Hi JW,
- Have you considered a DynoJet kit for your bike?
- From what you said about the needle clip position, I would guess that the stock needle has already been removed.
- A step up on the pilot will likely be necessary. The 50 with 1.5 to 2 turns out probably good.
- A 170 from a 138...that is a HUGE jump on the main.
- No doubt the flow mod you have done will require a major step up. The biggest change is the open air filter. You mean like K&N or you went full on open cell foam type filter?
- You must have a good job to afford all that gas your bike is gonna start consuming.
- You will need an assortment of jets to find the correct one. To just say "Oh Yeah, a 170 will be perfect" just isn't realistic. Jetting is a trial and error process that some find fun and others frustrating.