Got a '80 with the bs34 carbs, brass floats.
originally set them to 27.3mm, went through carb tuning procedure outlined here:
http://www.factorypro.com/tech/tech_tuning_procedures/tuning_carbtune,CV,lower_rpm_engines.html
running 132.5 main jets, giving me good pull at >2500 rpms. non-adjustable needle clips.
step 3 in that link is adjusting float height. 27.3mm was too rich. when i cruise at 1500-2000 rpms, then all at once open it to full throttle, the bike sputters and pops. did this around the block, check spark plugs and they were black. thats why i figure float height needs to increase. this problem goes away when i increase my initial cruising rpm. ex. if im cruising at 2100 rpms, then i give it full throttle, i get a nice pull and i go faster.
i increased the float height to 29.3mm and it is still the same thing. at this point i moved on to mixture screw and syncing, then i set idle speed. so as of right now, this seems to be my only problem with the carbs (cleaned and checked all components).
(not very concerned about this problem because 1/2 to 3/4 throttle at any rpm works, so the bike is still very rideable.)
TOO LONG; DIDNT READ: 27.3mm = bad, 29.3mm = still bad.
should i keep increasing the float height? when would increasing become unreasonable (32mm? 35mm? etc.). also, does anyone have any tips for adjusting float height with minimum hassle?
fully removing the carbs from the bike is a pain. i appreciate any and all help guys
originally set them to 27.3mm, went through carb tuning procedure outlined here:
http://www.factorypro.com/tech/tech_tuning_procedures/tuning_carbtune,CV,lower_rpm_engines.html
running 132.5 main jets, giving me good pull at >2500 rpms. non-adjustable needle clips.
step 3 in that link is adjusting float height. 27.3mm was too rich. when i cruise at 1500-2000 rpms, then all at once open it to full throttle, the bike sputters and pops. did this around the block, check spark plugs and they were black. thats why i figure float height needs to increase. this problem goes away when i increase my initial cruising rpm. ex. if im cruising at 2100 rpms, then i give it full throttle, i get a nice pull and i go faster.
i increased the float height to 29.3mm and it is still the same thing. at this point i moved on to mixture screw and syncing, then i set idle speed. so as of right now, this seems to be my only problem with the carbs (cleaned and checked all components).
(not very concerned about this problem because 1/2 to 3/4 throttle at any rpm works, so the bike is still very rideable.)
TOO LONG; DIDNT READ: 27.3mm = bad, 29.3mm = still bad.
should i keep increasing the float height? when would increasing become unreasonable (32mm? 35mm? etc.). also, does anyone have any tips for adjusting float height with minimum hassle?
fully removing the carbs from the bike is a pain. i appreciate any and all help guys