I just purchased a Greenbee JS500 used which is almost identical to the XB600 and i need some help!
I bought the scooter used and thought the batteries just needed to be replaced because it lacked power, but after purchasing new batteries the scooter still maxed out at 20kmh wich i think is only 12mph.Even when i lift the bike up and max out on the throttle is still tops out at 20kmh. The specs on my bike are 48v 20ah battery with a 500watt hub motor.Here is the link http://www.greenbeeusa.com/js500.html If anybody could tell me what they think it is or if they know anywhere i could take it up here in northern california(SAN JOSE) to be exact to get it fixed. Thanks Joe
500 watts isn't very powerful but should be able to do 20 miles/hr. However I do have an electric bicycle with 800 watt motor that only does 14-15 miles/hr. It wasn't clear from their website whether they have a storefront you could go to and whether they offer service.
Have you called up the seller? What have they done to help?
Have you measured the battery voltage? What made you think it was batteries?
What kind of batteries shipped with the bike? What kind do you have now?
How big is Big?
Rider weight, tire pressure, wind, pavement condition and slope, and the state of battery charge all affect the speed.
But, you said you lift the bike and it tops out (unloaded) at 12 mph, which would seem abnormal. The dealer web site says 30 mph, right?
There must be something limiting the speed (or the speedometer). Might the rpm-sensor be double-pulsing, fooling the controller into thinking it is going 24 mph?
Is there a max speed adjustment in the controller that somebody turned down for their kid to ride?
Do these bikes have a 20-mph limiter to be "legal" in some places?
A loose or unconnected wire is probably a good clue.
An alarm system?
Or, an alarm that was supposed to sound "loudly" if the bike was moved?
There might be more to the alarm system, hidden elsewhere, that is slowly "sucking" power?
The alarm / system probably does not use much power, but its "normal" job might be to interfere with the proper operation of the scooter.
Also, it probably draws power all day and night and slowly drains the battery, possibly ruining the battery.
Can you determine what was controling this "alarm"?
I know there was some discussion on here with those of us that have the XB600 about some gray wires underneath the dash cover under the gauges. Supposedly on some brands of these those gray wires connected or disconnected (can't recall which) cause it to be speed limited. It didn't affect my XB600...but you might check that. Of course the person you bought it from would have had to do something with that and seems would have told you if they did???