My 49cc board to 100cc gy6

[chrisherrmann941]

What all should I do now? I want top end and more power to get to the top end.....

[christopher]

Buy a bigger scooter? Did you upgrade to a performance cam also? I bought a 50cc moped because it is street legal without a motorcycle license, and I want my wife to be able to ride it. I would buy a 150cc or so two stroke if it were just me. 

[scooterted]

You didnt really say what you had done.

By 100cc i assume you mean a 50mm bbk, which is actually around 80cc. You could move up to a 52mm bbk which will put you around 90cc. Then a stroker crank will give you another 5cc-ish.

Gears might get you what you want.

Or you can engine swap. Go crazy, gy6 qmi/qmj with a 67mm bbk, nos and turbo.

[dexameth]

You really wanna make power with that 139QMB? I got you. It's not cheap, but my little Scootie is at a true 93.4cc and puts some stock 150s to shame off the line. Yeah, 150s will overtake around 45 but it's nice to have that crazy power to flow effortlessly with traffic.

A lot, I mean a LOT of power is all in the head. How much it can flow as well as the combustion chamber all are critical really. This head is probably one of the best, if not THE best, head on the market. Allows you to use a 24mm stock GY6 carburetor and intake and really feed the engine. That kinda carb setup on a cheaper big bore doesn't quite work as the heads have tiny ports and can cause crazy turbulence in the intake tract. It'll work, but not like it should.

You can add a performance cam like the SSP-G cam, with is a little more "grunty" over the A9 cams found all over the internet.

The stroker crank requires a full engine rebuild, but I feel like it's completely worth it if you are looking to squeeze the most out of these engines. This really give you the torque for that punch off the line, or climbing hills.

Once you have made good power from the cylinder/head you can then add gears in the rear end. Most gear sets require a press, but there a drop in style by Jasil, and then the even taller gears if you have made gooooood power.

Then the CVT comes into play, LOTS AND LOTS of tuning in the CVT. We can talk about that later.