My bike starts up OK but If I drive for a while it conks out and will not start until it cools down again. There is no spark until it cools down. I put in a new ignition pick up coil, but it did not help. The bike is a 500cc model but is the same as a 550 cc. Back in the 80s the tax was cheaper for engine sizes under 500cc here in Finland. So they sized down the engine a bit for Finland.