Question about Yamaha YZ 426 F Motorcycles

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My yz400f is leaking oil out of the valve breather tube.. is that normal? is there a way to fix it if it's a proble,?

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Is the engine breathing hard??? if it is then all this air thats forsing oil out is from the cylinders its getting past the pistons and blowing into the sump,,,in two words,,,your engine is getting "claped out!" to find this out undo the oil filler plug when the engine is hot and running if a lot of air is forsed out the pistons have worn out
if its just a bad joint or gasket fix the thing

Posted on Jul 28, 2010

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Its not normal! replace the oil seal

Posted on Jul 28, 2010

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Posted on Jan 02, 2017

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1 Answer

Leaking oil from the vent tube all the time


Hi, JD oil level readings are taken when the engine has reached normal operating temperature and the usual suspects are:
1. Overfilled oil tank dipstick reading should at or below full.
2. If the sight glass is full you are running to much oil.
3. Excessive blowby caused by worn out piston rings.
4. Piston rings never properly seated.
5. Faulty breather valve or system.
6. Pinched or clogged breather line/hose.
7. Clogged or failed oil filter.
8. Contaminated oil dirt-rust-water etc.
9. Excessive oil foaming.
10. Wrong oil type not designed for your bike.
Good luck and have a wonderful day.

Mar 03, 2017 | Motorcycles

1 Answer

On a revtech 110 why is oil blowing out the breather tubes and head?


Hi, Chasity oil leaking from your air cleaner is caused by oil carryover from the engine. For whatever reason, the breather system is not separating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more expensive ones. First, make sure your breather hoses are not dry and cracked if they are ok you can start by trying the following:
1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from the head into a TEE fitting below carb/induction module then a single line into a mini filter under the frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump.
5. Upgrade oil pump and cam plate.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
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Oct 16, 2016 | Motorcycles

1 Answer

What should the compressin be on a briggs


What is the compression ratio for my engine?

Briggs & Stratton side valve (L-Head) engines use a compression ratio of 6 to 1.Our Overhead Valve (OHV) engines use a compression ratio of 8.5 to 1.

What would cause my engine to "puff" smoke while it runs?

White/blue smoking usually indicates the burning of oil. Causes to this condition include:
  • Overfilling the crankcase with oil
  • Incorrect oil grade
  • Operating engine at greater than a 15 degree angle
  • Inoperative crankcase breather
  • Crankcase air leak
  • Blown head gasket
  • Worn cylinder and/or rings
  • Turning/Tilting the engine on its side for any reason (storage, changing oil, etc). If the engine has to be tilted, ensure the spark plug is facing upwards to help prevent oil from escaping the crankcase.
Also, be aware that any small air leak can cause an excess of air entering the crankcase and will create a higher oil mist than the breather is capable of handling. The excess oil will then return through the breather tube and back to the air filter. Engine oil capacity is dependant on your specific engine model. To determine your engine's oil capacity, please visit our Oil Capacitypage. Oil level checking and changing intervals are available on ourMaintenance Schedule page, as well as a hyperlink (text highlighted in blue) leading to oil changing procedures.
The "Oil" section of your Operator's Manual also contains this information. Other possible causes include operating or tilting the unit at an angle, an obstruction in the breather tube (located behind the air filter), damage to the cylinder/piston rings, etc.

Jul 23, 2015 | Garden

1 Answer

I have 1998 fatboy leaking oil out of air breather i have replaced breather valve umbrella valves drilled out the holes on top but still leaking


Do you have the rubber tubes going from hollow breather bolts into the intake opening of the induction system??

Do you possibly have worn out compression rings???

Jun 04, 2014 | 2000 Harley Davidson FLSTF Fat boy

1 Answer

Crankcase breather tube


Hi Anonymous, oil leaking from your air cleaner is caused by oil carryover from the engine. For what ever reason the breather system is not seperating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more exspensive ones. Start by trying the following:
1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from head into a TEE fitting below carb/induction module then a single line into a mini filter under frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump
5. Upgrade oil pump and cam plate
Good luck and have nice day.

Jul 17, 2012 | Harley Davidson FLHT Electra Glide...

1 Answer

Breather tube throwing oil into carb


Oil coming via the engine breather can mean a worn engine, it could be as simple as an over filled sump, or the breather valve itself is not working, the breather valve allows the crankcase pressure out of the engine.

Apr 20, 2012 | Cub Cadet Garden

2 Answers

1999 yz400f leaking milky out of the hose that comes from valve cover what could ot be


All engines have a breather to equalize pressure between the internal crankcase(moving parts, blow by, etc) and the outside air pressure. Heating and cooling of the motor can cause condensation (also stream crossings, rainstorms, mud puddles, etc.)in the motor which will show up in the pollution tube, bottom of the air cleaner, or breather tube as a creamy tan or gray milky liquid. It is normal and nothing to worry about unless you submerged the bike in a stream and filled the engine with water. In this case you need to change the oil immediately and get the moisture out so you don't rust up the motor.

May 06, 2010 | 2003 Yamaha YZ 450 F

1 Answer

Oil on breather tubes.


Not sure how many miles you have but oil on breather tubes (depending on how much) is normal the problem is when you have excessive blowby and high oil consumption. When was the top end done last... If never, it's due....

Sep 08, 2009 | 2008 Harley Davidson FLHX Street Glide

1 Answer

Oil getting into the air filter and cover after a ride


oil seems to be comming up from the crankase breather tube, which shoud only bring up fumes. most probable cause is oil is over filled.if oil level is good, problem lays in the breather valve mechanism in the engine, or severly leaking piston rings

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1 Answer

Excessive smoke


after winter the oil comming out of the breather tube is normal as the bike has been sitting for a while (I own a 1980 since 87) i also had evolution valve stem seals put in the valve guides, as it is normal for a shovel to burn a liter of oil per 1000km, but with the newer valve stem seals, hardly any oil burns

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