Where do I start?

[ZachBreck]

2005 Special Edition, K&N with pro flow, FMF Pipes,(the next is all new) Dune Port, bored .40 over, Noss Head with 21CC Domes. I was running 280s prior to the port, bore, and Head with domes. I am just looking for a guess as where to start the jetting, maybe 320 ish? Any suggestions???

[sredish]

it's all up in the air when the porting is changed. a dune port from one person is not equal to a dune port from someone else. you could need a 320 with one port and 350 with another. if you needed a 280 previously, try going to a 330 and see what happens. you could have a need to go richer but maybe not.

[OnlyA2Stroke]

I just received my cylinders back from RB Racing and I was very pleased. It was a choice for FAST, Herr Jugs, & RB Racing. FAST was behind, so I went with RB Racing because of the customer service, satisfied HQ members & price. I had the cylinders honed for my STD Wiseco Pro Lites & Aggress Dune Port. I almost have the same setup except the bore and I tried 360 & 350 but the plugs were real wet. I am at 340 mains now & going ride a bit tomorrow. So I would start high and work your way down from a 360 or 350.