probably worn brushes in the generator, ez to replace about 15.00$
Hi, Either bad charging system or battery. Check battery voltage itself and then voltage to battery with engine running. Healthy charging system will put out 1.5 to 2.0 volts above battery voltage. Motorcycles are notoriously rough on batteries. Peace, crigby
If you use NGK plugs BPR7ES or BPR7EIX the gap is 0.032. Safe riding!
You probably have a bad alternator or a battery that is really bad, have the charging system checked out.
Defective voltage regulator which is built into the alternator. You need to have your charging system checked. You should read from 13.5 to 15.5 volts at the battery with the engine idling. Very much more and the voltage regulator is defective.
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.
yes the only difference is the ignitions
Suggest you call a Yamaha dealer for info.
20w/50
Mid 1980's