2019–2027 Honda Cross-Country
Set up your RX for roots, rocks and longer race days. Find the right protection, fuel-range options, suspension and service parts, with specifications that belong to your cross-country bike.
All Honda CRF Rider GuidesKnow Your Bike
The CRF250RX combines Honda’s 249cc DOHC engine and electric start with equipment aimed at off-road competition. Its 18-inch rear wheel, larger fuel tank, sealed chain and off-road suspension setup matter when selecting parts.
The RX is closely related to the CRF250R, but tires, range, tuning and service planning deserve RX-specific attention. It is also a different platform from the CRF250X enduro bike, CRF250F trail bike and CRF250L dual-sport.
Start Here
Confirm the year and RX designation, then note changes to the tank, exhaust, suspension and wheels.
Find Your Model YearInspect the radiator, underside, levers, chain guide and fuel range before planning a longer loop or race.
Plan ProtectionEstablish the engine-service baseline, measure sag and set controls before changing power delivery.
Review RX MaintenanceModel-Year Roadmap
The RX begins with the 2019 model year. These groups help narrow your search; individual parts can fit shorter or overlapping ranges. On a phone, swipe across the table to see every column.
| Model years | Platform reference | Buying priority |
|---|---|---|
| 2019–2021 | First RX platform / dual exhaust | Use RX-specific tank, seat, wheel and suspension applications. Confirm the exact model year for engine and electronic parts. |
| 2022–2024 | Revised platform / single exhaust | Check the 2022-generation exhaust, chassis and airbox application. Earlier dual-exhaust components do not transfer by model name alone. |
| 2025–2027 | Later chassis and intake applications | Choose parts that include this generation. CRF’s Only has confirmed 2026-to-2027 carryover; individual options still need the correct RX selection. |
A shared R/RX product title does not mean every R year also exists as an RX model. Identify the motorcycle by its model year and full designation, rather than a graphics kit or purchase date.
2026–2027 Quick Reference
These figures are for the U.S. 2026–2027 CRF250RX. Use the exact-year manual for an older RX or a modified bike, especially for oil quantities, spark plugs and procedures.
Use the RX section of Honda’s 2027 owner’s manual or the matching 2026 manual. A sprocket change can alter required chain length. The engine and gearbox share an oil supply; follow Honda’s fill and level-check procedure. Avoid oils labeled “Energy Conserving” or “Resource Conserving.”
View Honda’s CRF250RX specificationsR Versus RX
Compare these current stock references before ordering a motocross tire, choosing a fuel tank or planning your service routine. Swipe across the table on a phone.
| Item | 2026–2027 CRF250RX | 2026–2027 standard CRF250R |
|---|---|---|
| Front tire | 90/90-21 | 80/100-21 |
| Rear tire / wheel | 110/100-18 / 18-inch | 100/90-19 / 19-inch |
| Stock fuel tank | 8.0L / 2.11 US gal | 6.3L / 1.66 US gal |
| Stock chain type | Sealed #520 | Non-sealed #520 |
| Gearbox | Five-speed manual | Five-speed manual |
| Competition schedule example | Oil/filter: every 4 races / about 15 hours | Oil/filter: every 6 races / about 15 hours |
Build for Your Terrain
Choose the problem you want to solve, then match the part to your model year. Prices, available options and stock status are on the product pages. For a 2027 order, ask us to confirm the selection if a product’s year option still stops at 2026.
Protection & controls
Rocks, roots and close trees make protection useful on the RX. Match skid plates and radiator guards to your generation, then check handguard clearance through the full steering range.
A composite skid plate adds coverage around the frame rails, water pump and ignition cover for rocky trails and race courses.
Aluminum wraparound bars and replaceable shields add protection around your hands and levers in brush and tip-overs.
Billet aluminum guards add front and side impact protection around the radiators while preserving airflow openings.
Folding brake and clutch levers can swing outward in a fall to help reduce lever damage.
Suspension & comfort
Start with rider sag, spring rate and control position. Carry your normal riding gear and hydration pack when checking setup. Lowering and seat changes should answer a specific comfort or fit problem.
Choosing the right rear spring helps you reach your sag target with support suited to your weight and riding pace.
A different fork spring rate lets earlier RX riders adjust front-end support when the existing springs do not suit their weight.
