just wondering if anyone can shed any light on my issue. I've just bought this bike as a project i has a flat spot at about 1500 to about 2000rpm. i believe its been bored out to 810cc has a lazer can and K@N filter. i know for a fact that this bike has been dynojet at some point by the previous owner. From reading the printout i have. The 1st run there was hickup in the power curve up to 4000rpm for the 2nd run :- 120 mains, needle grv 4(no Spacer) idle 3.5 turns out. this had seem to fixed the power delivery to 400rpm. but its still ropey to 2000rpm