I have the same carbs on a shee I just bought. I called Trinity and got their jetting specs. They sell a 28mm PWK settup, and use a 155 main, 55 pilots, and a JJH needle. He said the needle is the whole key to this settup. I ordered the whole set from them for $35. That is for sea level. I am at 1700 feet so I got 150 mains and 50 pilots.