A replacement suspension link offers approximately 1.5 or 2 inches of rear lowering for riders who need an easier reach to the ground.
A wider seating area provides more support during longer seated stretches while retaining a stock-like front contour for movement.
Fueling & range
The RX already has fuel injection and off-road-oriented engine settings. Decide whether your next step is a different fuel and ignition map, a coordinated exhaust package, or more fuel capacity between stops.
The Vortex X10 provides 10 fuel and ignition maps plus low-, mid- and high-throttle fuel trims for a competition setup matched to your engine and exhaust.
This package combines a titanium FMF Factory 4.1 slip-on, titanium MegaBomb header and pre-tuned Vortex ECU.
The Acerbis 3.1-gallon tank increases fuel capacity for rides or races with longer gaps between fuel stops.
The IMS 3.0-gallon tank adds capacity to the first-generation CRF250RX for longer stretches between refueling.
Exhaust & intake
Consider sound limits and spark-arrestor requirements before choosing an exhaust. A clean, properly oiled and seated air filter remains a priority in dusty off-road conditions.
The FMF Q4 slip-on combines sound-control chambers with a U.S. Forestry-approved spark-arrestor screen.
The Yoshimura RS-12 stainless full system replaces the complete exhaust on the 2022–2024 RX generation.
A spare dual-stage foam filter makes it easier to start the next dusty ride with a clean filter ready to install.
This replacement end cap converts the matching stock muffler to a spark-arrested setup with a removable approved screen.
Drivetrain
Inspect the chain, both sprockets and the guide together. Choose tooth counts for your terrain and confirm chain length and axle adjustment before changing the gearing.
A narrow X-ring chain retains lubrication at the joints while providing a replacement option for a worn 520 drive chain.
A grooved nickel-chromoly front sprocket replaces worn teeth or lets you change final gearing with a different tooth count.
The Edition 2 guide combines a protective body with a replaceable wear pad for chain guidance in rough terrain.
The TwinRing combines an aluminum center with a steel tooth ring for riders balancing sprocket weight and wear life.
Maintenance & engine service
Follow the competition maintenance schedule for your model year and inspect more often in demanding conditions. Service products should match the engine and suspension actually installed on the bike.
The NGK SILMAR9A9S is the specified replacement plug application for later CRF250RX models.
The HF116 is a replacement oil filter to have ready when the engine reaches its scheduled oil-and-filter service.
An SKF oil seal and dust seal replace worn sealing parts when servicing a leaking fork leg.
CRF’s Only reconditions your cylinder head with inspection, performance porting, valve-seat work and replacement race-series seats and guides.
Build Your Setup
Choose a starting point for your motorcycle and riding. Add parts as they address a real need.
Build 01
Build 02
Build 03
Build 04
Keep It Ready for the Next Loop
The RX is a competition motorcycle with race- and hour-based service. Record both, and use the RX schedule in Honda’s combined R/RX handbook. On a phone, swipe across the table for the full details.
| Service priority | RX interval / timing | What matters |
|---|---|---|
| Before every ride | All RX years | Check oil, coolant, fuel, filter sealing, controls, brakes, tires, chain, spokes, leaks and fasteners. |
| Air filter | Clean after each race / about 3.5 hours; more often in dust | Clean and oil the correct filter and inspect the airbox seal. Honda calls for service after every moto in dusty conditions. |
| Each race / about 3.5 hours | 2026–2027 RX competition schedule | Inspect oil level, plug, cooling, controls, clutch, brakes, chain, wheels, suspension and fasteners; follow the full RX checklist. |
| Every 2 races / about 7.5 hours | Chain and linkage | Replace the drive chain and lubricate swingarm/shock linkage as scheduled. |
| Every 4 races / about 15 hours | Engine service | Inspect valves/decompressor; replace engine oil, oil filter, piston, rings and piston pin as scheduled. |
| Every 6 races / about 22.5 hours | Suspension and steering | Replace fork oil and inspect steering-head bearings. |
| Every 8 races / about 30 hours | Fuel-system service | Replace the fuel line and fuel-pump filter; Honda also specifies annual replacement. |
| Oil quantity and specification | Use the exact-year RX reference | For 2026–2027, use 1.08L with filter or 1.05L after draining only, then check the level using Honda’s procedure. The engine and transmission share lubrication. |
| Sealed drive chain | Inspect before riding; clean and lubricate after every ride | Protect the sealing rings, check tight spots, sprocket wear and alignment, and use the installed gearing to determine chain length. |
| Fuel range | Before a longer route or race | Measure consumption in similar terrain. Plan a reserve and fuel stops; a larger tank alone does not establish a guaranteed distance. |
| Hard starting or weak response | Diagnose before adding performance parts | Check fuel, intake sealing, valve clearance, compression, battery condition and EFI faults. |
| Used bike or severe conditions | Inspect sooner when history is uncertain | Look for dirt or water ingestion, impact damage, worn linkage and steering bearings, leaking seals and overdue engine service. |
These are Honda’s 2026–2027 RX competition intervals. Follow the RX race counts and approximate-hour intervals, including break-in service and the complete inspection list in the 2027 Competition Handbook or 2026 handbook. Inspect and service more often in severe conditions; use an exact-year manual for an older bike.
