Hi Kymco Forum, this is my first post. Very good info here, this is just the first time I've been stumped on any Kymco (I work at a Kymco shop too
) I have a B&W 250 that I got for $100, rebuilt everything, new crank MRP 300cc top end, Naraku cam and a lot more. The issue is this: the coolant slowly gets ejected out of the radiator into the reserve bottle. It's not extremely fast but it will overflow the reserve after an extended period of driving, if I went 100 miles without draining the bottle and refilling the radiator it would spill out the reservoir. I've replaced all the coolant hoses, checked the clamps, tried two different new radiator caps, drained and re-filled coolant multiple times always making sure to bleed from the bubble hose and at the radiator. When I got the scooter I rebuild the pump seals and gasket, no leaks what-so-ever. I am baffled at this, and have resorted to using a syringe to refill the radiator once or twice a week at this point. A lot of people on different forums I read say headgasket for this type of problem but this top end has maybe 2000 miles on it, all properly torqued to spec. If anyone has ran into this, or know any special bleeding procedure for the 250 L/c motors chime in, thanks.