I think your pilot is big. Try a 42.The main is close, I ran a 152, in the stocker, with no lid, no snork., full LRD. I am at 5000ft.

 

Hey sam, I just got home from the shop and I forgot to check the dyno computer for the jetting specs on a stk, with T-4 KFX400, sry.
I'm going to the shop tomorrow so I'll check then.
Ray

 

What slip-on?

Anyway, try 155 and 25 pilot.

 

homemade

 

Samcods,
I'm runnin a White Bros E-series, a K&N w/intake adapter kit and dynajet kit. Its been a while so I'll do my best here... If memory serves me correctly, the Dynajet kits largest jet is 150 and that was way too small. I put a Kehin 155 main, I used the dynajet needle with the clip in the 4th position (open 4) and kept the stock pilot. The jet needle still had plenty of adjustment on it so there is no need to change the pilot. I started lean and worked my way up in incriments of 5 until I got where i am. A 150 Kehin main lost power on top. The 155 was the magic touch that made it roost.
Your slip-on may have more back pressure then the e-series so you may have to go down on the main, maybe 140 - 145. I have to say, just the pipe and air filter mod gave the thing a crapload more power and to go from 130 to 155 pretty well tells the story. This thing is jetted spot on for 1000' and below.
Hope it helps

 

Buy a DYNOJET stage 1 and 2 kit ($50.00).It has jet sizes up to 155 and has instructions on which jets to use as well as turns on the airscrew for just about every combination and altitude.......

 

Hey Sam, I finally remembered to check the dyno computer. It was a 155 main I ended up with. I shimmed the needle (I think it was 0.020")
made 32.98 rwhp best (I made 11 runs, customer wanted to see 33) made 32.37-32.98. LOL
Set air screw for good idle. try to run it a little rich at idle, it helps with low rpm throttle response.
Ray