110CC Auto Engine Motor,4-Stroke Electric Start Single Cylinder Engine Motor 2-Valve Transmission 2-Valve Motor for ATV GO Karts 308-999003

This 140cc 4-stroke engine is a decent replacement for pit bikes and small motorcycles. It delivers good power for its size, and the 4-speed manual clutch works as it should. The air-cooled system does its job, keeping the engine from overheating during regular use.Installation was straightforward since it matches the original specs for my Honda XR50. The kit includes all necessary parts—carburetor, CDI, gaskets, and mounting hardware—so no extra purchases were needed.Performance is adequate for casual riding, with enough torque for light off-roading. However, it’s not a high-performance racing engine, so expectations should be realistic. One minor issue was that the carburetor needed slight tuning out of the box, but nothing major.Overall, it’s a fair option if you need a budget-friendly replacement engine that fits Honda CRF50/XR50-style bikes. Just double-check compatibility before buying. Would recommend for basic use.

Just installed this 125cc engine on my go-kart, and so far, it’s running pretty well. The power is solid—definitely an upgrade from my old motor. The 3-speed gearbox with reverse is super handy, and the electric start works without any hiccups. Wiring was a bit confusing at first, but the color-coded harness helped sort things out.The build feels sturdy, no weird noises or vibrations, and it bolted right into place (double-check your model first, though). Only minor gripe is the instructions could be clearer, but if you’re familiar with small engines, it’s manageable. Seller was responsive when I had a question, which is a plus.For the price, it’s a decent deal if you need a reliable replacement or upgrade. Just make sure you’re comfortable with the install or have a pro handle it.

Would not recommend buying this engine don't waste your hard earned money on it. Got one sent out came in pretty quick but couldn't not get running had spark and gas and air simple should start nope customers service was nice enough to send a second engine got running same day but always had clutch problems either was engaging all the way or at all even bought a different cable length to help nothing worked. Ending up getting to a point and it was fun till 🙃 the transmission let go of 3rd gear no matter the adjustment or cable u have that clutch will not full engage for a smooth change of gears and no information available to help you fix the problem spend ur money some place else do more research than I did

Motor had a hole in exhaust and in head couldn't build compression wouldn't run. Asked for refund and they sent me another Motor. Asked them to make sure new Motor didn't have the same problem that they admitted was do to the mold. Got the second Motor and same exact problem. Motor is only good for scrap metal don't buy

Never could get it to run correctly. Would start and die. Tried tuning carb, adjusting everything i could. It fit on the mini bike fine, but the wiring harness would smoke when hooked up to battery. Wouldnt buy again.

Clutch slips out the gate and shifter pin wears out almost immediately thing is junk

I installed it on my XR70. Had to figure the wiring out, I checked many wiring assembly videos, but fortunately the assembly is not very difficult, It started very unsmoothly with its own oil, but after changing to 10w/40 oil, it ran much smoother. So far happy with it. Starts and runs good.