Riding my 100o rt last a couple of weekends ago and after taking a break for a couple of minutes started it up and would only pull 7000 rpm's for say 1/4 mile. pumped throttle a couple times with no response over 7000. Shut if off and immediatly restarted and pulled right back to 8000 when I took off. Did not think much about it ran good all day. Last weekend during a hard day of riding did same exact thing, took a break started it up and 7000 rpm's, shut it down and restarted, right back to 8000. Runs great, but got me a little nervous. any help?