saxo vtr engine clunking noise

  1. #1
    Hi guys I've got a problem with my autograss
    race car I've got a saxo vtr engine in pug 106
    when I start it up its fine leave it at idle its fine as
    soon as I rev it its making a very loud clunking
    noise as soon as carb is half way open it don't do
    it then it will idle as normal butt keeps doin it as
    soon as I rev it any help would be great thanks