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XS500C - Oil warning light stays on - need guidance


misteroe
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I have recently rebuilt from top to bottom a Yam XS500C, 1977 vintage. :D

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' :o

The bike started on second push of the starter button - :D 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 :angry: - Not good!!

The 'book' says turn off the engine immediately, trace and rectify the fault - that's it :unsure:

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 :blush:

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Could be many things, but first thing I would look at are all the gaskets that have oil passages in them to make sure one did not get flipped, blocking an oil passage.

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Thanks Houghmade - will do the checks on gaskets as I gradually strip the engine down to find the fault :thumb:

Bit of an update though - thought I'd check the compression again to check the 'poor running' problem. The results were intersting:

Right cylinder 140psi :thumb: just as it should be according to the manual.

Left cylinder 105psi :thumbdown: way off what it should be!! I rechecked both cylinders, twice, with the same result.

There's loads of questions I could ask but I'll stick to topic, so .....

:icon_question: Could the low compression on the left cylinder contribute to, or even cause, the oil warning light to stay on?

Just trying to narrow down the problem, anyone any thoughts? :(

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