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Post by amorti on Mar 17, 2009 21:58:17 GMT
You will have to pull the thing out and look, but dont go down to a smaller bore size as that is the same as having emulsion gunk partly clogging the standard tube. The problem isn't the emulsion clogging it, it's it kinking at the top under the tank. Sorry mate no idea the length offhand.
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Post by hornblower on Mar 21, 2009 13:47:11 GMT
Hi all, new to the site and new to my little Divvy 600. I have noticed this oil leak from the breather hose that everyone seems to of had!!! I'm not being lazy and its not a problem i will be able to do the work, but i was just wondering if anyone has ever measured the length of hose to replace the old one with? If so could someone please post? Its just i can have a bit of braided hose made up at work for free!!! I'm not being a tart!!!ITS FREE!!! LOL... Look forward to hearing from you. Changed mine last week and the old one was still sitting in the shed (it might come in useful one day...). Just measured it and it's 14 inches long. But it isn't difficult to take off and check the measurement.
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Post by stustan64 on Apr 1, 2009 14:20:40 GMT
So just carried out the work, and taken it for a test ride (about 80km) parked her up and no oil leaking from the breather hose!!! About time!!! So in answer to my own question the length of hose used was approx 14inches! It took me about 40 minutes to complete the job and i'm not really the best at this sort of thing but with help from here and my trusty Haynes manual i got there!!!
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Post by paprika on Apr 3, 2009 10:25:33 GMT
Just like to thank contributors to this thread.. I have just had this problem and with a quick search here, about 25 mins of scraping the skin off my fingers , a swift attack on the (unfashionably yellow) garden hose, all is well. No more nasty dripping from my breather pipe. So thanks.
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Post by amorti on Apr 3, 2009 16:44:23 GMT
Thanks, I feel vindicated
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Post by CD on Apr 6, 2009 10:41:57 GMT
I still think that nasty little 1/4" pipe from the front cam cover is a big part of the sludge problem. It gets chilled by the airflow and any steam condenses into the Tee under the airbox. The 900 has a similar front rocker hose but its shorter and goes directly into the airbox so any gunk is less likely to collect and it wont affect the main breather.
On the 600, a fatter hose from the front rocker cover might help. It could also be "insulated" with length of garden hose slipped over.
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Post by amorti on Apr 6, 2009 22:49:43 GMT
CD, why are you still second-guessing and propagating misinformation? You must realise you're flogging a dead horse with all these theories, when the problem is resolved. Here's a thread on another forum where a few more members have given my fix (which doesn't really cost anything and is easy to do) a go, and quelle surprise, it's resolved the problem. Like I posted that it would on here months ago. www.bikersoracle.com/yamahadiversion/forum/showthread.php?t=1420Short and sweet: replace the main hose with a piece of garden hose. The little one? Remove it, leave it, insulate it, colour it in pink?? - whatever. It's secondary to the problem. Yes that's how the oil gets into the airbox, but think about why and where the pressure that forces the oil up is coming from. You're effectively suggesting bailing out the kitchen as a good way to fix a leaky water pipe. I took that little pipe off as it was split anyway. It's primarily there to help cold running (carb icing) by channelling hot air off the engine into the airbox. My bike suffers carb icing (lots of or maybe all divvys do) so draw your own conclusions. If you really want to fit a bigger piece of pipe here, do it with the hope of reducing carb icing. And I don't see how it would work as you are limited by the stub bolt diameter, which is <6mm and so not adequate. If I had mod privileges I'd lock this thread before anyone else comes along with their own little untested guesses to confuse people.
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Post by CD on Apr 8, 2009 9:19:00 GMT
I'm sure the better hose stops it clogging up and fixes the symptom. No worries about that. 8)
I'm not saying don't do it, but does it stop the moisture condensing in the first place?
So many seem to have suffered with rusty clutch release bearings it looks like the engine ventillation is marginal at best. A fatter and insulated small hose to the front rocker WITH a decent main breather pipe has to be the way to get the best we can from the system.
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jon
Newbie
Posts: 8
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Post by jon on Jun 4, 2009 11:41:53 GMT
There is an official modification from Yamaha to fix this specific problem. it removes the hose from the top op the camshaft cover to the 'T' piece joiner. I got mine from Flitwick Motorcycles for about £15 and it has never done it since. Sorry but i cant remember the official part number for the kit, but i am sure any dealer would know about it.
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Post by CD on Jun 4, 2009 11:49:20 GMT
Why not cut the hose in the middle somewhere and block the ends with suitable bolts.
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Post by showaddydadito on Apr 18, 2011 11:23:24 GMT
I'm adding a message here to bring this to the top of the list in the hope of helping, as I have seen several people asking about this problem recently - usually in a panic because dripping oil can be a sign of doom.
I found this thread when I had the problem, then forgot where I found it, but I cleaned the breather pipes and it cured the drip and made the running better.
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Post by amorti on Apr 18, 2011 14:14:24 GMT
I'm adding a message here to bring this to the top of the list in the hope of helping, as I have seen several people asking about this problem recently - usually in a panic because dripping oil can be a sign of doom. I found this thread when I had the problem, then forgot where I found it, but I cleaned the breather pipes and it cured the drip and made the running better. That will only help til they get blocked again, which they will. "Cleaning out airbox hoses" shouldn't be a weekly or monthly part of anyone's maintenance regime. What you need to do is what I posted half way up page 1 - replace the main breather hose with garden hose, which is thicker and doesn't kink under the fuel tank.
