Best first upgradeProtection
Flatland Racing Aluminum Skid Plate
Model-specific 3/16-inch aluminum protection for the engine underside, crankcase and vulnerable side coverage.
- TIG-welded, bolt-on construction
- Oversized oil-drain access
2026–2027 Honda Trail Bike
Honda CRF300F Rider Guide
Stock specs, setup priorities, maintenance guidance and carefully selected CRF300F upgrades for Honda's newest full-size recreational trail platform.
All Honda CRF Rider GuidesKnow Your Bike
More trail-bike engine, one more gear—and a new parts platform.
Introduced for 2026, the CRF300F succeeds the CRF250F as Honda's full-size recreational trail bike. It combines an air-cooled, counterbalanced single with fuel injection, electric starting, an oil cooler and a six-speed transmission.
Honda's 2026 and 2027 published mechanical specifications are the same, and CRF's Only has confirmed the platform's 2026–2027 fitment. The engine measures 293cc by bore and stroke; Honda also rounds it to 294cc in some marketing material.
CRF300F is not CRF300L—and CRF250F parts are not automatic carryovers
This guide is for the USA-spec CRF300F off-road trail bike. The street-legal, liquid-cooled CRF300L and CRF300L Rally are different motorcycles. The CRF250F shares the trail-bike mission and some familiar dimensions, but the new engine, six-speed drivetrain, bodywork and chassis changes mean fitment must be confirmed one product at a time.
Start Here
Three smart first priorities
Start with rider fit and real trail needs. The newest accessory is not automatically the most useful one.
-
01
Protect the new motorcycle
Shield the lower engine and cases before rocks, logs and ledges make the first upgrade decision for you.
Start With Protection -
02
Set the chassis for the rider
Check sag, spring support and control position before chasing power. A balanced bike is easier to place and less tiring to ride.
Compare Suspension Options -
03
Build a service routine
Learn the air-filter, oil-and-filter, chain and valve schedule early so the trail bike stays ready between rides.
Review Maintenance
Quick Reference
Honda CRF300F stock specs
Honda publishes the same core engine, drivetrain, tire and chassis specifications for the 2026 and 2027 CRF300F. Follow the manual supplied with your motorcycle whenever a procedure, capacity or torque value matters.
- Front tire
- 80/100-21
- 51R NHS, tube-type bias-ply
- Rear tire
- 100/100-18
- 59R NHS, tube-type bias-ply
- Front sprocket
- 14 tooth
- Stock reference gearing
- Rear sprocket
- 50 tooth
- Stock reference gearing
- Drive chain
- #520 O-ring
- Honda specifies DID 520VD2; verify length before cutting
- Spark plug
- NGK SILMAR7D9DS
- Gap 0.8–0.9 mm (0.03–0.04 in)
- Engine
- 293cc
- Honda also markets it as a 294cc-class engine
- Fuel system
- PGM-FI
- 34mm throttle body
- Transmission
- 6-speed
- Manual clutch
- Engine oil
- 1.6 US qt
- After draining; 1.7 qt with filter; SAE 10W-30
- Fuel capacity
- 1.6 US gal
- Includes 0.34-gallon reserve
- Brakes
- 240 / 220 mm
- Front / rear petal discs
Useful numbers: Honda specifies 15 psi cold in both stock tires, 30–40 mm (1 3/16–1 9/16 in) of drive-chain slack and a maximum load of 220 lb including rider and accessories. Honda does not publish a stock chain-link count, so confirm the installed gearing, axle position and required length before cutting a replacement chain.
Choose Your Goal
CRF300F upgrade guide
These are curated starting points, not a requirement to replace everything at once. Choose the problem you want to solve, then confirm the exact model year, configuration and current product details before ordering.
Protection, Comfort & Control
Protect the cases and improve rider connection
For most trail builds, protection and rider contact points deliver value before engine work. Start underneath the bike, then address the seat and controls that affect every mile.
Longer-ride supportSeat
Seat Concepts Complete Comfort Seat
A complete seat with a wider seating area and stock-height or low configurations for riders prioritizing support and reach.
