I have a 97 indy 500 and it seems like it loading up when I first take off then it comes out of it. After riding for about 30 minutes and stopping when I try to take off it just lugs down and doesn't make any power at all. Ive tried to pull the choke and that doesn't help at all. if and when I fianlly get going it comes right out of it and pulls great. around 4 grand it comes into it.