Trkimal 100cc Big Bore Kit for 64mm Valve - 139QMB Moped Scooter Engine - 50mm Bore Upgrade Set with GY6 Cylinder Rebuild Kits, 6pin Racing CDI Ignition Coil, Performance Spark Plug, and Clutch Spring Review

Bought 3 friends who used my computer to buy theirs and I bought 2. His oil burned from day one. The first set I installed sucked the valve up after 30 miles. the second had a defective gasket kit (unfortunately I had some from another supplier). After the repair, the engine smokes and eats oil. I will never buy a Trikimal product again.

Definitely avoid, don't buy this. that does not work. Plus, it's actually an 81cc displacement with a 50mm piston. Just don't waste your money, it's all lies and the company doesn't care about you. It's just a shot machine running around

Explodes after 100 km. We're waiting for a replacement set, let's see how long it lasts. Installation by a professional engine builder should not be a problem. They stood behind the product and sent me two new kits for free, all back together and everything seems fine. I think the kit was made wrong but this company will fix it.

I have worked with many engines but never with a scooter. I couldn't believe everything in this set for the price. Less than four hours passed between loosening the first screw and starting the engine at a leisurely pace. The scooter works great now. Torque and power are higher than I expected. Works smoothly. And he started right away. Now I just need a new starter because the compression is so high and it's good! The old starter works but could be better. Update: still works great!

I installed it, everything went fine, it took 4 hours to complete the installation, it started right away, it worked for about 5 minutes, now it's gone Beginning. I think these are defective rings, possibly a large bore cylinder. I heard they have a great client so I will contact them. They replied the same day and sent me a new set of cylinders and pistons to install after the rain. Amazing customer service! I hope it works after I put it back together. Put it back together and it will work…

Because it's essentially a standard upgrade, it includes seals that you won't even use in most cases, depending on your application. It's a nice touch as all too often many of these types of kits don't work. There's nothing more frustrating than completing a project halfway or better, only to find that gaskets, certain screws, nuts or components are missing. You then have to put your project on hold and wait for the part you want to start with. Available for 64mm or 69mm valves. Let me clear up