devon.john, thamks for that. Loads of info on Carbs. on there.
MadMax, you get an adjustable needle in the kit so can't go down the Sporty Needle route.
MadMax and Scotty, you are both confirming what I originally thought: 48 seems a big jump from the stock size 45 but that was the info. given by Andrews in the Cam Instructions as a starting point.
I will get myself a #46 jet just in case. Do Pilot jets come in increments of 1, if so I will get a #46 and #47 while i'm at the shop?
Thanks for info fellas...Pat