Help me squeeze a few more mph  By  xxwoodmanxx (Read 2,604 times)

Speed is attained through more than power. Your top speed is based on your power and weight. You can increase power or decrease weight to go faster. Additionally how much wind resistance or drag you and the scooter produce is also a factor. If you want more speed add a windshield or decrease the weight of the scooter it can often be cheaper than engine mods...

You need aerodynamics, some windshields are not aerodynamic, and thus slow you down.

Best thing you can do is just keeping it simple. Put a BBK on it, put a performance exhaust (one with large exhaust tip), rejet the carburetor, change the gearing, and adjust the rollers.
Additionally you will want to play around with adjustable CDI's.
That's it. A good $300-$500 to gain perhaps 5MPH tops.

I GPS'd my sustained speed today(very windy), and I managed to get to 53mph, even though the speedo said 68mph (pffft!!). And yes, I also have a full indshield too, so I'm certain that was an issue as well.

I DO see the logic in getting the case machined if I plan on splitting the case for the crank. As for the weight reduction, I don't plan on removing any plastics/parts to shed a few oz. And I'm in no need of a diet, so we're good there

You can port the head or opt for a 4 valve head and a high compression piston . I run 12g sliders in my 150 so maybe you can try a gram or two heavier slider . Allley is right a BBK makes more power but may yield the same speed . I went from a 63cc to a 82cc or 50mm BBK on my old scoot it took off faster and had more power uphill but had the same top end . Remove the clutch to get to the cover plate where the gears are . Count the teeth you have and you may opt for a taller final drive gear . They slide out but you need to go to a machine shop to get the new gears pressed together . With gear changes you most likely may need to try a gram lighter if takeoff and uphill is less . Getting the tires balanced really smooths out the ride .

My Echarm has Ducatti EFI and wow the diff from a carb is amazing with instant response and starting , better MPG and more power . Check out www.ecotrons.com MBE also sells EFI kits plus crate engine like a LC Gy6 , a 180cc and a jugged and stroked Gy6 to a 236cc www.mbe-motorsports.com/catalog/index.php/cPath/20?osCsid=mrdg4avagrlnvn45ietov2omi7

No 30mm is to big, also the intake will not match the head intake port the 30mm intake will be to big and you will have restricted flow into the intake.

I am running a bored out 157QMJ to 182ccs from 149.6 with a stroker crank and a 24mm carb with a 122.5 main jet and 38 pilot jet. A 125 main jet was to much fuel.
Alleyoop

Ok. Just assuming that I can adjust the fuel however I need it, but I'm limited as to how much air I'm putting into my 24mm carb, minus the UNI filter. Now that you mention it, when I upped to a 125 mj, it would bogg out my motor on deceleration, and stall. the 120 main jet was just a bit too big as well.

Porting the stock head intake exhaust, as well as the combustion chambers? How about advancing the timing by one chain link on the timing chain? I have a Chinese racing CDI (blue), but I'm not too terribly certain as to how well it adjusts/advances the timing.