I never tried a 19, I felt like I lost too much low end grunt with an 18 on my 790. I settled on a 17 as compromise because the stock 16 was too buzzy highway speeds.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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