I have recently rebuilt from top to bottom a Yam XS500C, 1977 vintage.
The engine was totally stripped down and rebuilt step by step - I'd better point out here that I'm not a mechanic, I just take my time, follow the books and use a bit of 'common'
The bike started on second push of the starter button - it's not running right , but I can work on the carbs and timing later.
The major problem is that the oil pressure light stays on when running - Not good!!
The 'book' says turn off the engine immediately, trace and rectify the fault - that's it
I've tested the pressure switch - remove, compressed air blown in, multimeter to check circuit breaks when under pressure - all OK
The correct amount of oil had been added (about 4ltrs with a dry engine)
So what do I do next??
I am presuming the oil pump is working as the tacho drive works - they are both driven by the same shaft - and checking the pump is a last resort as the engine has to be totally stripped down to remove it - and I did check that all was working when I assembled the engine.
So, where do I start as a 'first resort' ????? Can anyone help and point me in the right direction, things to look for or check??
Top and bottom of it is - the last thing I want to do is remove the engine - so what can I do before I have to do the last thing I want to do - are you following this
Hope someone can help me please