F4 MY10 Blowing out oil - MVAgusta.net
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post #1 of 11 (permalink) Old 07-16-2012, 05:42 AM Thread Starter
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Question F4 MY10 Blowing out oil

Have any of you guys had this problem on the Y10 F4's ? I mean blowing oil into the airbox through the breather, when used on the track.
Obvioulsy not on my bike but on the bike that used to be raced over East and it's now in Perth.
I will suggest the guys look into a Leakdown test, and also waterpump seals, but that's all i have atm.
Thanks in advance for your help.

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post #2 of 11 (permalink) Old 07-16-2012, 10:05 AM
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Oil type too thin? ring seal poor? breather hose routed wrong? I got nothing....tell him to quit holding it a gear low on that short straight and go ahead and shift...or change final gearing so he doesn't have to over-rev when a change up is required but not efficient.

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post #3 of 11 (permalink) Old 07-16-2012, 10:22 AM Thread Starter
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Originally Posted by esq'z me View Post
Oil type too thin? ring seal poor? breather hose routed wrong? I got nothing....tell him to quit holding it a gear low on that short straight and go ahead and shift...or change final gearing so he doesn't have to over-rev when a change up is required but not efficient.
Oil is one thing in question Ed, I will have a look at the bike myself pretty soon and see if I can find something.

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post #4 of 11 (permalink) Old 07-16-2012, 07:33 PM
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post #5 of 11 (permalink) Old 07-16-2012, 08:06 PM
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Wink oiler?

pull the oil separator.....there is nothing in it

now put 2 stainless ChoreBoy pot scrubbers in it....I capped the airbox and put a PCV filter on the tube coming out of the separator

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post #6 of 11 (permalink) Old 07-16-2012, 08:38 PM Thread Starter
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pull the oil separator.....there is nothing in it

now put 2 stainless ChoreBoy pot scrubbers in it....I capped the airbox and put a PCV filter on the tube coming out of the separator
You've got a Y10 F4 - .
I have not had chance to look at the bike Noel, but from what I was told a similar patch was already in place, but not with much success.

I will see if I can figure out in the W/shop manual where the breather pipe comes out from on these motors.

Trying to figure out if this is a common problem on the new bikes, or a once of on this motor?

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post #7 of 11 (permalink) Old 07-17-2012, 08:59 PM
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Wink

Donsy:
l4 motors don't breath much......because the crankcase volume doesn't change much,
that said the crank isn't knife edged and it does not appear that the cases have an 'oil scraper' either
the reverse rotation crank will want to throw oil at the breather area

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post #8 of 11 (permalink) Old 07-17-2012, 11:47 PM Thread Starter
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Donsy:
l4 motors don't breath much......because the crankcase volume doesn't change much,
that said the crank isn't knife edged and it does not appear that the cases have an 'oil scraper' either
the reverse rotation crank will want to throw oil at the breather area
Thanks Noel. I was hoping someone else might have had the some problem on the new bikes, but not getting much back from anybody. It would be a bit sad if that fairley new motor was building up crank pressure for other more expensive reason's.
The guys seem to think the bike suck's the oil through when they shut the throttle from high rev's, the thinking is the breather in the airbox is close to #1 inlet trumpet, and this might cause enough suction to get the oil up there ?

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post #9 of 11 (permalink) Old 07-19-2012, 06:00 PM
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Wink ?

Donsy;
manifold vacuum is high when closing the throttles at high rpm......
but airfow in the airbox is about zero, the throttles are closed.

they didn't think about that one

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post #10 of 11 (permalink) Old 07-20-2012, 02:01 AM
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Quote:
Originally Posted by Donsy View Post
Have any of you guys had this problem on the Y10 F4's ? I mean blowing oil into the airbox through the breather, when used on the track.
Obvioulsy not on my bike but on the bike that used to be raced over East and it's now in Perth.
I will suggest the guys look into a Leakdown test, and also waterpump seals, but that's all i have atm.
Thanks in advance for your help.

Yup common as muck, sustained high rpm and prolonged time at a set throttle will fill the air box with oil. The crank case pressure has to go somewhere. I did loads of stuff 8 years ago or more on ktm engines and sorting crank breathing due to removing the balance shaft which contained the breather pick up. Anyway, long story short. I put a breather in the side of the cam chain tunnel quite high up so in theory out of oil flow. After only a few minutes the oil had bled the air out of the breather and created a vacuum. I've never seen an engine actually empty itself of oil before but this one did. It was like a hoover mate, just started filling this massive tube I hade fitted and then into a catch tank. So not uncommon at all.

I notice it on th dyno mostly but I do see it in race bikes.

It's not just an MV issue, I be had all sorts do it so don't really worry about it.

Check oil level is slightly below max level and also the grade of oil. I use 15/50 as it wont get quite so viscious and hopefully not fill th air box.
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