you have the wrong emulsion tube and i question whether you should have a 185MJ in there? i would have thought a 195? now in the 7 years i've been a member, i've never jetted a bike up.....
first time for everything.
you need a DR272 and while you're there you may want to check your PJ. this should be a 33, or 35 or a 38Pj maximum. i also recommend a #40 choke jet. i would look at that K51 really closely but get one of those as well.
if you're choking at the bottom end i suggest that you check the correct TDC and get that sorted as per the doc and a load of photos i put in there last week. no excuses from now on.
also sooty at the bottom and can mean impending doom with the SEM....
i don't have a float valve and seat but if i can help - call me! i don't think in a month of sundays that this is your problem. just chack the floats look even from the back and not just the side like everyone does. you're looking for twist as well as level.
regards
Taffy