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LIYUANJUN

125CC Engine Motor, 4-Stroke Semi Auto Engine for Go Kart ATV Quad Bike Buggy CDI/Air Cooling System Single-Cylinder with Reverse and 3 Forward Electrical Start

  • Based on 66 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Jirestoo
Arrives Sunday, Mar 8
Order within 7 hours and 53 minutes
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Size: 125 cc 4-Stroke Engine Motor


Features

  • About WiringsFive wires (plug) is for gear indicator; yellow wire is for storage battery; pink (or yellow) wire is for storage battery; black & red wire is for signal trigger;green wire is for grounding; blue & white is for trigger coil.
  • Compatible with This 125cc engine motor is suitable for pit bike, dirt bike, buggy, pocket rocket, go-karts, atvs, track bikes, quad and so on. It fits for Atomik, for Pitpro, for TDR, for Xmoto, for Trooper, for Motox, for Trojan, for Blitz, for Raider, for Zongshen, for Chongqing, for Loncin, for Ducar and more.(For the reference)
  • Parameters 1Engine Size: 125cc; Gear System: 3 Forward; Neutral; Reverse; Type: Horizontal, Single-Cylinder, 4-Stroke, Air-Cooled; Start Method: Electrical Start; Bore X Stroke: 52.4 55.5 Mm, 119.7 Ml; Top Engine Mount: 92mm; Bottom Engine Mount: 82mm
  • Parameters 2Idle speed: 1500 r/min100r/min; Front sprocket: 428 - 14T; Ignition: CDI; Air Filter: 35mm; Carburetor: PZ19; Lubrication: Pressure/splash; Oil capacity: 900ml/0.23gal; Maximum torque/ rpm: 8.5 N.m/5000r/min250 r/min
  • Warm NotePlease note that the machine originally has oil, but the machine still needs add oil before it can start. Gasoline and engine oil volume mixing ratio, running-in period 25:1, late running-in period 30:1

Description

SpecificationsMaterial: Iron, AluminumProcess: Die Casting, PaintingColor: SilverEngine Type: Parallel 4-Stroke Single-Cylinder EngineTransmission System: Forward-Neutral-ReverseStarting Method: Electric StartIgnition Device: CDICooling Method: Air CoolingStarter Type: Foot StartLubrication Method: Pressure/SplashFuel Type: GasolineCarburetor: PZ19Displacement: 125CCMaximum Power: 5.5KWCompression Ratio: 9:1Max. Speed: 7500±375RPMIdle Speed: 1500±100RPMMax. Torque: 8.5 N.mFront Sprocket: 420-17mm-14TFuel Tank Capacity: 900ml/0.24galAir Filter Diameter: 35mm/1.38inCylinder DiameterStroke: 52.455.5mm/2.062.19inTop Mounting Hole Spacing: 92mm/3.62inBottom Mounting Hole Spacing: 82mm/3.23inBolt Spacing: 152mm/5.98inWay of Use: Direct Replacement Product Size: 483630cm/18.914.1711.81inPackage Size: 5037.532cm/19.6914.7612.6inGross Weight: 21.95kg/48.39lbsNet Weight: 21kg/46.3lbs Package Included1 125CC 4 Stroke Engine MotorAll Accessories for Assembly Fits (As a Reference)For Atomik, for Pitpro, for TDR, for Hummer, for Orion, for Xmoto, Lei, for Dmx, for Swd, for Tomahawk, for Go Kart, for Quad, for Dirt Bike, for ATV, for Pit Bike, for Buggy, for Rocket Car (For 125cc Engine Size) Notes1.We strongly recommend professional installation. 2.Please double-check compatibility before purchasing to ensure proper fit.3.Please allow for slight color differences caused by shooting light and errors caused by manual measurement, and make sure you don't mind before ordering.