- Low option is available in black only
- Made to order; confirm current options and timing
Adjustable reachBrake lever
Zeta Pivot Brake Lever
A short three-finger lever with reach adjustment and an outward-folding pivot designed to reduce damage in a fall.
- CNC-machined and hard-anodized
- Set reach for the rider's hand position
Refresh the controlThrottle
CRF300F Throttle Housing
A die-cast aluminum housing supplied with the rubber boots, pulleys, bolts and adjusters needed for the assembly.
- Bike-specific application
- Inspect cables and routing during installation
Suspension & Rider Fit
Choose support before chasing adjustment
Spring support and damping are different decisions. Measure rider sag, note where the bike bottoms or deflects and decide whether the stock components are simply under-sprung or need a broader performance change.
Fork rides low?Evaluate front spring support.
Rear bottoms?Evaluate rear spring support.
Both ends feel unbalanced?Tune them as a system.
Want a complete rear solution?Consider a custom shock.
More front supportFork
BBR Heavy-Duty Fork Springs
Adult-rider springs developed for the stock CRF300F fork when the original support is too soft for rider weight or pace.
- Pre-set and stress-relieved
- Fits the stock fork
More rear supportShock
BBR Heavy-Duty Shock Spring
A 12.5 kg replacement spring for riders who need more rear support than BBR's listed 9.0 kg stock reference.
- BBR states approximately 30% stiffer
- Spring only; retain the stock shock
Custom rear setupShock
Race Tech G3-S Custom Shock
A replacement shock built and valved around rider weight, ability and riding style rather than a one-setting-fits-all setup.
- Custom-built product
- Review current build and order policies before purchase
Setup note: Set sag and establish chassis balance before judging a suspension change. Spring rate supports load; damping controls motion. Change one variable at a time and recheck tire pressure, steering response and ride height.
Power, Exhaust & EFI
Treat airflow and fueling as one package
The CRF300F uses a 34mm fuel-injection system, not a carburetor. Choose an exhaust for the intended use and sound requirements, keep the filter properly serviced and evaluate fueling for the complete intake-and-exhaust combination.
Complete systemExhaust
Yoshimura RS-2 Full Exhaust System
A stainless Enduro Series full system developed specifically for the CRF300F, with a USFS spark arrestor installed.
- Header and muffler system
- Not for the CRF300L or Rally
Slip-on optionExhaust
FMF PowerCore 4 Hex Slip-On
An aluminum-and-stainless slip-on with a removable spark-arrestor screen for riders choosing a muffler-only path.
- Quiet insert sold separately
- Review the PDP's closed-course notice
Serviceable airflowIntake
Uni Two-Stage Air Filter
A reusable two-stage foam filter that separates for thorough cleaning—useful for riders who maintain filters frequently in dust.
- Oil and install as directed
- Keep a clean, serviced filter ready
EFI and exhaust note: A fuel-injected bike is not permission to ignore fueling. The correct approach depends on the complete intake and exhaust combination, riding conditions and intended use. Review sound, spark-arrestor, emissions and closed-course restrictions before ordering, and do not stack two alternative exhaust systems into one build.
Drivetrain, Tires & Brakes
Start from the stock 14/50 gearing
The stock reference is a 14T front, 50T rear and #520 O-ring chain. Count the installed sprockets and confirm the required chain length before changing gearing; then match tire construction and brake setup to the terrain.
Gearing choiceFront sprocket
Renthal Front Sprocket
A nickel-chromoly countershaft sprocket with selectable tooth counts for replacement or a deliberate gearing change.
- Stock reference is 14T
- Confirm chain length and clearance after a size change
Stall controlClutch
Rekluse RadiusX Auto Clutch
A drop-in auto-clutch pack designed to prevent stalling while retaining normal clutch-lever override when the rider wants it.
- Explicitly listed for CRF300F 2026–2027
- Useful in stop-start and technical terrain
Adjustable positionRear brake
Hammerhead Forged Brake Pedal
A forged 6061-aluminum pedal with a machined tip that can be mounted in two length positions for boot placement.
