we are working on a mid nineties blaster and it is bogging real bad we dont know much about this quad as my buddy just bought it we changed the needle jet up on (its in the second from the top now) but it still runs like crap it kinda sounds like a four stroke does anyone know what else we can try

 

1st check the compression to see what shape the rings are in, then if it still has the stock pipe check to see if the baffle may be clogged by taking the pipe off and running water through it.