2004–2009Older-bike protection
Flatland Racing Skid Plate
Protect the underside of a 2004–2009 CRF250R with a 3/16-inch aluminum plate and welded engine guards.
- Mounting hardware included
- Built-in clean-out slot and oil-drain access openings
2004–2027 Honda Motocross
Honda CRF250R Rider Guide
Find your generation. Get the stock specs, maintenance priorities and parts that make sense for your CRF250R—from a carbureted rebuild to a current race setup.
All Honda CRF Rider GuidesKnow Your Bike
A great CRF250R setup starts with the right generation.
The CRF250R is Honda's liquid-cooled 250-class motocross four-stroke. Its name has stayed familiar, but its engine, fueling, starting system, suspension and chassis have changed substantially since 2004. A part that fits one generation can be completely wrong for another.
2027 fitment is included: CRF's Only has confirmed carryover from the 2026 CRF250R. Match every part to its listed model-year range and the equipment on your motorcycle, especially if a previous owner has changed the engine, forks, wheels or exhaust.
CRF250R, RX, Works Edition and CRF250F are different applications
The R is the motocross bike, the RX is the cross-country version and the RWE / HRC Works Edition has its own equipment. The air-cooled CRF250F is a separate trail platform. Shared displacement or similar plastics do not establish compatibility; order by the complete model designation and year.
Start Here
Three useful first steps
- 01
Identify the bike
Confirm the VIN/model year, exact model and any engine or suspension swaps before you shop.
Find Your Generation - 02
Establish a service baseline
Record engine hours, check the intake and fluids, and inspect the valves, drivetrain and suspension condition.
Plan Your Maintenance - 03
Solve the biggest riding issue
Set sag and controls first. Then choose parts for the actual problem: traction, response, protection or worn components.
Choose Your Upgrades
Model-Year Roadmap
Which CRF250R do you own?
These groups help you navigate the major changes. Individual parts often have narrower or overlapping year ranges. On a phone, swipe across the table to read each column.
| Model years | Platform reference | What matters when buying parts |
|---|---|---|
| 2004–2009 | Carbureted Unicam / kickstart | Start with carburetor condition, valve history and exact-year engine parts. Exhaust layout and chassis fitment change within this group. |
| 2010–2013 | Fuel-injected Unicam / kickstart | Use EFI-specific diagnostics and an ECU matched to the year. Carburetor jetting kits do not apply. |
| 2014–2017 | Later Unicam / EFI / kickstart | Confirm exact chassis and exhaust application. The 2015–2017 Showa SFF-TAC air fork needs a different setup approach from a coil-spring fork. |
| 2018–2021 | DOHC / EFI / electric start | A new engine generation and starting system. Confirm year-specific engine, electronics and dual-exhaust applications. |
| 2022–2024 | Revised DOHC platform / single exhaust | Check 2022-generation chassis, intake and exhaust fitment; do not assume 2018–2021 components transfer. |
| 2025–2027 | Latest chassis generation | Start with parts specifically listed for this platform. CRF’s Only has confirmed 2026-to-2027 carryover; RX and RWE still require their own application check. |
Use the model year, rather than the sale date or graphics, to identify your bike. A generation heading is a shopping aid, not a guarantee that every part fits every year in that group.
Latest-Model Quick Reference
CRF250R stock specifications
The references below are for the standard U.S. 2026–2027 CRF250R. Earlier CRF250R years, the RX and the Works Edition can use different plugs, oil quantities, gearing and tires. Check the installed parts before ordering.
- Front tire
- 80/100-21
- 21-inch front wheel; standard CRF250R
- Rear tire
- 100/90-19
- 19-inch rear wheel; standard CRF250R
- Front sprocket
- 13 tooth
- Factory standard final-drive reference
- Rear sprocket
- 50 tooth
- Pair with the correct front sprocket and chain
- Drive chain
- #520 / 114 links
- Stock DID 520DMS-114RB with 13/50 gearing
- Spark plug
- NGK SILMAR9A-9S
- 0.8–0.9mm gap; do not adjust the gap
- Engine
- 249cc DOHC
- Liquid-cooled four-stroke; four valves
- Fuel system
- PGM-FI / 44mm
- Electronic fuel injection; 44mm throttle body
- Transmission
- 5-speed
- Manual gearbox; cable-operated clutch
- Starting
- Electric
- Electric start introduced for 2018
- Oil with filter
- 1.14 US qt
- 1.08L; after drain only: 1.05L / 1.11 US qt
- Oil specification
- SAE 10W-30
- JASO MA; API SJ or higher per Honda
- Seat height
- 37.6 inches
- Stock standard CRF250R reference
- Fuel capacity
- 1.66 US gal
- 6.3L; minimum 91 pump octane
- Brake discs
- 260 / 240mm
- Front / rear hydraulic disc brakes
- Compression ratio
- 13.9:1
- Stock engine reference
The current stock chain reference is 114 links with 13/50 gearing. A different sprocket combination can require a different length. Earlier spark plugs and oil capacities also differ, so use the Honda manual for your exact year rather than applying these numbers to every CRF250R.
