Fix-it kit?

[amorti]

Hi all,
I have noticed my Divvy (late 96 on a P, it has an oil cooler) has this problem. All on the lovely new slabs my housemate/landlord laid in our front garden.

There are three topics in this forum on this, and it seems consensus is to wash out the airbox and blow the pipes through half-yearly or so. That's fine, but what is this kit (as above) and how/where does it fit, and does it work? If a tenner and five minutes splicing tubes will fix this permanently, I'd much prefer that than finding it's gunked up again by means of spotting a brown puddle under the bike.

I'm half - tempted to run the pipe round into the loobman or put some other kind of catch-pan under it so that even if it does it I can empty that out other than over the front yard.

Would it be a really silly idea to just run that vent into the crankcase breather so the oil drips back down into the sump? I half-reckon that's what the part shown above is for anyway?

[amorti]

I had the bike a bit apart today (tank, fairing lowers and airbox off) for the traditional new (to me) bike inspection. The usual stuff; looking for anything suspicious, and a bit of a clean of the bits you don't normally see.

I had a go at this leaking problem, too. There's a tube from the rocker cover to the little connector that vents into the airbox and a big pipe back down to the crankcase. I cleaned that lot. I found the big one was gungy and slightly kinked, so turned it upside down Eventually I might get a braided hose for there so it can't do it again.

We'll have to see if there's a puddle under my bike in the morning - fingers crossed.

But back to the point - what's the actual cure for this?

The rocker cover and crankcase tubes vent into the airbox as gases that would otherwise cause excess pressure in the crankcase are vented there, into the carbs to be burnt. So both of those breathers are to vent gas into the airbox, and any oil that gets out the rocker cover should flow back down to the crankcase.

The airbox then has a drain tube which is the one that leaks emulsified oil. Oil shouldn't ever get into the airbox to be able to get out there anyway. Then again, the airbox is also sealed from water by the filter, and there's a drain hole in the middle of the filter housing for any water that did find its way in.

So the long and short of it is that drain tube isn't really needed. The only thing it could drain is engine oil that shouldn't be in the airbox anyway, but in the crankcase. Why not run it into the fat crankcase breather pipe, to drain back into the crankcase? Is condensation forming in the airbox either during a ride or overnight such a problem that it would preclude this solution?

If it is still leaking in the next couple of days, I think that's what I'm going to do. Can't see why not, and it'd solve the puddle problem.

Only other thing I can think of is not to vent into the airbox, but into one of those little k and n filters they make for just this purpose. But I can't see there's space to put it high enough that it wouldn't just clog with oil.

Sorry, I got to rambling there, didn't I.

[General Gman]

No problem with rambling.... I think the problem with venting back to the crankcase is that the gunge that is formed in the breather tubes is an emulsion formed from oil and water condensates.Probably best not to have that bobbing around in the crankcase where it could get lodged in an oilway somewhere.I found that caning the bike so it ran nice and hot and cleaning the breathers regularly solved it for me.Gawd knows where theose 'fixit' bit sgo - I assume the screw is to eliminate the breather from the cam cover, dunno about the plastic elbow.
S'pose you could always rig up a red bull can to catch any muck from the drain tube in a race bike stylee

[amorti]

Well after cleaning it at the weekend, my bike appears to have become housebroken, so now gets to live on the hard standing with the house's other 3 bikes. Must've been the shame of wetting the bed

I think eliminating the top breather is a bad plan, as any condensation will clear through evaporation, where it will only go up. If it can't get out at the top, it won't probably bother getting out at all.

Meh, I think I'll just keep an eye on it (or wait til housemate has to tell me off) and keep it cleared out, it's not too hard to get at, if a bit of a PITA. If it's only half annually or so then should be when it wants a proper clean anyway.

[amorti]

216.37.204.206/wps/Yamaha_OEM/YamahaMC.asp?Type=13&A=234&B=8

Just been having a look at the fiches on this site. They all show the breather arranged as shown - no mention of that odd little arrangement my bike has. Does the bike not require a breather from the rocker cover, then?

See part 19