Hello, my name is noah, i own a gy6 50cc 139qmb scooter (exact model is gator grace 50), and in my area where i drive the speed limit is 30 but there making it 40 due to just no one obeying the 30mph speed limit so why not make it 40 right? So i would like to get more out of my scooter, right now the max speed is 32mph, i am thinking about buying a new exhaust, a big bore kit and a 150cc carb, and some new roller weights, and here are the links to them. just wanted to see if anyone know how fast it will go after i install these parts, im 5''11 190 LBS
Welcome to the forum. That carb is not a real 20mm carb. It is just machined out to look like it is. Exhaust is not available anymore. You don't really need to upgrade the stock exhaust on a GY6, as they are not restricted. I don't know anything about that kit though.
Yamaha Aerox NS50 2016 project Yamaha Aerox NS50 2016 Piaggio Typhoon 2019: Great scooter, poorly built (sold) Yamaha Slider 2002: The problem child (sold) Yamaha BWS NG: The Family affair (son now owns) Yamaha Aerox YQ50 2008: The fast one (sold) Yamaha Jog RR 2004: The first one (sold)
Mrs Bud 10/06/22 you are not going to pull that engine apart and put lots of new bits in it, are you?
GOOFIT and GLIXAL have been selling for years on both of the big two. They also are selling on aliexpress. If you want relatively easy return conditions at a bit higher out the door, stay stateside. They both sell items that are good, and items that may be a bit questionable. Replacing both head and cylinder when going BBK keeps the compression ration within reason when going to the largest bore possible. The kit does not mention the diameter of the piston & cylinder... 72cc or 83cc or 63cc... who knows. Most have found the 47mm/72cc cylinder/piston to work acceptably with the original cylinder head. I have not heard or any complaints using the original. Be aware that this kit is for 64mm length valves. It will not work with the other length. I do not know why that is mentioned as the head, cam, rocker arms ..... never mind. No cam. The cam may be specific, though I do not think so. The diameter is given in the pictures - 50mm. Performance to expect is an unknown, but I have gotten 72cc kits - 47mm - to go 40mph. Maybe. Did not have a GPS to check, and speedo was buried. tom
Last Edit: Dec 31, 2022 11:24:50 GMT -5 by GrumpyUnk: freddy fumblefingers was typing
It's not how hard you work, it's how much you get done. simplificate & add lightness