My 05 took a dump yesterday on my Birthday of all days. Was out with my little guy cruising it started to surge badly and locked up solid. Not sure at this point what it could be. Guess is SC or dropped a valve but who knows until I can get into it tonight and take a look. What a piss off mid summer! On a brighter note I just got a 3 seater spark last Friday which is an awesome machine. If I can dump my RXP after fixing I'll be having another Spark.