Kev
XS400 Member
Newby here but have rebuilt a couple old bikes but this has me stumped. 1979 XS400. Left plug perfect, right plug shows rich. Starts great when cold and runs down the road good, although I have only put on 4 miles. I have two questions. One, when starting cold on choke if I blip the throttle hard the revs will climb hard until I reduce choke. Second, w hen idling (1200 rpm) it will occasionally "hiccup" and then quit. It starts right back up but eventually will hiccup and quit again. Carbs cleaned and sync'd, pilot screws out 1 1/4 turns. Where do I go from here?