all the sudden- running too rich
11K miles ago I did all the carb mods, running great, no problems. The day after a normal 100 mile loop (gravel and dirt roads, with pavement to get me there), when I started my bike it stumbled, started missing and died 100 yards from my driveway. I pulled the body work and checked the plug, it looked great, good spark. The Uni air filter was clean (and just cleaned), So I checked fuel flow,checked all vacuum lines and vents, pulled and cleaned the carb, triple checking everything, diaphram good, was no dirt in the carb but I really cleaned it, set float at 17.5mm, so carb should be good, drained and put in new gas. Inside tank screen clear and clean. Pulled coil, inspected cap and wires/ground. after each of these steps, the enginge would start and idle for 30 seconds ok, but any throttle will make it miss and hesitate, If it goes above 3000 rpms, black smoke from the exhaust, the new plug will not be wet, but is covered black soot. Why is it running so rich? What am I missing?
Last edited by Shaun; 11-06-2011 at 08:37 PM.