View official Honda CRF250R specificationsChoose Your Goal
CRF250R parts and upgrade guide
Choose a section below, then match the product’s years to your bike. Product pages have the available options, current price and stock status. For a 2027 order, contact us if the year selector still stops at 2026.
Protection & Rider Contact
Protect the vulnerable areas and improve boot support
Choose protection around your frame generation and riding conditions. Skid plates and radiator guards need to fit the actual chassis, while footpegs should work with the rider’s control positions.
2025–2027Current chassis protection
T.M. Designworks Skid Plate
Add composite coverage around the frame rails, water pump and ignition cover on the latest CRF250R chassis.
- Impact-absorbing plastic construction
- Replaceable hardware; check access around installed accessories
2022–2027Radiator protection
Bullet Proof Designs Radiator Guards
Billet-aluminum guards add frontal and side support around radiators that are exposed to roost and impacts.
- Machined from 6061-T6 aluminum
- Inspect radiator alignment and cooling-system condition before fitting
2004–2027Boot support
Zeta Aluminum Footpegs
A 57mm-wide platform and stainless traction pins give riders more boot support when standing, braking and changing direction.
- CNC-machined forged aluminum
- Check shifter, brake-pedal and peg-return movement after installation
Fit the bike you have: Check interference with the exhaust, hoses, brake pedal and any other protection already installed. Recheck mounting hardware after the first ride.
Suspension, Brakes & Chassis
Make the chassis consistent before chasing more power
Start with healthy fork seals, the right spring support, dependable brake feel and a sound chain guide. A small service repair can be more useful than a major performance purchase.
Identify the forkConfirm model year and any aftermarket fork conversion.
2015–2017 air forkUse the Showa SFF-TAC air-pressure procedure for the installed system.
Coil-spring forkChoose a year-specific spring rate and balance it with the rear.
Service before tuningCheck seals, oil, shock and linkage condition before adjusting around a problem.
2025–2027Spring support
Race Tech Fork Springs
Match the latest-generation fork to rider weight and pace with the appropriate spring rate, then recheck chassis balance and sag.
- For the 2025-generation fork
- Choose the rate for the rider; these are not a 2015–2017 air-fork conversion
2015–2027Fork service
SKF Fork Seal Kit
Replace worn or leaking seals before trying to cure inconsistent fork action with damping adjustments.
- One oil seal and one dust seal per kit
- One fork leg only; order two kits for both legs.
2007–2027Chain-guide support
T.M. Designworks Edition 2 Chain Guide
Replace a damaged or worn guide with a design that uses a replaceable wear pad and extends forward around the mounting area.
- Inspect the swingarm mounting bracket first
- Check the listed sprocket-size limits for your gearing
2004–2027Front brake service
Honda OEM Front Brake Pads
Restore the front brake with an OEM pad pair when the existing pads are worn or contaminated.
- Front caliper application
- Inspect the rotor and caliper; follow the bedding procedure after installation
Set a repeatable baseline: Measure race sag in full riding gear, record the clickers and evaluate one change at a time. Leaking seals and worn linkage bearings need service before meaningful suspension tuning.
Carburetion, EFI & Race Packages
Match the fueling path to your engine generation
For 2004–2009, start with the carburetor and jetting. Later bikes use EFI; choose year-specific fuel and ignition control, or a matched exhaust-and-ECU package for a planned race build.
2004–2007Early carburetor tuning
JD Jetting Kit: 2004–2007
Choose the early-year kit when you need to tune fuel delivery for a healthy carbureted CRF250R.
- Includes custom needles and main jets
- Set up for your altitude, temperature, engine and exhaust
2008–2009Later carburetor tuning
JD Jetting Kit: 2008–2009
Use the separate kit for the final two carbureted CRF250R model years when refining throttle response and fuel metering.
- Year-specific needles and main jets
- Diagnose intake leaks, valve issues and carburetor wear before tuning
2018–2027EFI fuel and ignition
Vortex X10 ECU
Choose fuel and ignition calibration for your exact CRF250R year and engine setup, with ten programmed maps and low-, mid- and high-throttle fuel trims.
