are the exhaust pipes in good condition any cracks or holes. does the oil pump work, u can check by running the engine and losening the little bolt ontop oil should come out of here showing that theres oil coming thru and make sure that the cable is working u'll see wen its not.

the bike should run without oil but not for long as it'll probly seize,

just thaught id say itsnot a good idea to have the pump pumping and oil in the tank use either one or the other. but **** best using the pump and making it one of yuor weekly checks that its working and the cables not jammed.

sounds like theres a problen with the induction system such as the carb air coming in after the carb due to damaged gasket or seal.

any help?
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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.