Foamy

Hi, im new here and im haveing the same problem with my 2005 kvf 700 .wont rev out.act like the rev limiter.tryed new fuel pump, had carbs cleaned did belt reset.new belt.checked belt switch inside cover.im in the process of trying another coil and maybe speed sensor.if anyone could reply if they had this problem and have fixed it.process of elimination is getting expensive.thanks