I went for a ride with my son today in upstate NY, near Ithaca. It was quite warm, around upper 40's. No problem when I first started out, although uphill it was bogging from 4000-5000 rpm. When I got it up to over 5500 rpm it ran fine. The bogging got noticeably worse further into the ride. After about 1 1/4 hrs, it was all I could do to get uphill. The engine is completely stock, never had any problems yet, 5700 miles. I always use premium fuel. I did put an Xtra-10 suspension under it last year, but I have used it a lot this year and no problems until today. Could the warm temps have anything to do with it? My son was riding a 440 fan cooled super sport, and he had no problems the entire day.