I have an 04 that has been great, never had any probs with it until the past few weeks and I have started having a shifting problem. I can go out and get on it and ride all day and then all of a sudden it doesn't want to shift from reverse to 1st and it will also do it from 1st to 2nd. Other days I go out and it will do it immediately. I just got it out of the shop and they said that they couldn't find anything wrong with it (they didn't tear into it, just rode it). Like I said it comes and goes. As soon as I got home and unloaded it, I couldn't get it out of reverse. I did change from synthetic oil to regular a while back, but other than that all is the same. Any ideas?