50mm Cylinder Kits for GY6 49CC 50CC 139QMB Engine, Upgrade GY6 100cc Big Bore Rebuilt Cylinder Kits 4 Stroke Motor for Moped Scooter ATV Go Kart.

I rebuilt a 50cc scooter and the kit greatly increased the proformance. It’s a great value

I dislike the fact that I didn't go and thoroughly check the part cause I installed it and I broke the part in no problem then the next day I started it okay made a little chatter noise get to a stop light and I se smoke just barely I get to my brother house shut it off it makes that noise again I have My brother come out and l start it it makes the noise but worse and it's smoking and there's still oil dripping I break it all the way down and the piston is fine I thought the rings lined up no there is a big indention on the inside of the cylinder like a hammer the size of it and the shape you can tell it is factory flaw but I was told I can't return it because I used it so I had to buy a different one I got a Glixal and it is a very nice one so I have a 25 dollar paper weight

Exelente

Great product

Amazed!..Sleeve came with piston and rings assembled.. attach piston from the sleeve . Anchor sleeve finish adjustments then break in!! N

Im a lady mecanic and Ive built many upgrades this kits is good,I mean read another review and laughed at how HE said he was a mecanic and had a hard time,Well thats funny,its good for the price works god if you know what your doing,as wih ANY PART IF YOU DONT KNOW WHAT YOUR DOING THEN ITS SIMPLE PAY SOMEONE THAT DOES...THIS KIT IS A GOOD ONE...EASY TO INSTALL👍))

Package was bad box was broke bag was open. One gasket was torn. Looks to me like it was just trown around like it was a towel. It was a piston and jug and other very breakable parts. May e be more careful in the future

works good only had one kit out of many that came with bent head gasket