2018 Honda CRF125F Review of Specs & Features (includes CRF125FB Big Wheel)

OEM Honda Powersports Parts Discount Code - Motorcycles, ATV, SxS, UTV, Scooters, Side by Side

– Detailed 2018 CRF125 Dirt Bike Buyer’s Guide: Price, Seat Height, Weight, HP & TQ Performance + More! –

2018 Honda CRF125F VS CRF125F Big Wheels Review of Specs & Differences - Dirt / Trail Bike - Off Road Motorcycle

The perfect first dirtbike, featuring a low-maintenance air-cooled engine with strong bottom-end torque, manual four-speed gearbox and clutch, a super-tough chassis and CRF450R-inspired bodywork. Just a few years ago the CRF110F replaced the immensely popular and iconic CRF70F (previously known as XR70) within Honda’s family of fun, entry-level CRF off-road bikes. Next up for the CRF model lineup as far as changes go were the two new larger-displacement CRF125F models, allowing consumers more choices in this market segment. The two CRF125F models offer unique wheel sizes that allow them to replace the CRF80F and CRF100F. With a seat height of 28.9 inches, the small-wheel CRF125F seat is the same height as the CRF80F it replaces, while the CRF125F Big Wheel features the same seat height—30.9 inches—as the CRF100F it replaces. This seat-height option allows riders to pick the CRF125F that fits best. Featuring an all-new electric-start 125cc single-cylinder OHC four-stroke engine tuned for loads of low-end grunt plus plenty of pull throughout the powerband, the CRF125Fs also feature a four-speed gearbox. Add a new rolling chassis with upgraded suspension components front and rear plus styling just like Honda’s CRF® motocross bikes, and you have a great addition to Honda’s off-road line of family machines with a bike for all riders—young to old, beginner to expert.

Not only is the engine the next step up from our CRF110F, the chassis, seat height, and wheels are too. It hits that sweet spot that makes it a great choice for both young riders and smaller adults. Loaded with features designed to make trail riding a fun, no-hassle experience, it’s also pure Honda when it comes to reliability and durability, thanks in part to its rugged, air-cooled design. An electric starter makes it easy to get going, while a four-speed transmission gives you all the control of a full-sized bike.

2018 CRF125F Prices:

  • 2018 CRF125F Price / MSRP – $2,999
  • 2018 CRF125FB Big Wheel Price / MSRP – $3,399

2018 CRF125F Model ID:

  • 2018 CRF125F = CRF125FJ
  • 2018 CRF125F Big Wheel = CRF125FBJ

CRF125F / CRF125F Big Wheel Review Contents:

  • 1 Introduction
  • 2 Model overview
  • 3 Key features
  • 4 Technical specifications

1. CRF125F Introduction

Riding off-road on trails, motocross tracks and back yards is an activity that often involves the whole family. For children it’s a perfect introduction to motorcycling that quickly builds skills and machine control, so useful in adult life whether in competition or out on the open road. For Honda, attracting young riders early in their career is a great introduction to the brand and its engineering values.

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Honda’s CRF range spans recreational and competition off-road machines and is steadily becoming a brand within a brand. The CRF50F and 110F get youngsters riding early, having fun and learning, while the CRF250L add road-going dual-purpose and Supermoto attitude respectively. For Enduro use, the CRF250X and 450X are the ideal tools for the job. And the awesome CRF250R and CRF450R – with state-of-the-art engines, frames and suspension – stand at the pinnacle of Honda motocross racing technology and inspire every other CRF in turn. Honda’s return to the Dakar rally with a works team for the first time since 1989, with the CRF450 Rally, further underlines the importance of off-road racing to the company.

2. CRF125F / CRF125F Big Wheel Model Overview

Replacing the CRF100F, the CRF125F – and big-wheel CRF125FB – not only features a larger capacity; its air-cooled four-speed engine has been tuned specifically to give plenty of novice-friendly bottom-end torque. The addition of electric start also makes life easier for the young rider.

A brand new frame, uprated suspension and brakes manage the improved performance and deliver confident handling and stopping. And the CRF450R’s cutting edge design provides styling cues for the CRF125F’s bodywork.

In essence the CRF125F is built to be everything the young entry-level rider could possibly hope for as they continue their off-road journey. It’s tough, reassuring, easy to look after and a whole lot of fun. Which is actually what the final “F” in every CRF-F model stands for – Fun.

YUICHI KATO, Overall Development Leader Off-Road/ATV Category:

The new CRF125F keeps the easy-to-handle body size of its predecessors but features a new, improved engine. It also has a new look, fuller functionality and many other features, all at an affordable price. I hope the CRF125F will encourage even more people to try their hand at, and enjoy, both riding and competing off-road.”

