Question about 1997 Aprilia Pegaso 650

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Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix/test or parts inquiry. For more information about your issue please visit the website below. Good luck and have a nice day. DOWNLOAD 1997 Aprilia Pegaso 650

Posted on Oct 26, 2015

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Posted on Jan 02, 2017

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Why 1992harley pumps oil when cranking over to star

Check your oil tank level. If it is empty or very low, the oil has seeped by the oil pump check valve and has filled the engine cases with oil. I assume the oil is coming out the air cleaner breather tube? If so, add a quart or so to the oil tank, run the breather hose into a can or bottle, and start it up. Oil will flow out the breather until the cases have been purged. When it stops pumping out refill the oil tank to the proper level. This can happen when the bike has been sitting for a few months or more.

Mar 12, 2015 | 1993 Harley Davidson FLSTF Fat boy

1 Answer

What makes a 2005 Yamaha YZ 450 F Blow Oil Out The Crank Case Hose Into The Breather And White Smoke Out The Pipe Thanks

Hi, Shawn_luke_I 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 coming from breather vent
Oil out of breather tube on YZ250F
YAMAHA YZ450F Owner Service Manual
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Yamaha YZ450F Owner Manual

Aug 17, 2011 | 2005 Yamaha yZ 450 F

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The unit just started burning oil like crazy on start up. Tons of white smoke and oil coming out of the exhaust. Its a 4 stroke motor so im not sure what the problem is. Any help??

Remove the Oil Breather from the side of the engine near the base of the valves and clean it with both engine degreaser and carb cleaner. If the reed assy sticks on the breather the crank case will over pressurize and port oil into the breather. Also if the engine was over-serviced with oil it will present the symptom you describe. Sometimes a carb problem will allow fuel to leak into the crank case after sitting for a long time and the oil will have gas in the oil. Sniff check the oil. If it smells like gas you may also have a sticking carb float or float needle.

If you need more assistance just repsond here and I will help you.

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Jan 26, 2011 | Honda Garden

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Oil leaks caused by crank case ventillation. Need to know how oil / ventilation lines should be routed????

Ok, you have two ventilation hoses on the bike. First, the oil line from the tank goes to the inlet side of the oil pump facing the rear of the bike. The return line comes off the front side of the pump and goes to the oil filter. From there, the return line goes to the return fitting on the oil tank.

Now, there is one crankcase vent hose that comes out of the cam chest behind the front chain sprocket cover and runs to the backside of the oil tank. Then there is another one that comes from the top front of the cam chest and goes to the backside of the breather.

Now, the older Sportsters were notorious for shearing the scavenge gear drive pin. When this happened, the pump would pump all the oil into the engine but the it couldn't pump it back out. The engine would be full of oil, literally. Oil will come out of every seam on the engine. Look in the oil tank and see if it's dry. If so, the oil is all in the engine.

If this turns out to be the case, I can tell you how to replace the drive pin but it's not a job for the faint of heart as I recommend pulling the engine out of the frame. It can be done with the engine in the frame but in my opinion, it's a lot harder.

Good luck.

Aug 17, 2010 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

1993 model: Oil Tank pressurized and blowing oil cap off. Any suggestions where to look first?

all i can think of is something is wrong with the breather valve, in the right side crank case

Sep 06, 2009 | Harley Davidson FLHT Electra Glide...

1 Answer

Oil leaks from breather box

From your brief description It sounds like you are experiencing Crank Case pressure build up.
I presume your ZZR is of High mileage or possibly previous owners havn't serviced it regularly.
The problem being the compression Piston Rings wear and allow Blow Back gasses into the crank case there by building up pressure, this in turn sends an oil film up the breather tube to your air box resulting in your problem.
You could try an oil & filter change (Synthetic) Top jolly with maybe an additive plus similar for the fuel i.e. Red-Ex or similar, it may help but I doubt a cure.
If you want you could extend the breather pipe away from the box into a drip can or similar, be sure to filter it as you don't want to get contamination down in the cases.
Hope this sorts it for you?
Please press the Blue Button for appraisal of my FREE! Effort.
Thank You! & Good Luck.
Paul 'W' U.K.

Mar 05, 2009 | 2002 kawasaki ZZR 250

1 Answer

Where is located the oil breather on 1991 nissan 300zx

cornejo1971: There is no crank case oil breather per say. There are two PCV valves on the engine. There is one located on the intake plenum on each side. Typically there are hoses which come off the tops of the valve covers that go to the PCV valves.

Mar 04, 2009 | 1991 Nissan 300ZX

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