what year is your 450f? i have an 08 and the manual that comes with it is like a service manual, i will take a look and see if it tells me and let you know.
nytro
yamahaviper,
sorry for the delay, i looked in my manual and it doen't give any jet spesc. other stock. give a try over at www.thumpertalk.com someone there can proly help.
nytro
