Idles but won`t accelerate

Hello, bike not running off of choke is an indication that the pilot circuit in the carbs is plugged.. the choke is a enriching circuit hence why it runs only with the choke on. When turned off the bike starves for fuel and dies. My guess is the bike has sat for longer than 4 months and the pilot jets are plugged from varnish... they will need to be removed and properly cleaned.

Sounds like it has sat for some time, if so then the jets in the carbs are clogged and need to be cleaned out. You could try running some carb cleaning gas treatment, it might work if the jets are not completely blocked. It may take 3 or 4 tanks to clear them.
MGM

if the diaphram is in poor condition as you say, it will need a new one.
if there is an air leak though the diaphram it can cause the symptoms you describe

recheck the carburator/s main jets, blow them out with compressed air, they could be blocked.
Hope this helps!

sync 'ing the carbs you need either a manometer or two vacuum GAUGES. pREFERABLY A MANONMETER..iT'S A MATTER OF BALANCING THE CARBS TO HAVE THE SAME VACUUM AT THE SAME POINT OF THROTTLE OPENING.. WHAT IS YOUR LOCATION?

vacuum opens the fuel tank petcock. The carbs have thier own means ofmetering fuel in the yhemselves. So, I'd say the carbs need to be pulled and cleaned, all jets should be cleared of corrosion and float levels ck'd if equiped. good luck.

have u cleaned the reed valve out?

hello and welcome
this is a very very commom problem after the cycle has gone over a storage period of anything over a month or so. what has happened is the deteriorated fuel has plugged the idle jet, and possibley other jetting. this is verified by pulling out the choke allows it to run. because this makes of for the loss of fuel the jets are not produceing. so to fix this you will need to remove the carbs and take out the jets and clean them thoroughly with a carb cleaner and possibly a very small gauge wire to break up builup. especially in the pilot jet. unfortunately fuel added carb cleaners dont seem to work for this kind of problem and to fix right they should be disassembled and cleaned thoroughly. thank you.

this is very tipical. when bikes are stored the fuel varishes up the jets & needles. soak the carb. moving it back and forth in the soak solution. then blow every jet and orfice with a controlled air source. note: any speck of rust or dirt can plug these jets. pay attention to detail and do every thing twice. then install the carb and adjust it to your riding style. later Spike