

⚡ Power your ride with precision and ease — don’t get left in the dust!
The LIYUANJUN 125CC 4-stroke semi-auto engine motor is a versatile, air-cooled single-cylinder powerhouse designed for go-karts, ATVs, and buggies. Featuring 3 forward gears plus reverse, an electric start system, and broad compatibility with popular brands, it delivers 5.8 kW of reliable performance. Ideal for millennial thrill-seekers craving a smooth, easy-to-install upgrade that keeps you ahead on every trail.
















| ASIN | B0CFKLNFF1 |
| Best Sellers Rank | #43,295 in Automotive ( See Top 100 in Automotive ) #5 in Powersports Engine Kits |
| Brand Name | LIYUANJUN |
| Customer Reviews | 4.0 4.0 out of 5 stars (20) |
| Horsepower | 5.8 Kilowatts |
| Manufacturer | LIYUANJUN |
L**A
The kids love it
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
J**A
Good upgrade from a 107cc
Runs like a champ but wiring sucked
B**N
Good price works great
I would have give them a five out of five but we got no instructions or diagram on how to do the wiring other than that the motor worked really good we got it when they said they would ship it and even got it at a decent price
N**H
You get what you pay for.
Keep your old motor, you'll need the spare parts. So far I've used the old oil pan (new one damaged in shipping) and the starter solenoid (burned up before the engine started the very first time). Also the shift pattern is backwards for most. Down to upshift and vice versa. I believe that's typical for put bikes, but weird for a quad. Motor runs ok so far, shifting is rough but may be just breaking in. You get what you pay for though and this rig was very reasonably priced. I would suggest shipping insurance though if you don't have a spare motor lying around.
K**A
Easy
Kids love being able to ride their bike again! Came as it was described good quality at a great price. Super easy install!
L**N
Junk
Worked great for a hour now it just smokes out the vent tube when you try to start it junk do not buy I contacted them and they want a video of what its doing and no way to send them 1 but here it is junk
E**5
Wiring instructions are vague.
Shipping was quick but they broke an ear off the starter and broke the housing off the carb maybe just my experience. I was able to fix the motor and buy a new carb, the wiring diagram was vague and took several hours of testing to complete. Engine ran good once repaired
B**D
Great product
It came a little low on oil. Wiring took a little while to figure out. This was a special build so I didn’t have some of the safety relays that would be on an atv or cart. Engine started first crank sounds great and runs good out of the box. I used it for a winch motor on a trailer that will be hauling wood from 200 feet up a steep hill.
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