Question about 1978 Yamaha XS 650 E
The voltage regulator is a seperate component from the rectifier. If you have checked and replaced most other things, brushes, rectifier and such, then the fault must be in the Regulator asembly. You should check this first with a volt meter, to see what, if any voltage is coming out. A new regulator asembly is very expensive, at about $150 +
There is no need to change out the steel screws on your stator for nylon ones. This does not affect the problem you are having. You need to fit the correct Rectifier, then check for voltage coming from the Regulator, located somewhere near the battery, under the seat or behind one of the plastic side plates.
Posted on Jul 13, 2010
Have you checked the battery for dead cells? Instead of replacing all these parts again, try replacing or at least checking the battery cells to see if any are dead cells. If there is a dead cell in the battery it doesn't matter what you change it will never charge and it will give you the same symptoms of having a bad rectifier or regulator.
Posted on Jul 12, 2010
You will have to go for your model rec/reg and that will help. the new model harness is not supportive to your model.It will not give proper support to control the regulator to regulate the voltage as well as current. the steel screws on your stator is nothing to worry off. Thanks.
Posted on Jul 12, 2010
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Posted on Jan 02, 2017
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