I have had my Hayabusa running a few times from I got the engine back into it but only for a few minutes in the garage, don’t want to take it out on the road as no MOT and waiting on my map sensor coming before it goes for MOT. When I look at the oil level the new oil is 100% transparent now when I run it for a few minutes the oil looks very cloudy I would go as far to say like milk!!

Then I go back and look at in 10 minutes and its transparent again.

So today I drained a cup full of oil to see if it had any water in it and its 100% oil (No Water)
Has anyone else ever seen this? Please tell me you have!!!!

Kind regards

possibly a little bit of condensation! keep running the engine and it should all eventually clear the system, had something very similar with a few engines.

if it persists i would dig deeper....

I have been told the additives in Bike only oil are stop foaming particularly from the clutch and gearbox. Have you got a bike oil in it?

R1's suffer from condensation in the crankcase if starting/stopping without getting the oil hot. That results in cloudy oil. It clears with a good run. I'd guess your BUSA is the same

Thanks for the replies, it has got motorbike oil in it, but it's just cheap oil as I have changed it 3 times from I put the engine back in, I have been changing the oil as when the core plug popped out the sump was full of water as was the cooling system full of oil! Just going have to wait to get some mot on it. Then I can go and cut a few mm of the rear tyres !!

If it's had coolant in the oil then there's probably going to be plenty of condensation for a while after. At least until it's had a good run and got the oil well above 100c.

If you search back far enough you'll find me asking the same question after my first few engine runs. Had a proper panic but the engine has now done 6 years.

[Edited on 2/4/14 by adithorp]

Could be air in the oil if you have overfilled and the crank is thrashing through the oil?

No not over filled. I will be getting to give it a good run on sat after its been to the MOT, so that will tell the full story.