Oily air filter

What would cause that then? My bike smells like it's running rich so I
whipped the AF out and it's like oily inside; not slimey like actual oil
but it's not dusty iykwim.

Also, why would I have oil coming from the crank case breather pipe?

 

Nothing to worry about: how old is the filter?

Because - and this may surprise you - the crankcase is full of oil
fumes, due to being half-full of oil being flung about all over the
place and being fucking hot at the same time. That's why you have a
crankcase breather: to extract said fume and breathe it into the
engine where it is burned off.

 

In uk.rec.motorcycles, wessie amazed us all with this pearl of wisdom:

I did check the oil level actually, I topped it up the other day by a
guess amount and there's a couple of millimeters over the max on the
dippo sticko - That would explain the oil in the crank case breather
pipe but not the air filter; the filter's not wet with oil but has the
appearence of having filtered oily smoke iyswim.

What's the consensous on those cone shaped jobs, like K+N style filters,
one for each carb type efforts?

 

In uk.rec.motorcycles, Pip amazed us all with this pearl of wisdom:

I changed it about 5,000-6,000 miles ago. The crud's not knockable, it's
really needs a replacement.

Ohhh, well I did rather cane the **** out of my bike today.

The fucking bitch deserved it, too.

 

This is usually caused by modification of the standard bodywork causing
unplanned eddy currents in the air box region, which will be exacerbated
by using reduced length silencers which rob the engine of vital back
pressure causing non optimum swirl characteristics in the head during
the exhaust stroke, resulting in an oil vapour mixture being forced back
through the carburettor into the air box.

HTH

 

Get them nice and oily, and then **** the shit out of them.

HTH

 

If your filter was oily from the engine breather, I'd expect it to look
black and oily on the outside, which it didn't. The filter is black on
the inside, coz it's sucking London air in from the outside through
those little intakes. Just replace it and stop being such a pikey.

 

In uk.rec.motorcycles, Muck amazed us all with this pearl of wisdom:

I'm going to replace it, you mong. I just don't know why the filter
looks like that. The one that was in it when I got it was like that and
it didn't live in London then.

I want to get a K+N for it but what do you think of these?

http://www.knfilters.com/universal/universal.htm

Obviously I'll only need four but I was talking more of the style.

 

Whinging Courier wrote

I like the truncated cones. If you have the right sized hole so that
they fill it nice they look really cool. Especially the short ones.

 

They look fab to me. Can you get them in a waterproof design so that
one can grow flowers inside them?

 

Or, "Mr. Honda knows a damn sight more about making motorcycles than
you do - you've shafted it, and I don't mean you got rid of the chain."

 

In uk.rec.motorcycles, steve auvache amazed us all with this pearl of
wisdom:

I need to measure the carb opening. I know the throttle bodies are
38.5mm but that's not much good if I want the filters to bung on the air
side. I'm in agreement with you though, I reckon they look good and will
look pretty spiffy without the standard airbox in the way.

 

Whinging Courier wrote

Look good certainly but will your bike start and run after?

 

Be prepared for many hours of carb fiddling, or many £££ on a dyno, if
you fit those. Even then it'll most likely never run right. The airbox
does a lot more than just hold the air filter.

 

Matt black paint makes it worse, because it absorbs heat and overheats
the oil, producing more mist.

 

Worst case is piston blow-by. Yer bores/rings are shagged, matey.

Or it might simply be too much oil.

 

Yes, and one of the other jobs it does is provide support for the outer
ends of the carbs. Many shagged intake rubbers die an early death
because of the entire carb weight being on them.

 

In uk.rec.motorcycles, steve auvache amazed us all with this pearl of
wisdom:

Of course. I've stabbed at least 200 holes in the AF that's in it now
and it runs sweet as a nut.

 

In uk.rec.motorcycles, Grimly Curmudgeon amazed us all with this pearl
of wisdom:

Good point, I never thought of that.

 

Whinging Courier wrote

Go the whole hog then dispense with the filters and put on some carbon
trumpets.