Oil pressure switch

[fazersharp]

[quote author=limax2 link=topic=24849.msg290508#msg290508 date=1547325316]
[quote author=BBROWN1664 link=topic=24849.msg290453#msg290453 date=1547244272]
[quote author=limax2 link=topic=24849.msg290450#msg290450 date=1547242969]
No body has mentioned that when the oil is warm it will have expanded and therefore higher in the window than when cold.
Must admit I've never noticed the difference and anyway my light has never come on so I don't get concerned about it.
I still change the oil at approx 4,000 miles and check the level now and again, but have never had to top it up between oil changes. Bike now done about 55k.
Doesn't take much oil from first appearing in the window to going beyond the top, so a bit of care required at the final stages of filling.[size=78%]  [/size]

Expansion will be minimal. So ignore it.
Oil will be up around the top of the engine when warm rather than all in the sump. This is why it is LOWER in the window when warm and why the manual says to check it when WARM
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The reason to wait a few minutes after warming up is so that most of that oil drains back into the sump.
Just for interest the increase in volume is :-
Volumetric expansion coefficient of engine oil is 0.00070 per deg C
Oil capacity say 2.7ltrs = 2,700c.c.
Lets say temperature difference from cold to warm is 40 deg C
Change in oil volume = 0.00070 x 2700 x 40 = 75.6c.c.
To use a previous measuring scale that’s about three normal egg cups worth.
I’ve no idea what that difference in volume represents in terms of height in the site glass and never bothered about it. Maybe I’ll have to check the oil level when cold and then again when warm after standing a few minutes and see if my calculation theory is total garbidge. 
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Been a while for my bike now but from memory when my bike was cold the oil was above the window.
[/quote]Yes it is or very near the top.