140CC Engine 4 Stroke Racing Engine, 4 Speed Horizontal Single Cylinder Motor Engine CDI Kick Starter Manual Clutch Fit For Pit Dirt Bike, Honda CRF50 CRF70 XR50 XR70 Z50 Z50R

I bought this as a replacement from my ssr 125 TR, was very easy to install, was able to hook it up to the previous wiring by connecting three wires and the cdi box. The bike started up right away with no issues after I connected everything. only cons I have is that it is difficult to find nuetral, the gearbox can be very stiff and stubborn when trying to do so, the 1-0-2-3-4 transmission is less efficient than the 0-1-2-3-4 gearboxes on my other ssr pitbikes, other complaint i have is the very stiff clutch, the lever requires alot of pressure to pull back and makes it difficult to use only two fingers but i am hoping the spring will become more flexible over time. Overall I am satisfied with the engine and dont think i would have found a better one for this price, I will update this review if any major issues come up.

Garbage !!! Out of box with smashed unusable connector to CDI. I was able to use an old connector and install into the bike. Just to find out the motor has zero compression. Absolute junk

This engine is fantastic. No oil leaks whatsoever out of the box and it lined up just perfectly with the motor mounts on the frame of my Apollo, 125. It started first kick after I got done building the bike and runs near perfect. I just need to adjust the air fuel mixture screw on my Mikuni VM22 carb. Super stoked to ride this thing around after I break it in.

I was leery about buying this engine but I was super impressed. I mounted this on a Kayo 125 TT frame and all holes lined up. I did end up putting on a different carb so I could connect it to the air filter that is mounted on the frame. Neutral is hard to find which is why I gave it 4 stars. The engine started on the first kick and has plenty of power and speed. I am going to purchase an oil cooler because the engine gets very hot.

Only reason it’s not 1 star is because it actually ran. Out of box the head and cam gear cover were cracked. The transmission is hard to shift and will go into gear randomly when kickstarting it. Also not sure if it’s even 140cc. It’s stamped 140cc on the cylinder so I was just gonna throw a head I had lying around on it but the piston is like 1mm smaller and the cylinder is 1/4 in shorter then the stock 140cc cylinder that came on my bike.

Es muy bueno

Shifting the transmission kind of sucks and you have to be in neutral to kick it also the clutch slips when you give it a firm kick but I think I can open it up and adjust it. But it was $300

Runs strong and smooth. Kicked over the third kick