Oil breather

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GUTS

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Sep 16, 2014
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Is it okay to block off the little breather pipe stub that empties inside the air cleaner? Mine seems to be dripping a little more than I like. I have 75 miles on the bike now and it's still running great. I checked the compression yesterday after a ride and the engine was nice and warm and it was between 175 and 180lbs on both cylinders. It really does run well. :D
 
Good compression #'s. :mrgreen:
I plugged mine. Oil vapor into a PAPER element didn't pass my logic test. JMHO
 
That tube vents the oil tank so I would not block the hose off. I would block off the hole in the air cleaner box if the hose is disconnected. I ran a short hose from the oil tank into a little K&N crankcase filter that dangles behind the gearbox. Got mine from Summit Racing. I have seen very little oil coming from it.

Oil breather
 
batrider said:
That tube vents the oil tank so I would not block the hose off. I would block off the hole in the air cleaner box if the hose is disconnected. I ran a short hose from the oil tank into a little K&N crankcase filter that dangles behind the gearbox. Got mine from Summit Racing. I have seen very little oil coming from it.

Oil breather
Click to expand...

+1. Get rid of the chain oiler though, if you haven't already.
 
GUTS said:
Is it okay to block off the little breather pipe stub that empties inside the air cleaner? Mine seems to be dripping a little more than I like.
Click to expand...

You could feed the breather pipe into a catch bottle. The 'H' mark on many dipsticks is too high. Lowering the level of oil in the tank can reduce the amount blown out of the breather.
 
batrider said:
That tube vents the oil tank so I would not block the hose off. I would block off the hole in the air cleaner box if the hose is disconnected. I ran a short hose from the oil tank into a little K&N crankcase filter that dangles behind the gearbox. Got mine from Summit Racing. I have seen very little oil coming from it.

Or use a K&N air filter and it does the same thing without having to disconnect the pipe from oil tank to the air filter. Assumes all original components are being used.
Click to expand...
 
Do like L.A.B. says. I made a hose to connect to that tank breather and sent it to a catch bottle. No more oil dripping out of the air cleaner and on to the top of the gearbox, but I've got the early central oil tank, not sure which one you're talking about, but the oil tank needs to breathe, just like the engine. If you block the tank breather it will build up pressure and oil will come out somewhere. Again, keep the oil tank level on the low side.
 
Thanks guys, I was actually wondering if the full mark was a little high and that's why it was spitting so bad. I have a new K&N filter to put on now.
 
Ever since I built my 850 Featherbed 34 years ago I have run the breather hose into a catch bottle as long as the catch bottle can breath as well, I run a big 2 litre plastic bottle with my engine breather and oil tank breather inside it from the top where the cap use to go on but the hoses sit near the bottom of the bottle, with 2 breather holes at the top of the bottle, it sits inbetween my engine plates behind the gear box and is out of the way.

Ashley
 
I use a large pill bottle to catch. But if you wet sump a lot, it will put more into it. I keep mine in front of the GB and, yes, it's a pain to take the air filter off, but it keeps the oil away.

Oil breather
 
That tube vents the oil tank so I would not block the hose off.
Click to expand...

agreed, do NOT block it off, it is part of your motor's ability to vent the crankcase

I went to AutoZone and for $20 bought the V shaped air filter looking thing pictured up thread and stuck it
on the end of the hose coming off the top of the oil tank, I have it hanging down behind the carbs

it looks so good I have already gotten three compliments on it in the past three weeks since I installed it!
 
I never noticed this breather tube until I read this post. I am running a K&N style filter and the breather hole is wide open in the plate. It is totally dry. Should I put some type of breather arrangement on it or is it good the way it is?
 
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