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Old 10-22-2012, 07:20 AM   #16
Bill Harris
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Quote:
Originally Posted by Voltaire View Post
snip

eventually found the culprit....



had a sort of bodged silicon gasket....
The breather valve is set up wrong. Align the new breather so that the reed valve opens facing "10:30 o'clock" ("12:00 o'clock" being straight ahead pointing to the front of the bike).

--Bill
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Old 10-22-2012, 01:11 PM   #17
pkboxer
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Breather - 10:30?

Bill, is this one facing 6 o'clock according to your description?

What is the reason for 10:30?
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Old 10-22-2012, 01:57 PM   #18
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Originally Posted by pommie john View Post
i guess, but a leak down test would be better.
+1
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Old 10-22-2012, 03:19 PM   #19
Voltaire
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Originally Posted by immaculata View Post
Got a feeling my clutch has copped some oil too. I wasn't riding but my mate that was said it felt like the clutch was slipping.... great!
Don't be tempted by Brake Clean....I was....it worked but not for long.....getting quite fast at gear box pulling now
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Old 10-23-2012, 05:32 AM   #20
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Originally Posted by immaculata View Post
But why would this happen? How can i trouble shoot this?

I've pulled the plugs thinking Rings but they look perfect.

Any ideas?
Have you ever had this before? How did your friend rev the engine?

There are engines that throw oil at high revs, others don't do it.
Cause could be tolerances in the cast of the crankcases.
Hartmut Lohmann (www.lohmann-tuning.de) modifies the cases in the area of the back main bearing (where the oil channel is coming from the left side) to allow better oil flow downwards between the crank and the case.
Otherwise it may be pumped upwards into the breather entry, which is located on the left side.

My experience:
My first engine could be reved up to 8k and kept there for minutes (thanks to the german Autobahn) without pumping any oil. I checked the catch tank after 10,000km and found only dust.
The second engine was built on a used R100GS base. Keeping revs up resulted in pumping oil like on Voltaire's image.
My current engine was built with a new crankcase, modified by H.Lohmann. No pumping at all.
It's a pity I can't compare the before/after effect directly.

A friend had the same problem with his R100GS ever since he bought the bike.
He had the case modified, but at the same time changed to a new piston/barrel set. No pumping any more.
So again no direct before/after comparison possible.
But my personal conclusion is it works.
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Old 10-26-2012, 08:30 PM   #21
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Well, i couldn't get my hands on a leak down tester so i decided to pull the heads to make sure the rings were ok. A little extreem but it's all i could think of and i was pretty sure i was going to find an issue.

NO, the rings are prefect and the barrels look mint too.

What else can i check? The reed valve looks as expected and the drain back hole seems clear.

Perhaps i should just put it back together, build a catch can and see what happens next (after cleaning the clutch)

Maybe it was his riding style?


Any other ideas???
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Old 10-26-2012, 08:31 PM   #22
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Originally Posted by Voltaire View Post
Don't be tempted by Brake Clean....I was....it worked but not for long.....getting quite fast at gear box pulling now
Thanks for the tip.

I guess gearbox pulling is my next lesson in BMW maintenance!
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Old 10-27-2012, 04:09 AM   #23
pommie john
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I'm not sure you can check the rings just by pulling the heads off. If you've got the barrells off have you checked the ring gap?

If you've got that far I would put new rings in anyway.
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