a proper clean of the carbs and the petcock supply making sure you do not have a vacuum lock because of a clogged petcock/filter is the likely solution. Here are some carb links for the 83 550 and similar carbs.these should help a lot. be particularly aware of vacuum leaks, intake boot leaks (both up and downstream of the carbs), and note that changes in the flow (removal of arirbox, or change from airbox to individual carbs can make significant differences. test to see if you are getting fueal to each cylinder by carnking withkill switch in off position and inspecting the plags to see if they are wet. and yes the 550sc was only in the US in '83, some canada models were also delivered in 84. http://nighthawk-forums.com/index.php/topic,2961.0 http://nighthawk-forums.com/index.php/topic,4472.0 http://forums.sohc4.net/index.php?topic=63342.0 http://www.ch250.net/techtips/19.htm
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