Yes, try it, should tell you if your roughness is rich or lean. There all different. My '07 runs awesome on what would foul my '03. And yes, have RBD cut the head. RBD also does carb mods that have excellent reviews. I beleive he cuts the slide to an #8 and works from there as part of the package.
The latest LTR needles should be richer in the straight section than previous that were indeed lean.
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