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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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 Posted: Mon Mar 29, 2010 6:57 am Post subject: YFZ450 Blowing oil from overflow. |
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I think this should just be called Ferals troubles.  At least my bike is actually going now but when I went for a ride the other day and on the way home I was going fairly hard and it ended up blowing a fair bit of oil out the overflow thing (little black box near coolant overflow). The oil went all under my left rear guard and the subframe. Any one know why it would be doing this.
The oil isn't overfull either but when the bike has been sitting for a while all the oil runs back from the cannister into the engine. Should there be a one way valve or something that stops this that might be stuffed and would this have anything to do with blowing out oil?
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Quad
The Day Starts With OZATV !
Joined: 22 Oct 2006
Posts: 2773
Location: UP FRONT
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| Posted: Mon Mar 29, 2010 7:45 am Post subject: |
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blow by in the motor, mine gets it , going hard some times, and has to much oil. the piston did not bed in right, pressure risers in the sump and pushers the oil out the top rocker hose to the black box ,down to the swing arm.
new rings lighty hone bore, right level of oil. all good now.
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4stroker
Joined: 15 Jan 2007
Posts: 1420
Location: North Queensland
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| Posted: Mon Mar 29, 2010 9:15 am Post subject: |
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how did you run the engine in?
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2002 SE Banshee |
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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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| Posted: Mon Mar 29, 2010 9:19 am Post subject: |
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Warmed it up for a while and then took it for a run in a ploughed up paddock but not flat out.
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"If in doubt go flat out"
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Clarkie
The Day Starts With OZATV !
Joined: 26 Jan 2009
Posts: 1138
Location: Mildura VIC
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| Posted: Mon Mar 29, 2010 1:05 pm Post subject: |
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Maybee look at who bolted it together and not the bike??????
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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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| Posted: Mon Mar 29, 2010 1:09 pm Post subject: |
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Yeah I think that does have something to do with it Clarkie. Because it was me and Dad that did it all. I'm not rich though and can't afford to pay someone else to do it.
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Mon Mar 29, 2010 1:59 pm Post subject: |
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when you say a fair bit Feral, was there a noticable change in the oil level when you checked it afterwards (presuming you did check it of course) a very small amount of oil can cause a pretty big mess...... it is normal to get a little out the breather if you are going real hard in high temperatures.
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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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| Posted: Mon Mar 29, 2010 4:31 pm Post subject: |
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I checked it about 15 mins after but it didn't seem like that much was gone. All under the guard was comptely covered, the inside of my muffler and grab bar was covered and when I parked it in the shed it was dripping on the ground.
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"If in doubt go flat out"
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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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| Posted: Mon Mar 29, 2010 7:22 pm Post subject: |
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Talked to a mechanic this arvo and he said that I probably just need the rings to bed in a bit more and just take it easy for a while with no high revs and see what happens.
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doorslammer
Roostin Away
Joined: 24 Jul 2007
Posts: 902
Location: Northern WA
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| Posted: Tue Mar 30, 2010 9:32 pm Post subject: |
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| feralkid wrote: | | Warmed it up for a while |
how long is a while, and how was it warmed up?
and when the rings went in the bore did you stagger the gaps?
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01 Banshee
Never take life seriously. Nobody gets out alive anyway |
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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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| Posted: Wed Mar 31, 2010 7:49 pm Post subject: |
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I just started it up and let it sit there for a while while I got my gear on for about 15 mins, then just rode it around a few laps of my drive slow and then for a ride. I'm not sure about the gaps on the rings though. Dad did it one day while I was at school. I'll ask him what he did.
*Asked him and he did stagger the rings.
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"If in doubt go flat out"
"Nothing worth having is easy to get" |
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HaggLE
Roostin Away
Joined: 16 Mar 2009
Posts: 511
Location: Newcastle
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| Posted: Thu Apr 01, 2010 5:03 pm Post subject: |
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Put the hose into a bottle (powerade is good, big opening in the top) and measure it. You shouldnt really get much in there. I could have too big end gap in the rings, not staggered gaps or a slightly bent conrod?
Also, is it coming from the crankcase or the top end breather? Is there a hose on both? |
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mitchel450
4fiddy Racer
Joined: 11 Feb 2008
Posts: 208
Location: At condellos
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| Posted: Sun Apr 04, 2010 10:10 pm Post subject: oil and airbox |
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yeah got 2010yfz450r. didn't even run it in pulled piston straight out, put 1 level up high comp piston and then run it in. and now after 3 10min motos going flat out and pretty warm weather also getting oil in air box. not a whole heap but enough at the end of the day to dribble out the hole in air box and onto swing arm.... bit concerned if this is normal??? probably about 1 to 2 tablespoon of oil ( hard to tell ) and doesn't look like the oil level changes on dipstick.
