cyclocrossfool
XS400 Enthusiast
bought a 1979 xs 400f2 a week ago. she starts and sort of runs, but throttle must be on full. after a few seconds she quits. the battery is new and charged, we have gas. there is spark to both cyclinders, the plugs look good and have the correct gap,the air filters are clean. no obstructions to carbs. took the bowls off carbs, cleaned w/ carb cleaner and some air in jets, took top off. slides, needles, rubber on dia all good. butterfly and cable linkage all seem to work good. the engine has a little over 8000 miles. things a havent checked are compression and timing. the points look in great shape. no oil leaks in engine. oil changed. old oil looked great.i think thats it. it seems like we have gas and air. am i missing something??? i need help, thanks, CXF