- Replaceable brake tip
- Set free play and verify full brake release
Tire note: The stock sizes are 80/100-21 front and 100/100-18 rear, both tube-type. Size is only the beginning—choose tread, compound and carcass for the terrain, and verify the tire maker's pressure, rim and installation guidance.
Service Parts & Information
Keep the new platform on a known schedule
The CRF300F uses a replaceable cartridge oil filter, a serviceable foam air filter and a sealed drive chain. Build your routine around conditions and operating time, not only the odometer.
Oil serviceFilter
K&N KN-113 Oil Filter
A replacement cartridge filter with pleated media for routine CRF300F oil-and-filter service.
- Use a new sealing O-ring as required
- Honda specifies 1.7 US qt with filter change
Starting systemBattery
Firepower Sealed Battery
A pre-filled AGM replacement battery with a sealed, maintenance-free design for the electric-start CRF300F.
- Freshening charge recommended before installation
- Follow battery safety and charging instructions
Factory referenceManual
Honda 2026 CRF300F Owner's Manual
Honda's official reference for safety, controls, specifications, maintenance intervals and owner-level service procedures.
- Service data used in this guide
- Always prioritize the manual supplied with your bike
Browse All CRF300F Parts
The full selection includes additional protection, controls, suspension, drivetrain, performance and replacement products.
Build Your Setup
Four sensible CRF300F build paths
Use these as priorities, not mandatory packages. Account for rider size, terrain, pace and local equipment rules before buying parts.
Build 01
New-Bike Trail Baseline
- Flatland skid plate
- Set lever, pedal and handlebar position
- Confirm tire pressure and chain slack
- Start the service log at break-in
Build 02
Adult Rider Suspension
- Measure rider sag
- Evaluate fork spring support
- Match rear spring support
- Consider a custom shock when damping is also the goal
Build 03
Technical Trail Control
- Set lever reach and brake-pedal position
- Choose gearing for the terrain
- Consider the Rekluse for stall-prone riding
- Keep controls and drivetrain properly adjusted
Build 04
Performance Trail
- Complete protection and chassis setup first
- Choose one exhaust path
- Service or upgrade the air filter
- Evaluate fueling for the complete combination
Owner's Manual Baseline
CRF300F maintenance quick guide
Honda's schedule is a baseline for normal use. Service more often after dust, sand, mud, deep water or hard riding, and follow the manual supplied with your motorcycle for final procedures and specifications.
| Item | Useful baseline | What to verify |
|---|---|---|
| Break-in | First riding day or 15 mi / 25 km | Avoid full-throttle starts and rapid acceleration |
| Initial service | 100 mi / 150 km or 1 month | Oil, filter, valves and the complete schedule in the owner's manual |
| Engine oil & filter | Initial service; then every 600 mi / 1,000 km or 6 months | SAE 10W-30, API SJ+, JASO MA; 1.7 US qt with filter |
| Air cleaner | Clean every 600 mi / 6 months | Service more frequently in wet or dusty conditions |
| Drive chain | Inspect, adjust and lubricate every 300 mi / 3 months | 30–40 mm slack; clean and lubricate sooner after severe conditions |
| Spark plug | Inspect every 600 mi / 6 months | NGK SILMAR7D9DS; 0.8–0.9 mm gap |
| Valve clearance | Initial service; then every 600 mi / 6 months | Cold: intake 0.12 ± 0.03 mm; exhaust 0.20 ± 0.03 mm |
| Spark arrester | Every 1,000 mi / 1,600 km or 100 operating hours | Allow the exhaust to cool and follow Honda's procedure |
| Brake fluid | Inspect on schedule; replace every 2 years | Fresh DOT 4; Honda recommends dealer replacement |
This condensed checklist uses Honda's 2026 USA owner's manual. Honda publishes the same core engine, drivetrain and chassis specifications for 2027, but a separate 2027 manual was not yet available in Honda's online archive when this guide was prepared. Always follow the manual supplied with your motorcycle.
Common Questions
Honda CRF300F FAQ
Quick answers for model identification, stock specifications, service and common upgrade decisions.
What years does this CRF300F guide cover?
