Chinese Scooter 49cc to 80cc Big Bore Kit QMB139

  If you are looking to get a little more power out of your scooter, this is by far the best bang for your buck! This will convert your 49cc engine to an 80cc engine. The take off speed will be twice as good and the top speed will increase a bit. This will solve the dreaded loss of speed going up hills. Your fresh 80cc big bore kit will now have the muscle to push you up hills and help with the take off speed from a dead stop. No more people honking at you for going slow as a snail... you get the picture! This kit is what you need! At Rolling Wrench we use nothing but the best. We install these kits on a regular basis, it took a lot of different kits for us to find a big bore kit with a decent price that actually holds up and is reliable. We did a lot of testing with the eBay/amazon kits, they failed over time almost every time. This 80cc kit is the ticket. These are fairly simple to install especially since we put together a "how to install a big bore kit" video. Any questions just a