Common Questions
Fitment, stock sizes, fuel range, setup and RX service priorities.
This guide covers U.S. Honda CRF250RX models from 2019 through 2027. The RX starts with the 2019 model year. Some shared R/RX products list earlier R years; those do not establish an earlier RX model year.
CRF’s Only has confirmed 2026-to-2027 carryover for the CRF250RX. The guide includes that carryover while retaining earlier year breaks. Choose the RX application and exact year for each part.
The RX is set up for cross-country use, with an 18-inch rear wheel, larger tank, sealed chain, sidestand and off-road suspension tuning. It shares the broader engine family with the R, but tires, tanks, tuning and service race counts need their own checks.
The 2026–2027 RX uses 90/90-21 front and 110/100-18 rear tires. Confirm the wheel fitted to a used bike before ordering tires, tubes or inserts.
The 2026–2027 reference is 13 teeth front, 50 rear and a sealed #520 chain with 114 links. The listed stock chain is DID 520MXV5-114ZB. Different gearing can change the length and adjustment range required.
For the U.S. 2026–2027 CRF250RX, Honda specifies NGK SILMAR9A-9S with a non-adjustable 0.8–0.9mm gap. Older years differ: the 2021 RX manual specifies R0451B-9. Check the exact-year manual before ordering.
The 2026–2027 reference is 1.08L / 1.14 US qt with a filter change, or 1.05L / 1.11 US qt after draining only. The engine and gearbox share oil. Confirm the level using Honda’s procedure.
The current stock tank is 8.0L / 2.11 US gal. Distance depends on terrain, pace, gearing, conditions and engine setup. Measure your own consumption and keep a reserve when planning a longer loop.
Confirm the exact RX year, seat and shroud compatibility, fuel-pump requirements and any interference with protection or accessories. Consider how extra fuel weight affects the bike’s feel, and check for leaks after installation.
No. The 2026–2027 RX has a five-speed manual gearbox. Do not assume cross-country equipment gives it the gearbox or road-use characteristics of an X or L model.
The U.S. CRF250RX platform covered here uses fuel injection and electric start. Carburetor jetting kits are not an RX tuning solution; use year-specific EFI components and calibration.
Plan the exhaust, intake and calibration together around the exact year and RX application. Tell us the engine configuration and your riding goals. Confirm any included map switch, optional tuner or other parts when comparing packages.
Start with worn parts and overdue service, then set sag and controls. Protection, tires and fuel range often matter early in an off-road build. Choose power-delivery changes once the engine and chassis have a sound baseline.
Use the RX table in Honda’s handbook. For example, current RX oil/filter service is scheduled every 4 races / about 15 hours, while the R lists 6 races for the same approximate hours. Follow the model-specific counts and the full inspection list.
No. The RX is a liquid-cooled competition platform with a high-performance DOHC engine and race-service schedule. The air-cooled F trail bike and L dual-sport have different equipment, maintenance needs and parts applications.
Confirm the model year and RX identity, request a cold start and review engine-hour and service records. Inspect the intake for dirt, the frame and radiators for impacts, and the suspension, linkage, steering and wheel bearings for wear. Check aftermarket tanks, exhausts and electronics against the actual year.
Build Your CRF250RX
Shop CRF250RX parts or ask us to help match protection, tank capacity, suspension and engine setup to your model year and riding.
