When I bought my 1998 440, I got it in August. It was running so rich it would not make enough power to load on the trailer. Mine was jetted rich even for winter, in the summer it couldn't even move. Dropping the e-clip at least gave me a lean enough mix that I could load it.
And you may want to try RJ's advice, if you have a plug that is fouled, it will do the same thing... new plugs, jet it a bit leaner, it should at least be able to move

__________________
2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008

04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php