Regarding the fact that after a long ride the idle jumped up, you may want to check the carb holders for leaks. If they develop tiny cracks in the mating surfaces between the holders and the cylinder head they can cause that symptom. These cracks cannot be seen with the carb holders in place. I suggest you try the following. Get the engine warmed up and temporarily set the idle as low as possible without killing the engine. The lower the better because with the idle very low the slides are about shut and the vacuum inside the carb holders is at its highest. Then spray carb cleaner around the carb holders, especially where they mate with the cylinder head and where the carbs attach to them. If the engine dies or seems to react to the carb cleaner, you need to replace the carb holders. Bad carb holders can cause some erratic symptoms because the amount that they leak can vary as they get hot. The problems are noticeable at idle but generally don't have much impact when riding because the throttle is open. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