- Select the correct year and configuration when ordering
- Closed-course competition only; handlebar switch is optional
2025–2027Complete race package
FMF 4.1 + Vortex ECU Combo
Plan the exhaust and calibration together with the titanium Factory 4.1, titanium MegaBomb header and a pre-tuned Vortex ECU.
- For the latest CRF250R platform
- Closed-course competition only; confirm the engine and intake configuration
Buy the right solution: A jetting kit or ECU cannot correct tight valves, poor compression, an intake leak or a damaged fuel system. Diagnose starting and running problems first. Tell us the year, exhaust and engine modifications when ordering calibration.
Exhaust & Intake
Choose the right airbox and exhaust combination
Air-filter shape and exhaust routing change by generation. Compare complete systems and slip-ons carefully, and keep intake sealing at the center of every performance setup.
2025–2027Full exhaust system
Yoshimura RS-12 Stainless Exhaust
A full stainless system for riders choosing an exhaust around the latest chassis, with a hydroformed muffler and header resonator.
- Full system with stainless muffler
- Match calibration and sound requirements to your race setup
2025–2027Sound-conscious exhaust
FMF Q4 Slip-On
Consider the Q4 when lower sound output and a spark-arrestor-equipped muffler are priorities for your riding location.
- Includes the listed stainless spark-arrestor screen
- Confirm header compatibility and local event requirements; sound depends on setup and maintenance
2025–2027Current airbox
Twin Air Pre-Oiled Filter
Keep a correctly prepared spare ready for the latest airbox. The bonded foam layers arrive pre-oiled for installation.
- For the 2025-generation airbox
- Check the cage and sealing surface each time the filter is changed
2004–2009Carbureted airbox
Twin Air Filter: 2004–2009
Use the filter made for the early airbox when restoring intake protection on a carbureted CRF250R.
- Dual-stage bonded foam construction
- Apply suitable foam-filter oil before use and check the perimeter seal
Sound and service matter: Keep the air filter correctly oiled and sealed, service the muffler packing as specified and check the requirements of your riding location. An exhaust change does not turn a motocross bike into a road-equipped motorcycle.
Sprockets & Final Drive
Three front-sprocket applications worth getting right
Use the exact countershaft application before choosing teeth. The examples below separate 2004–2017, 2018–2021 and 2022–2027 front sprockets, alongside a broadly shared rear-sprocket option.
2004–2017Early front sprocket
JT Front Sprocket: 2004–2017
Replace a worn countershaft sprocket or choose a gearing change using the part family for the earlier CRF250R.
- Select the required tooth count
- Keep this application separate from the 2018 and 2022 designs
2018–2021DOHC-era front sprocket
Renthal Front Sprocket: 2018–2021
Use the 2018–2021 countershaft application when choosing gearing for the first DOHC-generation CRF250R.
- Nickel-chromoly construction with mud-clearing grooves
- Select tooth count and inspect the chain and rear sprocket together
2022–2027Later front sprocket
JT Front Sprocket: 2022–2027
Choose the later countershaft application for a stock-gearing refresh or a deliberate final-drive change.
- Current stock reference: 13 teeth
- Select the tooth count on the product page; verify clearance and adjustment
2004–2027Rear gearing choices
Renthal Aluminum Rear Sprocket
Pick the rear tooth count around the track and the front sprocket already on the bike. More rear teeth shorten the gearing.
- Red anodized aluminum
- Current stock reference: 50 teeth; a gearing change can require a different chain length
Think of the drivetrain as a set: Inspect the chain, both sprockets, slider and guide together. The current 13/50 and 114-link stock reference is a starting point for a standard current bike; different gearing, axle position or an older year can change the required chain length.
Maintenance & Engine Service
Keep routine service simple—and rebuild with the right parts
Buy service supplies for the actual engine generation. When valve condition or wear calls for more than maintenance, distinguish a complete assembled head from a service performed on the head you send us.
2018–2027Oil-change supplies
Motorex Engine Oil Change Kit
Keep the 10W-30 oil, filter and crush gasket together for routine service on a compatible later CRF250R.
- Kit includes oil, filter and crush gasket
- Use the exact-year fill and level-check procedure, even when buying a packaged kit
2004–2027Oil filtration
HiFlo HF116 Oil Filter
A replacement engine-oil filter for routine CRF250R service when you already have the correct oil and sealing hardware.
- Oil filter only
- Follow Honda’s filter orientation and cover-installation procedure
2004–2007Early engine rebuild
OEM Head with Kibblewhite Valves
An assembled OEM-based head with Kibblewhite stainless valves and springs, CNC valve-seat work and port-to-seat profiling for an early CRF250R rebuild.
