sounds like the clutch isnt djusted properly and dragging alittle id freewheel in neutral and then kick it into second.

have yo tried opening the drain on the carb to let some petrol run through as sounds like maybe your floats are a little stuck.

is your battry low on charge?
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Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.