Wednesday, May 26, 2010
As printed in the 1980 Honda NC50 ('77-'82) Express NA50 Express II ('79-'81) Shop Manual by American Honda Motor Co. Page 26-1, you should use 10W-40 Motor Oil.
The Honda Scooter nc 50 has a Transmission Oil Capacity of 0.75 lit. (0.79 U.S. qt.) (25.28 U.S. oz.) that should be filled with 10W-40 Motor Oil.
Do NOT use 2 stroke oil and do not use 10w-40 lubrication oil in your Honda Moped Oil Tank.