Float height=23mm,(0.906+-0.02 in) idle speed1100rpm.
The float level on a 1980 Yamaha YZ50 should be set to approximately 16 mm when the carburetor is inverted. This measurement ensures the proper fuel level in the float chamber for optimal engine performance. It's always a good idea to consult the specific service manual for your model for the most accurate specifications.
there is no such bike yz490 didn't start till 1982 and went on to 1990 before this it was a 465 ....
17.00 HP (12.4 kW)) @ 7500 RPM according to manufacturer specs for 1980
The Specs was created in 1980.
Dead Man's Float - 1980 is rated/received certificates of: Australia:G
21.4mm or .84" from the float bowl mating surface to the top of the float
The Yamaha 850 XS is an air cooled bike. There is no radiator to fill.
If you are talking about the 1980 Yamaha Enticer, the top speed would be 55mph.
133.6 MPH
On a Yamaha 1980 XS400 the valve clearance for the inlet valve should be 0.0003 inches. The valve clearance for the exhaust should be 0.006 inches.
Suggest you call a Yamaha dealer for info.
yes the only difference is the ignitions