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January 17th, 2012, 04:31 AM   #1
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oil breather, loosing oil

hi every one just a quick question, why is my 03 berg loosing lots of oil threw the frame from my oil breather, its that bad it was fouling my plug as it went back threw the carb and makin the bike cut out, and smoking more than a bike eva should. so i a made a little mod on the rubber boot on the carb using a 2mm hole and some tube for it to drain out instead of getting sucked threw the carb and fouling my plug, i know its not the oil level as it is filled well below the glass peep hole. its worrying me as i can leave it ticking over and the amount of oil dripping out of the tube is way too much. hope some one can help me out with this one.

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January 17th, 2012, 05:47 AM   #2
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Re: oil breather, loosing oil

first of all, what bike and what year. a couple of things to look for. check that the reed valve at the base of the motor is'nt broken. second (depending on what motor you have) if you have two breather vents on the rocker cover try blocking off the rear one. you can also do a search for engine breather mods, I did a mod and added an automotive breather valve and it solved my problem of oil loss through the vent. If your loosing enough oil to foul your plug I think maybe the reed vavle is broken.
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January 17th, 2012, 06:09 AM   #3
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Re: oil breather, loosing oil

did you tip the bike over then noticed the oil and plug fouling? if you tiped it over then a lot of oil can get in there, also when the engine is cold or ran at high rpm more oil can get in there, a lot of people modify the breather system so the hoses dont go into the frame but get rerouted elsewhere then theres no way oil can get in there if yours has a front and rear hose coming out of the head and into the frame some people block off the rear one and reroute the front on or something, if you search breather mod you will find some different ways how to do it, how much oil are you actually losing though? do you need to add oil because it goes low? if i remember right i also seemed to add oil (not a lot) after a few shorter rides until i rerouted my breather now i dont lose any and starts immediatly even if tipped upside down, im not sure if this is what you have got going on or not but it may be worth a look into, you also may want to check your reed valve inside the clutch cover to make sure its not clogged or broken off..
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January 17th, 2012, 06:12 AM   #4
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Re: oil breather, loosing oil

helithumper beat me to it... i have been trying to finish typing that for half an hour, my kids arent leaving me alone
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January 17th, 2012, 07:17 AM   #5
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Re: oil breather, loosing oil

thanks very much lads for ur replys my bike is 650 fe 2003 and it only has the 1 cone style breather at the front of the rocker cover, i can loose about an egg cup full if i leave it ticking over for 15 min and when i take the air filter off the fame is pissed wet threw with oil from being cleaned just before, will take clutch cover off tomorrow to see wot its like and have a look for these breather mods. and same here bergini took me ages as my kids wont let me type lol
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January 17th, 2012, 08:28 AM   #6
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Re: oil breather, loosing oil

That's why I own a dog and not kids!!!!!
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January 17th, 2012, 01:14 PM   #7
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Re: oil breather, loosing oil

wots the chances of it being the piston rings or is it more likly to be the reed valve
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January 17th, 2012, 09:55 PM   #8
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Re: oil breather, loosing oil

I guess it depends on how quickly the problem started. Overnight, maybe the reed valve. Most likely rings. Checking the reed valve is a lot easier than checking the rings.
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January 18th, 2012, 01:14 AM   #9
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Re: oil breather, loosing oil

Berger, in two lines you said it all !
There is also the possibility of the valve gides.

ZAGA
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January 18th, 2012, 03:34 AM   #10
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Re: oil breather, loosing oil

Hey BERGER and ZAGA. how could it be the piston ring or valve guides, He said the oil was coming throught the breather into the intake. He also said the inside of the frame was covered. the rings and the valve seals would be my first two I look at if I'm buring oil with no evidence of oil in the frame.
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