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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2 Answers

I have a 1988 Scottsdale 305 4x4 manual trans.its leaking oil so bad smoke rolls from under the hood when I come to a stop.i know the exhaust it lose but could it be just that?


Yup, oil is leaking directly onto the exhaust and burning. Fix the oil leaks, normally always the valve cover gaskets, and replace the pcv valve(PCV positive crankcase ventilation valve). See can you put another PCV valve in the other valve cover and run it to the breather. The more of these lines you hook between the engine and breather, the less it will leak because vacuum is pulling all the pressure out of the engine block and crankcase so it won't push the oil out. My 383 small block has a bad front main seal, I hooked up another tube and it can't push oil out the seal. No more leaks. Hope you get her fixed soon Bro, you really look bad with all that smoke coming from your truck.

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1 Answer

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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.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

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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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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


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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???

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1 Answer

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Hi, Anonymous and the usual suspects are:
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4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
6. Blow by drain tube cracked/split or filled to capacity.
For more information about your question and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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1 Answer

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4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
6. Blow by drain tube cracked/split or filled to capacity.
For more information about your question and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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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.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

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4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
6. Blow by drain tube cracked/split or filled to capacity.
For more information about your question and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


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2 Answers

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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.

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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....

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