The key phrase used to head CRF125F development:

“Your first real dirtbike.”


  • The 124.9cc SOHC engine is tuned for strong bottom-end torque that builds in a linear fashion through the midrange up to the top end.
  • The four-speed gearbox is well matched to the broad power spread.
  • Electric starter makes getting going a breeze.


  • The CRF125F has a seat height of 28.9 inches, while the CRF125F Big Wheel has a 30.9-inch seat height.
  • 31mm fork provides plush front suspension action.
  • Pro-Link® single-shock rear suspension features a sophisticated shock for consistent action.
  • Hydraulic front disc brake with 220mm rotor and 95mm rear drum brake provide strong stopping power.
  • Front brake lever is adjustable to suit the rider’s hand size.
  • Styling follows that of the race-winning CRF250R and CRF450R.

3. CRF125F Key Features

3.1 Chassis

A brand new steel diamond backbone frame gives the CRF125F chassis the perfect balance of rigidity and strength ensuring a stable and engaging ride. The integrated air box/battery design – fitted lengthwise in the frame – keeps the bike slim and a seat height of 28.9 inches (30.9 inches for the CRF125FB; figures stated in brackets where different) makes it very manageable for most youngsters aged 10 and above. Wheelbase is 48 inches (49.4 inches on Big Wheel) with rake and trail of 27°/81mm (27°/94mm). Curb weight comes in at 192 lbs.

Beefed-up 31mm telescopic forks – the CRF100F used 27mm – feature heavier weight springs and 140mm stroke (150mm). The new rear shock uses a 32mm diameter piston damper and separate air/oil/gas pressurization chambers to reduce emulsification. It has a 114m stroke (150mm). The high suspension quality means bump absorption, ride quality and tracking are much improved. A steel swingarm works through Honda’s Pro-Link system, and needle bearings have been used throughout to reduce friction.

For stability and traction front wheel size is 17-inch, matched by a 14-inch rear. For a bigger bike feel and improved stability the CRF125FB uses a 19-inch front and 16-inch rear. A 220mm front hydraulic disc brake – with adjustable span lever – deals out consistent and easy to modulate stopping power. It’s complemented by the 95mm drum rear.

New contact points – wide-set footpegs and brake pedal – match narrower handlebars and give great control. The grips employ the same ‘half-waffle’ rubber as used on the CFR450R: the waffle ridges give improved fingertip sensitivity and subtler throttle feel. A redesigned kickstart lever hinges at the bottom for better leverage.

The CRF450R’s ‘triangle proportion’ bodywork transfers readily to the CRF125F and the same benefits – complete freedom and ability of the rider to move around – are evident. Fuel capacity is 1.1 gallons and ignition is secured by key. The Extreme Red and Ross White graphic treatment provides the finishing CRF signature.

3.2 Engine

Robust and low maintenance the 124cm3 air-cooled SOHC engine powering the CRF125F delivers strong and linear bottom-end torque – a significant step forward compared to the CRF100F. The focus of Honda’s engineers was around speeding up gas flow velocity, and reduced valve overlap and lift generate performance gains at low-rpm and low-speed. Bore and stroke is set at 52.4 x 57.9mm. Peak horsepower of 8.9 HP arrives at 7,000rpm, peak torque of 7.52 lb/ft @ 4,500rpm.

Fed by carburetor, a new airbox design – located lengthwise – saves weight, increases airflow and also locates the compact battery needed for the electric starter. The air filter uses the same type of element as the CRF450R for a greater surface area and increased air intake volume. Powerful, zero-fuss CDI ignition also boosts performance, as does the new exhaust. The drive sprocket cover is no longer integrated with the ACG cover for improved accessibility when replacing the front sprocket. The four-speed manual gearbox and clutch – a key part of the first real dirtbike philosophy – are smooth changing and easy to use.

