I have 2005 Derbi Atlantis 50 cc. Has 200 klm. Has 70 cc kit and pipe. Seems choke never stops even when bike is warmed up. Auto choke appears not to work. Removed choke and put 12.6 v DC from other battery to it. Piston gradually moved out as it should. Problem seems to be that the 12.6 volts that my bike is putting to this auto choke is AC not DC. I checked yellow wire to rear brake light and it is also 12.6 v AC not DC. Never seen anything like this. Is voltage regulator malfunctioning or is something else wrong? Thanks

SOURCE: cooling system

Probably if you change the whole engine. Remove the cooling system and replace the cylinder and head for ones with air vanes on. But that would probably cost nearly as much as a new scooter.,

SOURCE: wiring problem gilera sc 125 motorbike (derbi gpr 125)

Wrap the wire round the Ht lead two or three times, it induces a signal to the Rev Counte, the wire does not have to be bare or connected to anyting other than wrapped around the lead..

SOURCE: What is the spark plug gap for a 2005 Derbi Atlantis 50cc?

Gap the plug at .028 to .031.

SOURCE: i have just bought my 16 year old son a 2005 derbi

switch is ussually next to horn or on the left of the throttle
there should be a rider light on anyways
its below a red button from what pics iv seen

SOURCE: just got a derbi gp 50 rr and it clicks on the

Try charging the battery to the fullest, it surely is a battery problem. The horn and lights might work fine on the low battery, but the starter doesnot. Moreover, since it was unused for a long time, I'd recommend to change the battery.