I have a 07 wr450f and I made it street legal and I do 50 to 55 some times and when I do the bike hesatates like I'm hiting the brakes then letting off really fast it really small jerks but I can feel it. And idk what it is but it does stay at 55. Doesn't lose speed but I jerks alittle and I can feel it done many thing to fix it but can't figure it out. Please help. Thanks.