My 99 Yamaha SX200TXRX surges. During throttle up, at about half throttle, it dies to about idol speed, then immediately regains power and speed, then dies again, etc. I noticed that the fuel level in the cup, which is attached to the engine, is just full enough to reach the filter portion of the filter element. The cup is not completely full, does it need to be? It appears that fuel is not reaching the exit point at the top of the cup assembly. If this condition is not normal, can you suggest a troubleshooting method? Thanks.
