GOOFIT Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart

Bolted right onto a Wolf RX50, runs really well, hopefully it lasts longer then the factory piston did. Quality seemed as good as what came off, definitely more power . Kit came with everything in the pictures. I would recommend and buy again.

I have purchased two of these kits and installed both with great success. Three hours to do each one. Be aware, you should have some pretty good mechanical skills or it's not something to tackle. The quality of the parts is great. If it were labeled Honda for example, it would be a major purchase. We now can fly up hills that stopped us before. You will need the carb. Upgrade too or you will achieve nothing.

This big bore kit is really good quality. Ive put well over 400 hard (45MPH,7000RPM) miles on this along with a jetted carb, flat piston and upgraded transmission. Used factory head for higher compression, but i dont know if this will work on every gy6 as there are a few variations between the different brands. Only reason this is 4 stars not 5 is because it didnt come with a longer wrist (piston) pin even though its supposed to. I used the original one figuring it would be fine. BAD MISTAKE. shredded the piston. But the cylinder was fine. After i took it all apart again i got another piston and pin and since then its held up great. I love the quality that goofit produces, just wish they made sure they sent everything they say they do.

It’s worth every penny. It’s an easy install and definitely a noticeable power upgrade when you dial the carb in. The products i received looked super clean and Iv put 120 miles on it so far and am very pleased. For 30 bucks just go for it

The quality of the big bore kit was fragile. It didn't last long

Everything you need is included, no issues at all. Really improved the power on my Bintelli Escape, I can now climb hills with ease, no more holding up traffic haha

Put on my taotao racer 50 50cc moped for a little more power and got exactly that. Fit perfect and works very well. I am gaveling aproblem with it warm starting but that's my fault as I dropped the carb and messed something up.

This was a good buy. Worked great in my tao50. Pretty easy to install, has outdated style of wrist pon clips which if you haven't used these they can be a pain. Good quality and machining. Just this and a 85 jet in carb and I went from 37 mph to 47.

Instalation was easy and runs perfect as of 20 miles

HALLO SOWEIT PASST ER ABER ICH BITTE UM ERSATZ DER DICHTUNGEN ,habe grossen oil verlust sprich es kommt aus der seite raus aber sonst ok.. hoffe auf ruckmeldung lg

It measures exactly the same as the 50cc set that I already have

C'est un pur bijoux se kit et juste parfait avec qu'elle que problème pour maître le piston dans le cylindres mais je mais quand même le Max en étoile psk il les veux largement

Passt alles nur sehr Schlecht und der Kolben ist beim Einbau gebrochen, absolut nicht zu empfehlen!