Description
Comparison points and tradeoffs
When comparing 125cc 4 Stroke ATV Engine Motor Kit, Single Cylinder Semi Auto Transmission W/Reverse Electric Start Engine Replacement Kit for 125cc All Sizes of Karts and ATV with other Rebuild Kits options, use this source-backed detail as the primary discriminator: Fits (For the reference): 125cc all size ATVs 125cc all size Go Karts. Compatible Models include: Blade, Kinroad, Roketa, KPX, SUNL, Aimex, Alpha sports, BMS, BMX, Cool Sports, Baja, JCL, Taotao, Peace, JM Star, Jonway, Kazuma, KMD, Kymco, Lance, Linhai, NST, Redcat, Roketa, Tank, X-Treme, Yamati, Coolster, Terminator, Lynx etc.
Use this second fact to evaluate the tradeoff: Specification. A third point to compare across alternatives is: Product identity: 125cc 4 Stroke ATV Engine Motor Kit, Single Cylinder Semi Auto Transmission W/Reverse Electric Start Engine Replacement Kit for 125cc All Sizes of Karts and ATV.
Alternative-selection boundary
Choose an alternative when its stated identifiers, application, package, or specifications better match the requirement; no unverified competitor claim is introduced here.
Complete source-backed product details
Product Description
PRODUCT DESCRIPTION
125cc 4 Stroke ATV Engine Motor Kit, Single Cylinder Semi Auto Transmission W/Reverse Electric Start Engine Replacement Kit
If you are a driving enthusiast who loves freedom and pursues speed and passion, our 4-stroke ATV motor engine will be your ideal choice. Its excellent performance and stable power output make your driving more enjoyable and comfortable. Buying this 4-stroke ATV motor engine means choosing a high-quality, high-performance, and safe driving experience.
PRODUCT HIGHLIGHTS
Strong Power
This ATV motor engine boasts a robust 7.64HP horsepower, a displacement of 125cc, and a max rotating speed of 7500RPM, which provides you with strong power and ensures that your drive will be very smooth and powerful.
Durable and Sturdy
The engine is equipped with premium aluminum and cast steel, ensuring superior performance and a longer lifespan and adapting to complex environments and conditions.
Effective Cooling System
By adopting an air cooling system, the temperature of the engine can be quickly reduced, effectively preventing overheating and ensuring smooth and long-lasting driving.
Application
- The closed design effectively prevents dust, water, oil, etc. from entering the machine, while minimizing the need for daily maintenance as much as possible.
- The different wires have different colors, thus easily distinguishing and connecting them without confusion.
- This product can be widely used in motorcycles, ATVs, go-karts, tricycles, etc, as long as the crankshaft matches.
Key Features
Easy to Install
Our ATV motor engine is pre-installed and you only need to spend a little time and effort to complete the remaining parts, enjoying a sense of achievement!
Easy to Operate
The CDI ignition system (not included) leads to higher energy and ignition efficiency. So you can start the motor engine quickly and safely
Adjustable Speed
Its 4-speed manual transmission provides you with high-precision gear shifting control, so it allows you to easily adapt to various changes. It makes your driving experience more exciting under different road conditions.
Lubricating Oil Filter
- Lubricating Oil Filter can help filter solid stains from lubricating oil, largely reducing wear and prolonging the engine service life.
- Gearshift Shaft can control the vehicle’s speed to suit different usage scenarios.
- Shockproof Installation Hole is used to install shock absorbers to reduce vibration during driving, thereby improving its driving comfort.
- Forged Crankshaft adopts a high-quality metal design to ensure high safety and stability during operation.
Specification
- Engine Type: Single Cylinder, 4 Stroke, Horizontal, Two-stage Transmission;Material: Aluminium, Cast Steel
- Other Features: 3 Forward Gears and 1 Reverse
- Engine Cooling Type: Air Cooling
- Ignition System: CDI (Not Included)
- Start Mode: Kick-starter; Electric
- Clutch Type: Manual Wet Multi-Disc
- Transmission: 4-speed, Manual Gear Shift
- Displacement: 125CC
- Minimum No-load Stable Speed: 1400 (1 ± 10%) R / min
- Compression Ratio: 8.7:1
- Bore Stroke: 54*54mm/2.12*2.12inch
- Max Power: 5.8Kw/h
- Max Torque: 8.0N-m
- Max Rotating Speed: 7500rpm
- Horsepower: 7.64HP
- Air Inlet and Exhaust Valve Clearance: 0.05 ~ 0.07 mm (Cold State)
- Min Fuel Consumption: ≤367g/kW.h
- Spark Plug: A7TC
- Carburetor Type: PZ19 (Not Included)
- Min Stable Idle Speed: 1500r/min±150r/min
- Primary Reduction Ratio: 3.722
- Transmission Ratio of Each Gear: First Gear: 3.272; Second Gear: 1.938; Third Gear: 1.350; Fourth Gear: 1.043
- Lubricant Capacity: 900ml/0.23 Gallons
- Lubricant Type: SL10W/40 (Not Included)
- Crankshaft Diameter: 1.5cm/0.59inch
- Crankshaft Length: 0.4cm/0.15inch
- Gasoline Type: ≥ 92 #
- Product Size: 45*30*25cm/17.71*11.81*9.84inch
- Gross Weight: 19.45kg/42.87lbs; Net Weight: 18.15kg/40.01lbs
Source product highlights
- Great Power: It has horsepower up to 7.64HP/7500±500Rpm (5.7KW/7500±500Rpm) and maximum torque up to 8.0N.m/5500±500rpm. It is a motor with great output power
- Fits (For the reference): 125cc all size ATVs 125cc all size Go Karts. Compatible Models include: Blade, Kinroad, Roketa, KPX, SUNL, Aimex, Alpha sports, BMS, BMX, Cool Sports, Baja, JCL, Taotao, Peace, JM Star, Jonway, Kazuma, KMD, Kymco, Lance, Linhai, NST, Redcat, Roketa, Tank, X-Treme, Yamati, Coolster, Terminator, Lynx etc
- Efficient and Durable: The 125cc 4-stroke engine is made of an aluminum cylinder head and iron cylinder block, which is more durable. High power enables high-speed operation of the motor and ensures high efficiency.
- Includes: This 4-stroke air-cooled engine with reverse semi-automatic transmission has electric start. The kit comes with intake pipe, drive sprocket, sprocket cover and spark plugs, but without carburetor, battery, CDI, voltage regulator, ignition coil, etc
- Heat Dissipation Design: The outside of the cylinder is covered with metal fins. When the cooling fan blows air through the fins, the heat generated by the engine is released directly into the air




Justin Woolard –
I used this motor on my go cart and fit perfectly Super fast, quiet, easy to install. and easy to start. Starts every time with no problem Quality was perfect. Arrived on time. Was everything as described
Jorge rivera –
The motor works just fine but the cover is crack costumer service is terrible from this company returning this oneam not buying from them never again
Customer666 –
Nothing to distinguish which wires are which, has a wire set without a plug, and a wireset with a plug, but no way to tell what goes to what, bought a similar design engine from another company and had it fired up in 5 minutes, I’ve been fighting this one for a couple days trying to get it to have spark when cranking. I’d probably suggest a different option.
Blksheep –
This semi-automatic engine is excellent! It makes shifting gears easy and intuitive. Highly recommended!