- Fits 2004–2007 CRF250R
- Built to order; review the non-cancellation and return terms plus optional gasket and studs
2022–2027Send-in head service
CNC Valve Job with Titanium Valves
Refresh your existing head with inspection, CNC valve-seat work and Kibblewhite titanium valves when the top end needs professional service.
- Send-in service; a new cylinder head is not included.
- Seat or guide replacement and optional work may add cost
Plan the job before ordering: Confirm which gaskets, seals and hardware you need, and review the conditions for custom work. A new cylinder head does not replace inspection of the piston, timing components and rest of the engine.
Build Your Setup
Four focused CRF250R build plans
Pick the starting point that matches your bike and riding. Each plan sets priorities; add parts when they solve a specific need.
Build 01
Used-Bike Reset
- Confirm year, engine and suspension configuration
- Inspect intake sealing, valves and service records
- Refresh fluids, filters and worn drivetrain parts
- Establish an hour log before performance work
Build 02
Carbureted Revival
- For 2004–2009: diagnose starting and valve condition
- Inspect the FCR carburetor, seals and accelerator pump
- Match jetting to engine, exhaust and riding conditions
- Restore controls, suspension and chassis bearings
Build 03
Better Track Control
- Set race sag and record fork/shock settings
- Match spring support or air-fork setup to your year
- Restore grip, lever position and brake feel
- Evaluate gearing after the chassis works consistently
Build 04
2025–2027 Race Setup
- Build from the latest chassis application
- Establish a fresh filter and service routine
- Choose exhaust and ECU calibration together
- Check gearing, sound requirements and race-class rules
Keep It Ready to Ride
CRF250R maintenance and used-bike checks
Start a service log with engine hours and dates. A clean-looking used bike can still need valves, piston work, bearings or suspension service. On a phone, swipe across the table to see all columns.
Ask for a cold startLook for starting trouble, smoke, leaks and abnormal noise.
Inspect the intakeLook for dirt past the filter and damage to the sealing surfaces.
Review the recordsAsk about hours, valves, piston, oil and suspension service.
Check what changedIdentify aftermarket ECU maps, engine parts, wheels and fork swaps.
| Service priority | When to address it | What matters |
|---|---|---|
| Before every ride | Pre-ride inspection | Check fuel, oil level, coolant, air filter sealing, throttle return, brakes, chain, tires, spokes and loose hardware. |
| Air filter and intake | Inspect before riding; service more often in dust and sand | Use the correct filter and cage, clean and oil the foam correctly, and confirm the sealing surface is seated all the way around. |
| Current-model race schedule | 2026–2027 standard CRF250R | The timed rows below summarize Honda’s competition schedule. Use the exact-year schedule for an older motorcycle. |
| Each race / about 2.5 hours | Clean and inspect | Clean the air filter; inspect the plug, oil level, cooling, throttle, clutch, brakes, drivetrain, wheels and chassis. Clean the air filter after every moto in dust. |
| Every 3 races / about 7.5 hours | Chain and linkage | Replace the drive chain and lubricate swingarm/shock linkage as scheduled. |
| Every 6 races / about 15 hours | Engine service | Inspect valves/decompressor; replace oil, oil filter, piston, rings and piston pin as scheduled. |
| Every 9 races / about 22.5 hours | Suspension service | Replace fork oil and inspect steering-head bearings. |
| Every 12 races / about 30 hours | Fuel-system service | Replace the fuel line and fuel-pump filter; Honda also specifies annual replacement. |
| Oil system | Use the exact-year manual and competition schedule | Older Unicam bikes have separate engine and transmission oil service. Do not use a current-model fill quantity on an earlier engine. |
| Hard starting or lost performance | Diagnose before buying performance parts | Check valve clearance, compression/leak-down, fresh fuel and intake sealing. Carbureted bikes also need hot-start and accelerator-pump checks; EFI bikes need fault and electrical checks. |
| Fork and shock | Record settings; follow the year-specific service plan | Identify the installed fork. Air-pressure setup for a 2015–2017 SFF-TAC fork does not transfer to a coil-spring fork. Service wear before changing settings. |
| Gearing and chain | Inspect and lubricate regularly; recheck after changes | Look for hooked teeth, tight spots, slider wear, damaged guides and alignment problems. Check chain length and slack with the installed sprocket combination. |
| Brakes, bearings and wheels | Pre-ride checks and scheduled inspection | Check pad and rotor wear, consistent lever feel, spokes, wheel bearings, steering and linkage movement. |
| Unknown race history | Establish a baseline before extending service intervals | Ask for piston, valve and suspension records. An hour meter fitted recently does not establish total engine hours. |
These are competition-service references, not a substitute for the complete 2027 Honda Competition Handbook (maintenance table 2-10). Honda also calls for oil, oil-filter and fork-oil replacement plus valve inspection after the first break-in ride. Use the 2026 handbook for that year. Shorten service intervals for severe use; follow the full inspection, torque and level-check procedures.