Brand: LIYUANJUN


Horsepower: 5.8 Kilowatts


Manufacturer: LIYUANJUN


Manufacturer: ‎LIYUANJUN


Brand: ‎LIYUANJUN


Manufacturer Part Number: ‎AC-YCZYQ-3381


Date First Available: August 14, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Mar 8

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Good upgrade from a 107cc
Size: 125 cc 4-Stroke Engine Motor
Runs like a champ but wiring sucked
Reviewed in the United States on February 15, 2026 by Jose herrera
    • The kids love it
Size: 125 cc 4-Stroke Engine Motor
Great little engine! Fast shipping! Got this as a replacement for one of the kids little off-brand atvs. Bolted right in. Sounds great! East to install. There was no instructions for the wiring harness so there was a little trial and error hooking it up but works great. Starter solenoid died after cranking it over less than 3 times trying to get it started for the first time but luckily I had the one off the old harness. Get a better air filter. The one in my kit was just foam and already ripped and crumpled. Oh and the shift lever is unusable in my application. I honestly don't know what it would actually work in. Lol Overall is it perfect? Nope. But I still have it 5 starts because, the shipping was really fast. Faster then expected by 3 days! Engine is nice. Sounds good. Direct bolt in replacement. Some of the accessories that came in the kit were a little chincy and unusable. Overall it's a great deal ... show more
Reviewed in the United States on March 20, 2025 by laura
    • Runs like a champ!
Size: 125 cc 4-Stroke Motor Kit
This rating should be lower but the actual engine runs great, fit well and the price is incredible! Reason I would have rated lower is the CDI it came with did not work, luckily the old one did. The pipe from cylinder to carb had a hole casted in it rendering it useless, again, the old one worked. This could be good or bad but since I hate wiring, it was bad to me... It comes with at least twice as many wires as I needed. Again, this could be a positive for some. ... show more
Reviewed in the United States on December 4, 2025 by mhansen00
    • The world is a cruel place
Size: 125 cc 4-Stroke Motor Kit
The motor is great but the delivery Person could not follow instruction
Reviewed in the United States on February 24, 2026 by Patricke
    • Not worth it.
Size: 140 cc 4-Stroke Racing Engine
Review Image by Jr Jr
Okay, Engine got here today was supper excited so I installed it for my son so we could go out for a ride. Well the kick start only engages like 1 out of every 5 or 10 kicks. Okay got it started let it idles for 2 minutes shut it off, now go to start it again started up but the engine started to make a horrible noise so I let it cool down check oil and gas it’s all good still. Go to start it again NOW it won’t even kick over at all seems locked up! Waiting on a response from seller supper disappointed for spending over $350 on this engine and shipping. ... show more
Reviewed in the United States on February 3, 2026 by Jr Jr
    • The quality of customer service is outstanding
Size: 140 cc 4-Stroke Racing Engine
Review Image by Logan T Logan T
Review Image by Logan T Logan T
Fantastic engine and customer service the engine showed up early and was in perfect condition besides one cable that got pinched and cut but I messaged them and they refunded me some money to purchase a new one. Can't complain with that, thank you much! And for anyone wondering how to wire the engine I've attached a picture from the Internet on how it's done. ... show more
Reviewed in the United States on May 17, 2025 by Logan T Logan T
    • Not bad at all had a few issues but nothing major
Size: 125 cc 4-Stroke Motor Kit
We ordered this motor to do a rebuild for the second time me and my boys 3, and 5 years old but right away out of the box we had issues got the motor put together and tried to fire it up but we were not getting spark at all we tried everything even replaced the stator plate spark plug coil and ignition switch then last but not least the cdi and we finally got spark but it still wouldnt start and then i decided to use my old carburetor from a previous motor and two weeks after buying it we finally started the motor and took a drive yesterday afternoon now i will say we did purchase the premium 4 year protection plan but we decided to take the time ourselves and work this brain scratcher out ourselves but iam wanting to have my stator plate and carburetor replaced due to it belonging to my other project bike but this motor was garanteed to start with everything it was shipped with but all in all iam pretty impressed great motor excellent performance now i will say the first time my boys an i built this bike it was stolen from us twice in one week we got it back both times with our own hard work but this bike is a family hobby for me and my growing boys as we are all 3 of us new to the power sports world this being our first bike but second time we built it. ... show more
Reviewed in the United States on March 14, 2024 by Pauline and dallas
    • Seems worth it
Size: 125 cc 4-Stroke Motor Kit
Starts pretty easily. Idk how but I ended up with a small crack in case near rear motor mount which leaks a little oil not sure how it happened. Box arrived destroyed and engine was covered in oil in a bag. Sounds pretty healthy otherwise
Reviewed in the United States on November 15, 2025 by Zachary Bullock

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