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4T YX Engine - 125cc (Classic Start)

Ref: YX125GN See the description
299.99€ 50.00€
249.99€
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Ignition (option)
Carburetor (optional)

In stock

Only 7 parts in stock

Must-haves

Why you're going to love it!  

  • Official Distributor of YX© engines
  • 4-Speed Manual Gearbox (N1234)
  • Ideal for beginners and progressive power!
  • Number of HP: 9hp

125cc YX Engine Classic Start for Dirt Bike, Pit Bike

The 125cc YX engine is built to withstand the rigors of off-road competition. Its durability is essential to ensure consistent performance during long racing sessions and intensive training.

Easy maintenance: Another advantage of this engine is its ease of maintenance. With a simple and well-thought-out design, regular maintenance is easy to perform, allowing riders to spend less time in the garage and more time on the track.

Versatility: Although this engine is mainly used in off-road racing, its versatility also allows it to adapt to other applications such as pit bikes and recreational motorcycles.

Power: 10hp

Bore: 54mm

Speed: 4-speed manual N1234

Cast iron cylinder

Attention: Arrival without kick starter, without shifter, and without intake pipe

(Many replicas exist for this engine, we guarantee the official origin from the YX factory and warn against copies present on the market)

Compatible with all brands of dirt bike, pit bike (YCF / GUNSHOT / CRZ / PISTERPRO / ORION...)

Starting advice: We recommend an engine oil change at startup as well as a break-in of 3 full tanks at half throttle. All settings are done at the factory but a valve adjustment may be necessary during the break-in if you observe kickback/compression returns or at the exhaust valve (Timing: 0.05 Intake / 0.08 Exhaust)

For more information, please refer to the technical data tab

Description of Ignition and Carburetor Stages

Ignition

-Stage 1 (18 euros)

Wiring harness + standard 1-pin CDI + NGK type ignition coil (ref: P0296 + P0299 + P0298-BK)

-Stage 2 (30 euros)

Wiring harness + CNC racing 1-pin CDI + red NGK type ignition coil (ref: P096 + P0298 + P0301)

Carburetor

-Stage 1 (45 euros)

MIKUNI 26 Carburetor + US1 Air Filter (ref: P0020 + US-38-BK)

-Stage 2 (49 euros)

MOLKT 26 Carburetor + US1 Air Filter (ref: P0023 + US-44-BK)

YX Officielle© ranges - from 88cc to 160cc!

A large choice of regrouping YX engines, 88cc, 110cc, 125cc, 140cc, 150cc, 160cc! Parfait pour tous les niveaux!

Modèles

YX 88cc 4-stroke engine - Automatic transmission - Electric start
YX 88cc 4-stroke engine - Automatic transmission - Electric start
YX88-GN
209.00€ 259.00€
YX 110cc 4-stroke engine - Automatic transmission - Electric start
YX 110cc 4-stroke engine - Automatic transmission - Electric start
YX110-GN
219.00€ 269.00€
YX 110cc 4-stroke engine (Semi-automatic)
YX 110cc 4-stroke engine (Semi-automatic)
YX110SA
299.00€
YX 125cc 4-stroke engine - Automatic transmission - Electric starter
YX 125cc 4-stroke engine - Automatic transmission - Electric starter
YX125E-GN
219.00€ 299.00€
4T YX Engine - 125cc (Classic Start)
4T YX Engine - 125cc (Classic Start)
YX125GN
249.99€ 299.99€
4 Stroke / 2 Stroke
4 Stroke
4 Stroke
4 Stroke
4 Stroke
4 Stroke
Engine Capacity
88cc
110cc
110cc
125cc
125cc
Maximum Power
4.1Kw /8000 rpm
-
5.4kW/7500 rpm
6.8Kw/8000 rpm
-
Clutch
Automatic
Automatic
Semi-Auto (88cc, 107cc, 110cc, 125cc)
Automatic
Classic (Starting in neutral)
Number of CVs
5.6hp
-
7.9hp
10 hp
10 hp
Shipping origin
France
France
France
France
France
Start Up
Electric start
Electric start
Kick start
Electric start
Kick start
Bore
47mm x 49.5mm
52.4mm x 49.5mm
52.4mm x 49.5mm
52.4mm x 55.5mm
54mm x 54mm
Cooling Type
by air
-
by air
by air
by air
High Engine Part
-
-
-
-
-
Horizontal/Vertical Motor
Horizontal
Horizontal
Horizontal
Horizontal
Horizontal
Kick Start Size
-
-
13.3mm (Small diameter)
-
16mm (Large diameter)
Low Engine Part
-
-
-
-
-
Maximum torque
5.8N.m/5000 rpm
-
7Nm/6500 rpm
9.5Nm/5000 rpm
-
Comparer plus
Comparer plus
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Disponibilité

In stock

In stock

Out of Stock

Out of Stock

In stock

Motorization

Kick Start Size 16mm (Large diameter)
Engine Type 4-stroke single-cylinder 125cc YX
Engine Capacity 125cc
Cooling Type by air
Bore 54mm x 54mm
Clutch Classic (Starting in neutral)
Start Up Kick start
Fuel Unleaded 98
Clutch Type Manuel
Ignition 3-Wire Ignition Switch (without lighting)
Number of CVs 10 hp
Brand Engine YX
Horizontal/Vertical Motor Horizontal
4 Stroke / 2 Stroke 4 Stroke

Cycle Parts

Oil Engine Capacity 900 ml

Chain and Drive

Chain Size 420
Sprocket Size 17mm

Others

Warranty 1 month (parts only)
Brand YX
Vintage 2025
Type of bike Dirt Bike, Pit Bike
Shipping origin France

Questions about 4T YX Engine - 125cc (Classic Start) (4)

Questions asked in other languages

  • Bonjour j’ai plusieurs questions, est-ce que ce moteur va sur un dirt 125 rfz smx, est ce que en stage 2 d’allumage ya la bobine d’allumage haute tension vendu avec ?

    FR Question from Mehraz Y., on

    Answer from the Mini MX team

    Bonjour, oui compatible, les packs sont détailler dans le descriptif.

  • Bonjour est ce que la ligne doma racing ce monte sur ce moteur . Merci d'avance

    FR Question from Malfilatre S., on

    Answer from the Mini MX team

    Bonjour, les lignes doma sont compatible pour tout les moteur horizontal, les compatibilité des lignes correspondent en fonction des types de cadres.

  • Bonjour ece que les fixation moteur sont les meme sur les 125cm3 et 150cm3 yx ou du moin si il est possible de faire passer un moteur de 150 a la place du 125 d’origine. Merci d’avance

    FR Question from Mathis B., on

    Answer from the Mini MX team

    Bonjour, oui fixation moteur des moteurs horizontaux identique.

Can't find the answer to your question?

YX125GN

Specific References

ean13
3667155106468

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