Common Questions
Honda CRF250R FAQ
Model changes, fitment, stock specifications and practical upgrade decisions.
What years does this CRF250R guide cover?
This guide covers U.S.-market Honda CRF250R models from 2004 through 2027. CRF’s Only has confirmed 2026-to-2027 carryover. Use each product’s exact application range when ordering.
Is the 2027 CRF250R a carryover for parts?
CRF’s Only has confirmed carryover from 2026 to 2027 for the CRF250R. This extends the relevant 2026 parts application; it does not make older generations, the CRF250RX or the CRF250RWE interchangeable with every current part.
When did the CRF250R get fuel injection?
The CRF250R changed from a carburetor to fuel injection for 2010. The 2004–2009 bikes use carburetor jetting and service parts; 2010-and-later bikes require year-specific EFI components and calibration.
When did the CRF250R get electric start and a DOHC engine?
Both arrived with the 2018 redesign. The earlier CRF250R uses a Unicam engine and kickstarter. Confirm the exact engine and electronics application before ordering ignition, ECU or internal engine parts.
Is the CRF250R the same as a CRF250F or CRF250RX?
No. The CRF250F is an air-cooled trail bike. The CRF250RX is a cross-country model with its own setup and equipment. The CRF250R is the motocross model. Shared parts must explicitly list the relevant model and year.
Does this guide cover the CRF250RWE or HRC Works Edition?
The guide focuses on the standard CRF250R. The Works Edition has different equipment, including some model-specific clutch, tire and chain specifications. Choose parts that explicitly list your RWE or HRC Works Edition model and year.
What are the stock CRF250R tire sizes?
The standard U.S. 2026–2027 CRF250R uses an 80/100-21 front and 100/90-19 rear. Check your year and the rim and tire currently installed, especially on a used bike or one with a wheel conversion.
What are the stock sprockets and chain?
For the standard 2026–2027 CRF250R, Honda lists 13 teeth front, 50 rear and a #520 chain with 114 links. Earlier ratios can differ. A change in tooth count can also change the chain length and adjustment range you need.
Which spark plug does the CRF250R use?
The standard 2026–2027 reference is NGK SILMAR9A-9S, with a non-adjustable 0.8–0.9mm gap. Earlier models can use different plugs and gaps. Check the Honda manual for your year before substituting a plug.
How much oil does the CRF250R take?
The standard 2026–2027 reference is 1.08L / 1.14 US qt with a filter change, or 1.05L / 1.11 US qt after draining only. Use Honda’s level-check procedure. Older engines can have separate engine and transmission fills and different capacities.
What should I upgrade first?
First address worn or overdue service parts. Then set race sag, suspension balance and control positions. Choose protection, tires, gearing or power-delivery changes based on what is actually limiting the bike at your track.
Why do some CRF250R parts have much shorter year ranges?
Honda changed engine architecture, frames, bodywork, intake systems, exhausts and suspension at different times. A chain or oil filter may span many years while an ECU, skid plate or exhaust fits only a smaller group. The part’s specific application matters more than the broad generation label.
Can I put fork springs in every CRF250R fork?
No. Identify the fork fitted to the motorcycle first. The stock 2015–2017 Showa SFF-TAC system uses air-spring adjustment and differs from coil-spring forks. An older bike may also have a fork conversion or swap.
Do I need an ECU when I change the exhaust?
Check the requirements of the exhaust and ECU for your exact year and engine configuration. Some combinations call for matched calibration. Do not assume a map for another year, muffler or engine build will suit your motorcycle. Carbureted 2004–2009 models need jetting considerations instead.
Will a bigger rear sprocket help?
With the front sprocket unchanged, more rear teeth shorten the overall gearing. This can help the bike pull a particular corner or section, while increasing engine rpm at a given speed. Check chain length, guide clearance and adjustment range before ordering.
What should I check before buying a used CRF250R?
Confirm the VIN and model year, request a cold start and review engine-hour and service records. Inspect the airbox for dirt past the filter, check coolant and oil condition, and look at the frame, wheels, linkage, brakes and suspension. Allow for professional engine diagnosis if starting, noise or service history raises questions.
Build Your CRF250R
Find your year. Fix the weak point. Get back on the track.
Explore the full CRF250R parts selection or ask us to help match the right components to your model year and current setup.