Hi there, I have problems with cold start on my two machines, cold I mean under 50 deg. in summer both of them 1-2 squirts, choke on, and starts easy, let's say with about 70 deg. when it drops to 59 deg with second or third shot, but runs OK. HSR 45 mm is in modified 1340 evo, HSR 48mm is in 127" ultima. Both are very good tuned with AFR. While started both are running very good. on 41 deg HSR 45 starts after 4-5 shots, HSR 48 on ultima is starting only one cylinder, after some time, engine get's warm a little, second cylinder is working too. When starting 48mm, I see from first cylinder decompresator goes out lot of fuel, but from the rear one, just a little. but finally i don;t know which one of them is starting, haven't checked it yet. Do You have also same problems with mikuni when it's really cold outside? I always had this problem with japanise bikes, very poor choke on them. When I had S&S Super E in evo1340, it could start even with -4 without problems. caniggia hd-customs.pl is there anything in mikuni hsr carbs to improve choke? il' do after christmas some additional tests, eg close nearley all intake like old choke system were doing, see if it helps.