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Post by Deleted on Apr 18, 2011 14:18:41 GMT
I'm adding a message here to bring this to the top of the list in the hope of helping, as I have seen several people asking about this problem recently - usually in a panic because dripping oil can be a sign of doom. I found this thread when I had the problem, then forgot where I found it, but I cleaned the breather pipes and it cured the drip and made the running better. That will only help til they get blocked again, which they will. "Cleaning out airbox hoses" shouldn't be a weekly or monthly part of anyone's maintenance regime. What you need to do is what I posted half way up page 1 - replace the main breather hose with garden hose, which is thicker and doesn't kink under the fuel tank. I have to agree with Amorti, it might be a bodge but he's right.
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Post by samfan on Apr 18, 2011 18:56:39 GMT
Over filling with engine oil can cause a lot of oil leak problems ,It can also cause clutch drag and difficult gear changing. The bike must be on the centre stand when checking the oil level ,and not on the side stand ,The difference is about two litres of oil ,I found this out the hard way.
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Post by showaddydadito on Apr 19, 2011 7:25:55 GMT
I'm adding a message here to bring this to the top of the list in the hope of helping, as I have seen several people asking about this problem recently - usually in a panic because dripping oil can be a sign of doom. I found this thread when I had the problem, then forgot where I found it, but I cleaned the breather pipes and it cured the drip and made the running better. That will only help til they get blocked again, which they will. "Cleaning out airbox hoses" shouldn't be a weekly or monthly part of anyone's maintenance regime. What you need to do is what I posted half way up page 1 - replace the main breather hose with garden hose, which is thicker and doesn't kink under the fuel tank. Oh if only this were true - but none of my hoses were kinked. On my 96 divvy the one from the gearbox up to the airbox is, I presume, an original part, as it is pre-formed to make the necessary curves at each end. It is also very thick walled tube. The one from the rocker box although smaller, is also completely unkinked. So - replacing with different grade hosing is not the answer in my case. I have no idea how often it is going to need doing again, although the suggestion that it may be monthly or even weekly is entirely unwarranted. I have so far used the bike for 6 months before the problem manifested itself, and the previous owner clearly did only vital maintenance for a few years.
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Post by amorti on Apr 19, 2011 9:56:09 GMT
That will only help til they get blocked again, which they will. "Cleaning out airbox hoses" shouldn't be a weekly or monthly part of anyone's maintenance regime. What you need to do is what I posted half way up page 1 - replace the main breather hose with garden hose, which is thicker and doesn't kink under the fuel tank. Oh if only this were true - but none of my hoses were kinked.On my 96 divvy the one from the gearbox up to the airbox is, I presume, an original part, as it is pre-formed to make the necessary curves at each end. It is also very thick walled tube. The one from the rocker box although smaller, is also completely unkinked. So - replacing with different grade hosing is not the answer in my case. I have no idea how often it is going to need doing again, although the suggestion that it may be monthly or even weekly is entirely unwarranted. I have so far used the bike for 6 months before the problem manifested itself, and the previous owner clearly did only vital maintenance for a few years. They get trapped between the tank and airbox. You can't see it, as it only does it when the tank is down, but believe me it's there. Check the witness marks on the bottom of the tank and try bending the hose in your fingers.
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Post by rowlf on Mar 8, 2013 12:48:52 GMT
What you need to do is replace the breather hose from the back of the air filter box to where it joins the crankcase (right hand arrow) with about 14" of garden hose. Shown as 24 in the parts list
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timxj6
Scooter Rider
Posts: 64
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Post by timxj6 on Jun 3, 2013 11:49:12 GMT
So what your all trying to say is blank off the breather from the rocker cover (already have the garden hose on) as I'm still having this issue. Surely blanking of the rocker cover breather will end the problem as the no oil will be getting into the air box. Is that correct?
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Post by CD on Jul 16, 2013 14:31:09 GMT
That is one option and certainly the easiest. Another is to put an unequal branch tee in the main breather down near the gearbox end and run a longer tube from the cam cover to the small branch on the tee.
That way any oil blowby from the cam area can drain back into the sump and there should be no risk of pressurising the cam cover.
Do the easy one first. Unplug the cam cover tube from the airbox and plug the open ends. If you get some cam cover gasket leaks (unlikely) you can reinstate the cam cover breather but connect it as above.
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Post by rowlf on Jul 16, 2013 15:46:59 GMT
That is one option and certainly the easiest. Another is to put an unequal branch tee in the main breather down near the gearbox end and run a longer tube from the cam cover to the small branch on the tee. I have read about doing that and wondered about the crankcase pressure adding to rocker cover pressure. i.e. pressure "flowing" the wrong way. Might not be an issue.
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Post by CD on Dec 2, 2013 21:14:20 GMT
Before I get flamed for second guessing a solved problem, I'm not saying the new hose fix wont help. I'm asking if the problem might be a symptom of water getting into the sump.
I had a low mileage 600 that never leaked oil from the airbox. It was used in all weathers and a lot of the time in the Welsh valleys where it never rains of course. The clutch and its seal were in good condition so there was no route for rain to get into the sump.
Has anyone replaced a worn clutch shaft bearing and seal to find the oil blow by problem went away? That seal (when worn) is noted for letting water into the engine. Steam blowing off could carry oil vapour up the breather into the airbox.
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