I picked up a 1998 Evinrude 6 2 stroke for use on my refurbished 12' gamefisher. The guy I bought it from says it was serviced about 6 mos ago and hasn't been run since. I had to replace the plugs to get it to start and now it will only run when choked or revved all the way up. Am I looking at a fuel pump or a carb issue? If it is a carb issue can i clean the ports on this motor by only removing the bottom cup of the carb or do I need to remove the whole thing? Thanks in advance for any insight.