KymcoForum.com

Drive boss mod will increase top speed. Tuning the variator will help with acceleration, as well as overall driveability.

Sent from my SM-G900V using Tapatalk

I didn't see you mention it, but make sure you're getting the right kind. I think DC is standard among 139qmb engines, but kymco uses AC (someone correct me if I'm wrong).

To the poster stating he can run 45-50 all day long:  are you talking mph? And is that speedometer or actual (gps verified). My scoot runs great, but it will only do 44mph (gps verified) downhill (and I'm pretty sure it goes into valve float at that point). The speedo is reading somewhere over 55mph at that point. I've found that on my scoot, the actual speed in mph is pretty close to half of the speedo indicated kph. That being said, i can do 35mph (actual) fairly easily on flat ground most of the time. The slightest incline drops the speed. Heck, a headwind will keep it at 30mph. I've been thinking about doing a small bbk just to help with acceleration and hills. I'm fine with a top speed of 40mph. And i think that's honestly all she's geared for.