CBR250RR doesn't heat up

[Ender EnZed]

Most bikes of this era barely register on the temp gauge unless in stop start traffic( no air flow), you thrash it or there is a problem.

This.^^

From your description (getting just past the "C" symbol, then little further) it sounds like it's behaving normally.

If you really want to see the needle go up and check that the fan works then go for a decent ride and leave it running when you stop. That'll get it hot.

[DuCKy!]

Cheers guys!
Great fun to ride... definitely different to the 9krpm on my S2k

[avgas]

seriously tho leaving you bike on its sidestand and warming up is not good for it think about how the oil is flowing around your engine on its side and barely pumping over the cams

Come again? Wet sump and a mechanical pump. You should have the correct amount of oil through the engine at the complete rev range. You need less oil at lower revs - so a mechanical pump will run slower. Likewise because its a wet sump - you should have the oil intakes complete covered at all times, so pump doesn't run dry. This means that even with half (or worse) a tank/sump of oil - the intake should still be saturated.

[hayd3n]

Come again? Wet sump and a mechanical pump. You should have the correct amount of oil through the engine at the complete rev range. You need less oil at lower revs - so a mechanical pump will run slower. Likewise because its a wet sump - you should have the oil intakes complete covered at all times, so pump doesn't run dry. This means that even with half (or worse) a tank/sump of oil - the intake should still be saturated.

think how liquids flow, it will always take the easiest path so the high side will receive less lubrication up top whilst idling on its side-stand

[The Reibz]

think how liquids flow, it will always take the easiest path so the high side will receive less lubrication up top whilst idling on its side-stand

The oil (fed to the head) is inside a constant pressure fed system usually fed by a gear driven pump. All parts should be equally lubricated unless the oil pump pickup is not submerged in oil.
Having the engine on a incline will take slightly longer for the pressure to build up but it is nothing to be worried about. My falcon has noisy tappets until about 10 seconds after startup which is when the oil pressure is built up. Busa also has a light tap from the head on the first couple of engine cycles on startup.

As for the CBR temperature issue, I won't worry unless that needle was on the other end of the gauge

[avgas]

think how liquids flow, it will always take the easiest path so the high side will receive less lubrication up top whilst idling on its side-stand

To add what Reibz has already said. The oil loop is designed to coat every part of the engine with the bare minimum amount of oil. So provided you don't leave it on the side stand idling for a good 3-4 hours you should be fine, as the minimum amount of oil will cover what it needs to cover. After 4 hours idling on the side stand, it might start getting a bit dry. But even then I would be a little surprised.

They got pretty smart with engine design over the last 50 or so years. Even see a nissan motor running sideways to operate some crazy belt driven thing. So while they core of how a piston engine hasn't really changed - oil distribution and other funky elements certainly have.

[ducatilover]

Always warm one up, you cannot ride a tiny 4 cyl without revving fuck off it (try keep one under 3000rpm, even in town). Seriously. Why do you think the bastards explode so much? Cold riding eats them.

It will fuel like poo until it has a wee bit of heat any way

The oil does get to the cams, don't be silly, it is force fed to the journals. I can have my Kawasaki sitting for a year on the side stand, pull the rocker cover and it still has oil on the lobes/lifters on number four.



The temp gauge on an MC22 should sit around a quarter. Buy a new fan switch too, because it's easier than having a 20+ year old switch shit itself, and in turn your engine.

[ducatilover]

My falcon has noisy tappets until about 10 seconds after startup which is when the oil pressure is built up.

That, good chap, is because Coons glaze the lifter feeds and it takes longer to get the right volume of oil in the bastards.