bike get fresh oil and filter after every race meet. theres no coolant in the oil and bike runs fine. |
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brad0080
Blaster class
Joined: 24 May 2008
Posts: 157
Location: Newcastle
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| Posted: Mon Apr 05, 2010 6:56 am Post subject: |
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| yeah I have an 2009 YFZ450r. After riding hard the same thing happens. oil in the air box. Bike has about 35 hours on it. |
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dangerman4
Roostin Away
Joined: 31 Mar 2007
Posts: 854
Location: Morphett Vale
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| Posted: Mon Apr 05, 2010 9:25 am Post subject: |
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i am of the opinion that a fresh brand new engine you shouldnt let it idle.
especially seeing your first startup is when the rings first get a chance to bed into the bore. 10 seconds maybe but not 15 minutes.
im thinking a new set of rings is on the cards feral.
and the only way the rings will change by running it for longer like your mechanic said is if you throw a cap full of cutting compound in your fuel tank.
the damage is done, and a fresh set of rings should cost the earth. |
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doorslammer
Roostin Away
Joined: 24 Jul 2007
Posts: 902
Location: Northern WA
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| Posted: Mon Apr 05, 2010 11:47 am Post subject: |
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| dangerman4 wrote: | i am of the opinion that a fresh brand new engine you shouldnt let it idle.
especially seeing your first startup is when the rings first get a chance to bed into the bore. 10 seconds maybe but not 15 minutes.
im thinking a new set of rings is on the cards feral.
and the only way the rings will change by running it for longer like your mechanic said is if you throw a cap full of cutting compound in your fuel tank.
the damage is done, and a fresh set of rings should cost the earth. |
i was thinking along the same lines, let if idle for 10 15 seconds to get oil pressure up, then bring the R's up to at least 2000-2500
cant you buy a fuel additive that helps stop the glazing? if you can put some of that in and run it hard
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Never take life seriously. Nobody gets out alive anyway |
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HaggLE
Roostin Away
Joined: 16 Mar 2009
Posts: 511
Location: Newcastle
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| Posted: Mon Apr 05, 2010 4:29 pm Post subject: |
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Sounds to me that there is a design problem with the engine.
I think that the rings are probably fine but the breather is not big enough so it pumps oil out.
To settle this you will need to get the rings off the piston, put them back in the bore and measure the end gap. If the gap is too large then thats the cause, if its ok then dont worry about it. |
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mitchel450
4fiddy Racer
Joined: 11 Feb 2008
Posts: 208
Location: At condellos
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| Posted: Mon Apr 05, 2010 7:49 pm Post subject: oil and airbox |
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| If ring gap to big, wouldnt the bike be using heaps oil and blowing smoke? |
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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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| Posted: Mon Apr 05, 2010 8:04 pm Post subject: |
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Well i have just been cruising around for a the last few hours I have done on it, probably about 2 or 3 hours just to try and give the rings a chance to bed and I went out today and did a bit of moto x at the local track which was fairly high revs and then I give it a thrashing when I rode home to see if it was still blowing oil and none at all came out not even any in to the airbox so I'm happy now.
Get my new tyres and it will be ready for TP300.
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breno213
Roostin Away
Joined: 16 May 2007
Posts: 749
Location: South Australia
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| Posted: Mon Apr 05, 2010 9:26 pm Post subject: hi |
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sounds like you over filled it how much oil did you put in ,if you over fill it it will push it out
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elmerkit
90cc 2 stroke / 110 4 stroke
Joined: 13 Apr 2010
Posts: 60
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| Posted: Tue Apr 13, 2010 5:21 pm Post subject: |
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I think it over filled or under filled, just a question how do you ride your atv? do keep constant speed? for a certain rpm or driving just like you stole it? May be the oil is coming from the breather hose. try to trace it.
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WestAussie
50cc nipper
Joined: 12 Oct 2009
Posts: 33
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| Posted: Fri Aug 20, 2010 9:54 pm Post subject: |
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its common, my yfz has been doing it since i had it, never had any dramas, i wouldnt stress about it
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azza450
4fiddy Racer
Joined: 31 Mar 2006
Posts: 211
Location: Drysdale, Victoria
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| Posted: Sat Aug 21, 2010 9:16 am Post subject: |
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| Just ride it, worry about rebuilds if it gets smokey or is down on power, at least you will never have to buy chain lube. |
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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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| Posted: Sat Aug 21, 2010 2:05 pm Post subject: |
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Hasn't done it since, will just remember to take it easy for a bit after the next rebuild.
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"If in doubt go flat out"
"Nothing worth having is easy to get" |
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mike_6r4
90cc 2 stroke / 110 4 stroke
Joined: 04 Aug 2010
Posts: 58
Location: Melbourne
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| Posted: Sat Aug 21, 2010 11:06 pm Post subject: |
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I race speedway, grasstrack & flat track. In normal races of 4 laps of a 500M track I never had any oil blow out. When I raced in Germany earlier this year the races were 4 laps of a 1,860M track and this included one section where I was at WOT for 28 seconds. It was blowing out oil, it looked like loads over the swingarm but didn;t make a difference to the dipstick reading. Then at a normal race a month after there was no oil.
It's usually sustained high RPM that causes it. |
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