Question about 1992 Yamaha FZR 600

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Oil pumping out of crank breather pipe oil smells of petrol also on my 1992 fzr 600

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Hi, Raymond you may have carb overflow issues getting into the combustion chamber due to faulty float or needle and seat 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.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a wonderful day.
Oil pumping from crankcase breather tube
Motorcycle Message Board Motorcycle USA
OEM parts for Yamaha
Yamaha FZR600 1989 1999 Workshop Service Manual Repair Download Manuals... $10 cheap
Yamaha FZR600L Owner Manual

Btw, I’m available to help over the phone in case u need at

Posted on Apr 24, 2017


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1 Answer

Oil shooting in to the air box

From your brief description I'm guessing a high mileage machine? or Previous owners have revved too much from cold?
It sounds like the engine is possibly breathing? the pistons and compression rings are worn so exhaust gasses and compression leaks past them and pressurizes the crank case sending oil out the breather, so the air filter draws it in.
If the bike is performing o.k. and you can live with it try a dribble/breather can? pop the vent pipe into a seperate container to catch it. Make sure you seal the hole in the air filter so contaminents can't get in. also the new breather needs air circulation so trial and error on a recepticle.
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