Got an interesting project. I found a hidden treasure. Its an 83 XL600R with only 1,900 original miles on it. Stored in a garage for many years. After a complete carb(s) cleaning, tank flush, new battery and tune-up it starts right up. However at constant throttle settings the motor tends to surge and if i idle it down to low at motor will quit without warning. Anyone out there have any suggestions as to what to look for next? Or any knowledge of "quirks" of this particular model? THANKS!