4. CRF125F Technical Specifications

2018 CRF125F / CRF125FB Specifications
Model: CRF125F / CRF125FB
Engine Type: 124.9cc air-cooled single-cylinder four-stroke
Bore and Stroke: 52.4mm x 57.9mm
Compression ratio: 9.0:1
Valve Train: SOHC; two-valve
Induction: 20mm piston-valve carburetor
Ignition: DC-CDI
Transmission: Four-speed
Final Drive: 13T/46T (CRF125F) / 13T/49T (CRF125FB)
Suspension Front: 31mm leading-axle fork; 5.5 inches travel (CRF125F) / 5.9 inches travel (CRF125FB)
Rear: Pro-Link single shock; 4.5 inches travel (CRF125F) / 5.9 inches travel (CRF125FB)
Brakes Front: 220mm hydraulic disc
Rear: Drum
Tires Front: 70/100-17 (CRF125F) / 70/100-19 (CRF125FB)
Rear: 90/100-14 (CRF125F) / 90/100-16 (CRF125FB)
Wheelbase: 48.0 inches (CRF125F) / 49.4 inches (CRF125FB)
Rake (Caster Angle): 25°30′ (CRF125F) / 27°30′ (CRF125FB)
Trail: 81mm (3.2 inches) (CRF125F) / 94mm (3.7 inches) (CRF125FB)
Seat Height: 28.9 inches (CRF125F) / 30.9 inches (CRF125FB)
Ground Clearance: 8.5 inches (CRF125F) / 10.4 inches (CRF125FB)
Fuel Capacity: 1.1 gallons, including 0.2-gallon reserve
Color: Red
Curb Weight*: 192 pounds (CRF125F) / 194 pounds (CRF125FB)

* Includes all standard equipment, required fluids and full tank of fuel—ready to ride. Meets current CARB and EPA off-road emissions standards.

Weight Capacity: Specification
50 State, meets CA: 220 lbs (100 kg)
Publication Order Numbers: Specification
Service Manual: 61K2802
Owner’s Manual: 31K28B20
Engine: Specification, Units: mm (in)
Cylinder arrangement: Single cylinder inclined 25° from vertical
Bore and stroke: 52.4 x 57.9 mm (2.06 x 2.28 in)
Displacement: 125 cm³ (7.6 cu-in)
Cylinder compression at rpm: 1,393 kPa (14.2 kgf/cm2, 202 psi) at 600 rpm
Standard: 0.010 – 0.035 mm (0.0004 – 0.0014 in)
Service Limit: 0.10 mm (0.004 in)
Intake: 0.10 ± 0.02 (0.004 ± 0.001)
Exhaust: 0.15 ± 0.02 (0.006 ± 0.001)
Recommended engine oil/classification/viscosity: Pro Honda GN4 4-stroke oil/API: SG or higher, JASO T 903 standard: MA/SAE 1
Oil capacity after draining/engine oil filter change: 0.9 liter (1.0 US qt, 0.8 lmp qt)
Final Drive: Specification
C/S sprocket: 13
Rear sprocket: 46
Drive chain size (x) links: 428 x 112
Drive chain slack: 14.0 mm (0.55 in)
Fuel System: Specification
Type/throttle bore: 20 mm (0.8 in)
Carburtetor/throttle body ID #: PDB4B
Float level: 14.0 mm (0.55 in)
Main jet: #112
Slow jet: #38
Pilot screw initial opening: 1 -5/8
Idle speed (+/- 100 rpm): 1,400 ± 100 rpm
Throttle grip/lever free play: 3.0 – 6.0 mm (0.12 – 0.24 in)
Suspension: Specification
Recommended fork fluid: Pro Honda suspension Fluid SS-8 (10W)
Fork fluid capacity/and level: 187 (7.4)
Tires: Specification
Front  Size: 70/100 – 17M/C 40M
Cold tire pressure: 100 kPa (1.00 kgf/cm², 15 psi)
Rear  Size: 90/100 – 14M/C 49M
Cold tire pressure: 100 kPa (1.00 kgf/cm², 15 psi)
Battery/Charging System: Specification
Charging system type: Single phase output alternator
BatteryCapacity/Model: 12 V – 3 Ah/YTX4L-BS
Fully charged: 13.0 – 13.2 V
Needs charging: Below 12.4 V
Normal: 0.4 A/5 – 10 h
Quick: 4.0 A/0.5 h
Regulated voltage at rpm: Measured BV < Measured CV < 15.5 V at 5000 rpm
Alternator charging coil resistance: 0.7 – 1.5 O
Ignition System: Specification
Ignition system type: CDI (Capacitive Discharged Ignition)
Ignition timing (F mark): 10° BTDC at idle
Standard – NGK: CPR6EA-9
Spark plug gap: 0.80 – 0.90 mm (0.031 – 0.035 in)
Ignition coil peak voltage: 100 V minimum
Ignition pulse generator peak voltage: 1.0 V minimum
Alternator exciter coil peak voltage: N/A
Torque value: Specification, Unit: N.m (kgf.m, lbf.ft)
Front axle bolt/nut: 62 (6.3, 46)
Rear axle nut: 62 (6.3, 46)
Crankcase: 24 (2.4, 18)
Cylinder head cover bolt: 10 (1.0, 7)
OEM Honda Powersports Parts Discount Code - Motorcycles, ATV, SxS, UTV, Scooters, Side by Side