Vitos Piston Jetting

[blacksheep399]

i am running T-5 pipes k&n filter and vforce reads on my shee with lid on airbox and i was running 280 main and needle clip in 3 groove and 25 pilot (toomey jetkit) at sea level and the bike was running great now i put a set of vitos superstock pistons and a 4 degree key should i go up a size or two to cause of the pistons and key or could i stay with the jetting i had before. i cant do a wot run because i havent broken in yet . does someone have similar setup that can tell me what there are running? or can someone give some advice?

Thanks

[MotulMonsta]

I have a similar setup. When I installed Vito's power pistons, my bike ran rich, I had to jet down. Before I rebuilt, I was running pro-x pistons. run your premix rich at about 16:1, idle the bike with the choke on for a minute, then check the plugs, if they are not dripping wet, you need to run richer for brake in.Then start the bike back up and run it for another minute the same way. alow the bike time to cool. Then put the bike around at idle with the choke on for about five minutes After you run about a gallon of 16:1 at idle and LOW throttle run your regular mix with the choke on then check the plugs. They should read rich.Now run it with the choke off. You can open up the throttle to 1/4 of the way and blip it occasionaly to clean up the plugs. After you run about a 1/2 a tank like this you can run it harder. after you run the other half it's time to jet. Get new plugs as the one in there will be fouled. Your bike will be race ready in a day or two.