OK, I've got an '86 XL600R that I'm restoring. This has the old two-carb set up and I'm trying to dial them in. I've put an aftermarket pipe on it from Al Bakers but their jetting advise was kinda limited. What I've done so far: Increased the pilot jet from a 63 to a 65 on the primary carb, increased both the main jets from 15 and 18 to 25.5 and 27.5 and raised both needles with 1/2 mm shims. Here's how it's performing: a little weak still on the bottom, fantastic mid-range and popping on the top. Any suggestions would be greatly appreciated.