This guide covers the 2026 and 2027 Honda CRF300F. Honda's published mechanical specifications are the same for both years, and CRF's Only has confirmed the 2026-to-2027 product-fitment carryover. Still review the individual product configuration before ordering.
Is the CRF300F the same as the CRF300L or CRF300L Rally?
No. The CRF300F is an off-road recreational trail bike with an air-cooled engine. The CRF300L and Rally are street-legal, liquid-cooled dual-sport models built around a different engine and chassis. Do not order a 300L part for the 300F unless the product page explicitly lists both motorcycles.
Do CRF250F parts fit the CRF300F?
Do not assume they do. The CRF300F succeeds the CRF250F and has familiar trail-bike proportions, but it adds a larger engine, six-speed transmission, oil cooler and associated chassis, bodywork and exhaust changes. Use only parts whose manufacturer application specifically includes the CRF300F.
Is the CRF300F street legal?
No. The USA-spec CRF300F is designed and sold for off-road use. Registration and equipment rules vary by location, so check the applicable laws rather than assuming lights or other accessories make it road legal.
Is the CRF300F fuel injected?
Yes. It uses Honda PGM-FI with a 34mm throttle body. That improves starting and altitude compensation compared with a carburetor, but intake and exhaust changes can still alter the fueling needs of the complete setup.
Is the CRF300F 293cc or 294cc?
The published 77.0 × 63.0mm bore and stroke calculate to approximately 293cc, and Honda's 2027 specification page uses 293cc. Some 2026 Honda marketing rounds the engine to 294cc. Those two labels describe the same platform, not two different engines.
What tire sizes fit the CRF300F?
The stock front size is 80/100-21 51R NHS and the rear is 100/100-18 59R NHS. Both are tube-type, bias-ply off-road tires. Honda specifies 15 psi cold front and rear for the stock setup; follow the tire maker and owner manual when changing tire construction or use.
What chain and sprocket sizes are stock?
The stock reference is a 14T front sprocket, 50T rear sprocket and #520 O-ring-sealed chain. Honda specifies DID 520VD2 as the replacement-chain type but does not publish a link count. Confirm installed gearing, axle position and needed length before cutting a chain.
What spark plug does the CRF300F use?
Honda specifies the NGK SILMAR7D9DS with a gap of 0.8–0.9 mm (0.03–0.04 in). Use the exact plug specification and follow the owner's manual for removal, inspection and installation.
What oil and capacity does the CRF300F use?
Honda specifies SAE 10W-30 motorcycle oil meeting API SJ or higher—excluding energy/resource-conserving oils—and JASO MA. Capacity is 1.6 US qt after draining, 1.7 US qt with the filter changed and 2.1 US qt after disassembly. Verify the oil level by Honda's procedure rather than relying on quantity alone.
What should I do during CRF300F break-in?
For the first operating day or 15 miles, Honda advises avoiding full-throttle starts and rapid acceleration. The initial service is due at approximately 100 miles or one month; check the complete schedule and procedures in the owner's manual.
What CRF300F upgrade should I do first?
For rocky trail use, a skid plate is an easy first choice. For an adult or faster rider, measure sag and evaluate spring support. If hand reach, seat comfort or stalling is the actual limitation, address that directly. Performance parts make more sense after protection, rider fit and maintenance are handled.
Does a CRF300F exhaust require fuel tuning?
The answer depends on the full intake and exhaust combination, conditions and how the bike runs. Do not assume fuel injection compensates for every airflow change. Follow the exhaust and fueling manufacturers' guidance, check legal-use restrictions and evaluate the complete package rather than one part in isolation.
How fast does a CRF300F go?
Honda does not publish a universal top-speed figure. Rider weight, elevation, terrain, tire choice, gearing, break-in and test method all change the result. For a trail bike, controllable low-speed response, chassis setup and usable gearing are more meaningful than an unsupported top-speed claim.
Ready to Build Your CRF300F?
Start with fitment, rider setup and the part that solves the real problem.
Shop the complete 2026–2027 CRF300F selection or ask us to help confirm the right product and configuration before you order.