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Odor vapors of oil

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rpaul:
Hi everyone,
I feel that when I pull the engine to 5-6-7,000 rpm, in the subsequent deceleration phase, I feel a smell rising from the bike, which looks like "oil vapors" from the engine, given the mileage above 130k, that the bike generates a lot of oil vapor is normal, but these vapors should be "eaten" by the engine itself, directly from the vents in the filter box !! could it be that for some strange reason the air makes them rise towards the pilot?
First of all the smell is unpleasant and in addition I think it is also harmful / carcinogenic, so I was wondering if, 1st: does it happen to someone else? and 2nd: if you have any idea how to eliminate it ??
Thanks in advance to anyone who answers me!

S Barker:

Are you sure it's not coming from chain oil dripping onto the exhaust ?

rpaul:

--- Quote from: S Barker on August 25, 2020, 10:57:38 PM ---
Are you sure it's not coming from chain oil dripping onto the exhaust ?

--- End quote ---

Hi S Barker, thanks for your reply!
If it were chain oil on the mufflers, you should feel more when stationary or going slowly, not at more than 100Km / h like it happens to me!
It is as if when the engine turns strongly, closing the throttle, the vapors that are no longer sucked in by the engine are shot towards me from under the handlebar.
It is very evident how the phenomenon appears and disappears when the accelerator is closed and opened.
The question is why? How can I avoid it ??
Thank you all!!!

John J:
Your description seems to suggest a lot of crankcase pressure. I would start by looking in the air filter box to see how much oil is in there, a little can be normal but a lot could mean high crankcase pressure. The high mileage of your bike may mean the piston rings / cylinders are worn a bit which can cause high crankcase pressure.

rpaul:

--- Quote from: John J on August 27, 2020, 06:00:30 AM ---Your description seems to suggest a lot of crankcase pressure. I would start by looking in the air filter box to see how much oil is in there, a little can be normal but a lot could mean high crankcase pressure. The high mileage of your bike may mean the piston rings / cylinders are worn a bit which can cause high crankcase pressure.

--- End quote ---

Hello John,
thanks for your answer!
I think you are right, the filter box due to inconvenience, I haven't opened it yet, but if I take a long trip, when I stop from the vents near the stand 2/3 drops of oil always fall, following the tube, I think is the air filter box breather.
Obviously, the bike with the displacement it has and its power in performance is not noticed that the bands are not tight, but I think that is the only possible explanation.
Is there anyone else who has so many kilometers and has similar problems? Or other bikes of the same km are fine?
At this point, what do you recommend to do? Making a new engine costs as much as the used bike or maybe more!
Since the bike is running relatively well, is there no way to just eliminate the smell?
Thanks a lot to everyone!

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