2000 xc500 non ves. The p.o. put the track extension on it so now it is a 136". I weigh about 220 and had it out today and got her up to 90 on the speedo and the rpms were right at 8000. I know this is about 250 rpms low but for a 500 she really goes. So am I close enough to my rpms, or should I drop a tooth?