stick this in the nsr discusion forum.

what condition is the air filter in and how do you know its unrestricted? imports are restricted electronicaly depending on the country it was imported from. others are restricted by a plate in the inlet manifold between the rubber and the reeds its got a small hole in it restricting the flow of mixture. and others have a washer in the exhaust that you can drill out and make smooth.

does the valve work on the engine side ie move on the engine side when you rev high? the cables degrade on the 125's and can get stuck.

wha oil have you been putting in? u should use the best 2t injector oil yu can find and make suer no waters in it.

have you changed the spark plug? should be first thing you try?

does the choke fully disengage on the carb side? take the choke out and check its movment on the cable?
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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.