Oil Leak/Blow By - Help!
Dec 26, 2005 | 09:34 PM
#1
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Pro Rider
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Oil Leak/Blow By - Help!
I have a lot of really black sooty oil collecting around the starter/case vent area. It does not look like engine oil, it is almost powdery. At first I thought that it was a leak in the case vent tube, but after examination it looks to be in good shape. There was a grey piece of tubing coming form the case shoved inside the larger black one running up under the tank. There was no clamp, should there be a hose clamp on this connection?
All this began after getting my intake ported. I decided to remove the air box at this same time in order to mount the battery up under the seat. I routed the vent hose back up under the tank plastic, and there was none of this oil anywhere but around the starter/case vent areas, none up high on the bike, the only other place there was oil was around the starter. I snugged up the bolts on the starter but still had the leak. Is there a gasket or o-ring on the starter that could be the problem? The bike was running a little lean and hot at idle after the upgrades, a larger pilot fixed that, but during my initial tuning it was nearly 100 degrees outside. I was thinking if there was an o-ring or gasket in the starter, and because it is very close to the headers, could the o-ring/gasket have melted? Would there be thick black blow by oil coming out of the starter oriface?
I was also thinking that because there is no vacume pressure on the vent after removing the airbox and snorkels that case pressure would purge the excess vapor and oil out of the next easiest place, would that be the starter? I think that this may provide the necessary vacume for the case to vent properly.
My next step is to try to incorporate some of OldManRacing's stock carb mods for the balance tube and slide. Then I can route the case vent tube to the spot on the snorkle between the carb and filter where the balance tube had originally been to create the vacume that would pull vapor/oil back into the engine.
Any thoughts or criticism is greatly appreciated.
All this began after getting my intake ported. I decided to remove the air box at this same time in order to mount the battery up under the seat. I routed the vent hose back up under the tank plastic, and there was none of this oil anywhere but around the starter/case vent areas, none up high on the bike, the only other place there was oil was around the starter. I snugged up the bolts on the starter but still had the leak. Is there a gasket or o-ring on the starter that could be the problem? The bike was running a little lean and hot at idle after the upgrades, a larger pilot fixed that, but during my initial tuning it was nearly 100 degrees outside. I was thinking if there was an o-ring or gasket in the starter, and because it is very close to the headers, could the o-ring/gasket have melted? Would there be thick black blow by oil coming out of the starter oriface?
I was also thinking that because there is no vacume pressure on the vent after removing the airbox and snorkels that case pressure would purge the excess vapor and oil out of the next easiest place, would that be the starter? I think that this may provide the necessary vacume for the case to vent properly.
My next step is to try to incorporate some of OldManRacing's stock carb mods for the balance tube and slide. Then I can route the case vent tube to the spot on the snorkle between the carb and filter where the balance tube had originally been to create the vacume that would pull vapor/oil back into the engine.
Any thoughts or criticism is greatly appreciated.
Dec 27, 2005 | 11:59 AM
#3
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Joined: Jul 2002
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Oil Leak/Blow By - Help!
Yes there is an o-ring on the starter and NO, you couldn't have melted it. It could be worn but, that would be wet oil coming out of there.
If the black oil stuff is powdery it sounds like it is an exhaust leak. Check your pipes. Do you have gaskets in your exhaust? (Should be little copper ones that go into the head before your header pipe is put in.
If the black oil stuff is powdery it sounds like it is an exhaust leak. Check your pipes. Do you have gaskets in your exhaust? (Should be little copper ones that go into the head before your header pipe is put in.
