

⚡ Power your passion with precision and control!
The LIYUANJUN 125CC 4-Stroke Engine Motor Kit is a robust, air-cooled single-cylinder engine designed for mini dirt bikes like Honda CRF50 and XR50. Featuring a 6.5 kW max power output, a fuel-efficient PZ22 carburetor, and a 4-speed manual clutch transmission, it delivers smooth throttle response and precise control. The CDI ignition and air-cooling system ensure reliable starts and prevent overheating, making it an ideal upgrade for enthusiasts seeking performance and durability in their rebuild projects.
















| ASIN | B0CD2F712S |
| Best Sellers Rank | #45,057 in Automotive ( See Top 100 in Automotive ) #2,144 in Powersports Parts |
| Brand Name | LIYUANJUN |
| Customer Reviews | 4.2 4.2 out of 5 stars (58) |
| Included Components | 125CC 4-Stroke Engine Motor |
| Item Type Name | 125CC 4-Stroke Engine Motor |
| Manufacturer | LIYUANJUN |
| Model | 125CC 4-Stroke Engine Motor |
| Model Name | 125CC 4-Stroke Engine Motor |
| Warranty Description | 125CC 4-Stroke Engine Motor |
P**E
The world is a cruel place
The motor is great but the delivery Person could not follow instruction
P**S
Not bad at all had a few issues but nothing major
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.
M**0
Runs like a champ!
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.
C**R
Great engine
Great engine but what size chain does it take
E**S
Please do not buy from this seller!!
I ordered the 125cc engine for an application listed in the description. There are major safety concerns if installed. Brake lever is not usable, foot pegs are not usable, kick stand is not usable, intake does not line up, exhaust does not line up. I tried to return the item over my safety concerns I have received nothing but a run around and told I would have to track the return and notify this seller that it was received at their warehouse then I could request my return and pay restocking fees and shipping. I received the item 26 hours after purchase, made to wait 72 hours for return label to then find out I would loose additional money to shipping and restocking. Please do not purchase from this seller. They purposely make it very difficult and not worth the time or money to return rendering you stuck with the purchase. I filed complaint with Amazon and waiting to hear back. Also do not buy any Protection plan because it is worthless and will do nothing to help you in any situation.
V**N
Before you drive yourself, insane adjust the magneto
So after installing, tried to see if there was a spark, which there wasn’t, I gone through two starter coils and three wiring harnesses before I found out that the magneto needed to be adjusted but the outer cap to the magneto was not right had to use my old one before I got it to park but definitely should have put somewhere on there that this may need to be adjusted Because I don’t think the normal person would even know to do this countless videos before I found one that told me what to do other than that runs great looks great and would buy again
J**D
It works
Runs well, but leaked oil from the first time it was filled.
A**M
Engine is Great could be More durable
I’ve purchased the engine on May got it on the 20th of may, been riding Around in my Apollo Rfz swapped with this engine ever since, it’s currently august 15th and the bike still runs Real strong, Still idles good starts up 1-2 kick with or without Gas, I have an aftermarket 24mm carb on it, pops wheelies Like it’s nothin, Definitely will be buying this engine again 100%
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