1988 Jawa 210 2 speed all stock except for newly mounted sha 14/12 and an extra hole drilled out in the baffle.
It only idle with the choke on, and will not start w/o it. even warmed up.
Cleaned the gas tank, petcock, new fuel line, cleaned the carb extensively. tried a 52 jet, 54 jet, 56 jet.
new spark plug b6hs .5 mm Gap, new boot. has spark.
stock sha mesh air filter and cover.
Adjusted the timing to spec.
50:1 gas/oil ratio.
checked for air leaks.
tried every possible turn of the mixture screw.
Gonna go nuts fiddling with this machine. (edited)