I recently purchased a 2001 660 and it has now developed an engine miss from 1/4 throttle and higher. I have read the discussions about the park break problems. The park break had been removed when I purchased the bike , so I presume it was done correctly. It starts no problem and idles good, but when I increase the rev it stutters, misses, small back fire through the carbs and the engine sometimes stops. I have also read there may be other sensors on the engine that may cause the same symptoms as the park brake issues. Can you tell me what they are, where they are, and how do I check if they are faulty. Do I just disconnect them or do I have to ground the wires after disconnection? I have had the head off, the rings, piston, valves and cam timing are all OK. I have been through the carbies twice and all looked OK. Thanks in advance.