Oil dilution

Just changed the oil in my bandit 250 last night. When I filled the crank last
oil change I filled it to the "F" mark on the window. Over 2500 km, the level
went up quite a bit. When I drained the oil, 3.3L cameout. The oil didn't
smell like petrol but it was runnier than the clean oil I filled it with (GTX3).
I usually ride 15km each way to work, and go for a 30 to 50km ride every
weekend. Would the oil thinning be caused by dilution or moisture absorbtion?

I've checked the crank vent hose, it's clamped securly, so I'm pretty confident
water didn't go in through here.

Any thoughts?

thanks.

 

Chances are when you filled it perhaps the bike wasn't quite level or on
it's side a bit. Sump oil is generally thinner than fresh oil as the polymer
chains have been broken down and the oil is starting to degrade and also it
tends to be a bit warm when you're draining it out, hence being thinner than
cold fresh oil.

How does 3.3L compare to what you put in? it doesn't mean much unless we've
got some kind of comparison. I extremely doubt there should be any dilution
(dilution from what I cannot think!) or moisture absorbtion as it seems to
ride the bike enough to get the oil temp up to burn off any condensation
etc. Any other volatile chemicals like petrol etc would have evaporated.

Other than that .. hmmph, who knows. You sure it gained oil???

Cam
'03 954

 

Water in oil will make the oil creamy, like, well, cream. fuel in oil will
make the oil thin, smell like fuel A LOT and the other telltale will give a
'burn' feeling on the wrist if dabbed on, like a solvent. non-diluted oil
won't do this.

Primay culprit is the floats- one of the carbs is allowing fuel through that
it shouldn't. turn the fuel tap off at night and see if that fixes it.

otherwise make sure the fuel tap diaphragm isn't burst or the hose from the
fuel tap to the manifold (the vacuum line, a small diameter hose), or the
smog fitment (if any still in place) isn't filling the sump via the
manifold. I don't think there is anything particularly wierd about the fuel
system on them. But I still go with the floats- bet you have a float stuck.
its a carb-off job to clean them properly. Have fun!

Chris

 

If water got into it go milky white.

and if fuel was mixed in with it, well they don't mix, so it be sitting
ontop of the oil or below the oil.. and probably wouldn't change the
viscosity.

Hope that heps crack ho

www.mad-biker.com

 

My experience says brown.

Petrol and oil don't mix? So what the **** am I putting into my
whipper-snipper then? And what is that pre-mix stuff they sell in
cans?

Theo

 

well that's 2 stroke, designed to mix

 

and it does separate, that why you have to shake the crap out of it before
using it again..

 

any oil will dilute in petrol- if it didn't you'd have mayhem on your hands.

oil will go milky white with water, and if the oil has some carbon (eg
older) a brownish. but still shitty looking.

check that fuel system- it can happen anytime!



Chris

 

Eh? Can you explain this to me? Degradation products will decrease
viscosity or is that temperature?

Hammo

PS does it matter if I'm not using synthetic oil, I wont have any polymes to
break down, right?

 

"Mad-Biker.com Mad-Biker.com>" wrote

Only if you leave it for a few weeks. There is a small chance it will
be mixed just a little inside a crankcase.

And would you believe that three litres of oil mixed with one litre of
petrol smells like oil, not petrol.

Theo

 

I knew there was something wrong with you of late, you bloody petrol
sniffer!

Hammo