I need help with my 350x...not running right

[gaukel350x]

I bought my 350x with a full supertrapp system and it has 8 discs and the stock jet was in it. it ran lean so I put a 145 in it and I took it out to superstition in california and it was sucking balls it was barely making it up hills and it ran wierd can anyone tell me what I need to do to get top performance out of it and it has a k&n on it too

[Bo0YaA]

I was having jetting issues as well and was reffered to the Jetting 101 sticky and it got me pretty damn close to perfect just following the info there.