracks, deformation, leaks and fresh contact marks. Clean out packed mud and debris. Replace or repair damaged protection according to the manufacturer's guidance.

For help choosing a combination, contact CRF's Only with your year, riding terrain and existing modifications. You can also explore our CRF450L / CRF450RL Rider Guide for the rest of your build.

CRF450L / CRF450RL engine protection FAQ

What protection should I add first?

For rocky trails and log crossings, start by assessing underside coverage. Then evaluate radiator protection and the front-sprocket area. Choose around the terrain and equipment already on your bike.

Which skid plate includes linkage protection?

The T.M. Designworks HOLG-465 linked here includes an integrated linkage guard. Confirm clearance if you use an aftermarket linkage or lowering link.

Can I change the oil with the Flatland skid plate installed?

Flatland specifies an oil-drain opening. Check tool clearance and the drain path on your bike; that opening does not guarantee access for every filter or inspection task.

Do the Flatland radiator guards include both sides?

Yes. The 12-72 listing is a pair with one guard for each side and includes mounting hardware.

Will a case saver replace proper chain maintenance?

No. It adds protection around the front-sprocket area, but correct chain adjustment, alignment and condition remain essential.

Does a magnetic drain plug replace the oil filter?

No. It attracts certain metallic particles and does not capture every contaminant. Keep the correct filter and the prescribed maintenance schedule.