My 2007 Honda 919 has 5k on it and looks in mint condition.
Back in October I did an oil change and filter replacement. Nothing out of the ordinary and the oil was pretty clean.
The bike was put in cold storage a couple of days later as I was leaving for the next 3-1/2 months.
As soon as I got back (a couple of weeks ago), I started using the bike again for my daily commute. Nothing unusual until last night when I checked the oil level (which I do about every week) and noticed a white residue on top of the oil (through the little window at bottom of crankcase). I checked again this morning after getting at work and noticed a thick layer of what looks like white foam on top of the oil. After thinking about this for a while and talking to a couple of co-workers, it appears that it is most likely coolant in the oil. I checked the coolant reservoir, and indeed the level is lower than the minimum line (was fine back in October).
By the way, I looked but did not see any smoke or steam coming out of the exhaust.
So, I'm afraid that is probably what it is.
This engine has only 5000 miles on it! Ugh...
So, my questions are:
- Do you agree with my prognosis?
- What are the possibilities in terms of the source of the problem? Other than a blown head gasket?
- How involved is this for a repair?
- If it is a blown head gasket, is it possible that the head might have gotten damaged?
- What's the best approach to find the fault? I mean, I don't want to take the whole engine out if I don't have to.
Taking the above literally, I see about 0.001 % chance of it being coolant getting into the oil.
If the drained oil was OK, how could fresh oil suddenly being seeing water ?
Head gaskets generally let go under higher engine temps, not cooler engine temps, and not at or near start up.
If you did not have adequate strength antifreeze, and you garage temp was low enough to cause freezing, you could have cracked a water jacket in a place that ultimately leads to the oil sump.
Anyway, my guess is that it's nothing more than blow-by condensation from the water component of the combustion products.
(If you were using inappropriate oil, standing foam could have been a result and that would sit at the top)
Blow-by condensation will result is some degree of an emulsion that will also sit on top of the oil.
Get the oil out and have a look at it.
Find out whether there really is an issue or not.
Excessive water/glycol content will be visible, but will sink to the bottom.
Take an oil sample in for analysis if you see the need, even if just for comfort, it's cheap, $ 20 -30 depending where you are.
At present, 110% of your focus should be on determining what you are seeing in the oil.
You either have coolant in it, or you don't.
Determine that first.
Save the angst for later truly knowing you have a coolant contamination issue.