Question about 1998 Yamaha YZF-R1

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I have R1 4xv and there is oil mixed with fuel licking from my air filter box.And what's the best engine oil for that bike as I'm going to change it

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Water pipe to water pump o-ring broken

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I have a 99 4xv done 6000 miles, going to change oil and filter. Is there one thats better than another, same with filter?

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Posted on Jun 14, 2010

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Before you change the oli ,find out where and how theb oil is getting to your air cleaner .

Posted on Apr 26, 2010

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Oil level via the glass window. I never saw the oil level in the glass window (whether bike was running or not). I was leaking a lot of oil from the airbox hose, and the air filter was oil soaked. So I...


When the bike is on the center stand and on a level surface, the oil should be in the middle of the window. Chances are strong that compression is getting past the piston rings and into the gear box. The compression carries air and fuel into the box. The fuel mixes with the oil and will increase the amount of "oil-gas" in the box. As the oil-gas level rises, the air carries some of the oil-gas out of the box and into the air box. The fix is to bore the cylinders and install 1st oversize piston and rings. Re-seat the valves wile the engine is apart. Put it all back together and you have a near new engine with power you did not know was there.

Aug 12, 2011 | 1982 Yamaha XJ 650

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What oil for my xxxxx motorcycle?


This seems to be a very common question, and even if its been written before is worth going through again. This is the simple version as there are a wide variety of bike from scooters, cruisers to racers

Do not use car engine oils they will cause wet clutches to slip.

Motorcycle shops are your best source, auto shops often have the oil but make sure it says motorcycles.
The labelling will tell you but read it carefully.

Four stroke or two stroke?, this you will have to know or find out and is quite important for your engine.

Two strokes burn some oil with the petrol so you need two stroke engine oil which is mixed with the fuel either by mixing with the petrol and putting in the fuel tank or via an injection system with a separate oil tank under the seat or side cover.
Two strokes will also need two stroke transmission or gear box oil, this lubricates the gears and clutch and needs changing when servicing.

Four strokes use the same oil to lubricate the engine, gearbox and often the clutch, so it needs changing often.

There are mineral oils, semi synthetic and full synthetic, with a big difference in price, so your budget may be a deciding factor.
Mineral oils are fine for low stress commuters.
Semi synthetic works in most bikes.
Full synthetic for the high power race bred,or you just want he best.
The weight or "W" value will depend on the bike, the usage, the tempurature etc
For this you need to consult your manual, read the labels and make a decision.
The staff at bike shops will help if its still all confusing, just by telling them the model and where you ride.
Dont forget a new filter at each oil change



on Apr 06, 2010 | Motorcycles

1 Answer

Bike was running great then it started to studdering.brought it home looked at then noticed that the air box was full of gas and oil. why?


Some compression from the engine is getting past the rings and into the gearbox. With the compression comes some unburned fuel. The fuel mixes with the gearbox oil and increases the oil level in the gearbox. Now the "oil-gas" level is very close to the vent hose on the top of the gearbox. Remember that compression going into the gearbox? It now carries bits of oil-gas into the vent hose. Where does the vent hose vent to? The air box. The "low cost-getting by" remedy is to do an oil change, clean the air box, install a clean air filter and then do more frequent oil changes in the future. The proper fix is to do an expensive top end job on the engine. Please rate my answer. Thanks.

Jun 03, 2011 | 2004 kawasaki ZRX 1200 R

1 Answer

Location of oil filter and what kinda of oil on a 2003 Honda CR125R 2-stroke


G'day.
There is no oil filter in a two stroke. Your bike has two types of oil for the engine.

In the gearbox, it uses a light viscosity 2 stroke motorcycle gearbox oil.

Then you have the oil that you pre-mix with your fuel(to lubricate the top-end & crankshaft bearings).

Oil for your bike is best purchased from a motorcycle shop- this is a racing bike that requires race type maintainance.
The better the maintainance the longer it will last.
Things like,
Keep the chain lubricated.
Keep the air filter clean & oiled correctly with propper air filter oil(this is REALLY important).
Use high octaine fuel-(if in Australia like me-no ethanol fuel- 98 octaine).
Use the best quality 2 stroke oil you can afford-preferably full-synthetic.
Here is a link to parts fishes(exploded diagrams) for your bike.
These will help you see all the parts & gives a good idea on what goes where.Click on the part name & it will show you a picture. : )
http://www.mrcycles.com/fiche_select2.asp?category=Motorcycles&make=Honda&year=2003&fveh=3243
If you have any other questions don't hesitate to ask.
Kind regards Andrew Porrelli

May 19, 2011 | 2003 Honda CR 125 R

1 Answer

Putting engine oil in to air box


Some of your compression is getting past the piston rings and into the gearbox, this is commonly called "blow-by". The pressurized fuel/air mix then exits the gearbox via a crankcase breather tube that runs into the filter box for recycling back through the carbs. The only problem with this is that some of the blow-by mixes with the oil in the gearbox and that mix goes into the breather tube also. The result is oil in the air box AND diluted oil in the gearbox. The diluted oil can build up in the gearbox and actually raise the fluid level in the box. This makes the problem even worse. Do an oil change and maintain the proper oil level. The real fix is to have the cylinders bored then install first oversize pistons and rings and do a valve job while the head is already off. The "Real Fix" is expensive. On that basis, I would simply do more frequent oil changes and not worry about the air filter. Please rate my answer.

Apr 26, 2011 | 1996 Yamaha XJR 400

2 Answers

The Bike was running fine then I removed the air box to install a set of pod air filters and now the bike wont run, are the carbs needing to be adjusted to compensate for not having the original air box?


my goodness kids do your research. carbs mix air and gas very specifically. any change in air intake will mean you also need to adjust the flow of gas in carbs. even if you use an aftermarket filter in the original air box it will still change the amount of air going to the carb, it might not be as drastic as a pod filter but it is still a change. you will probably need to change the main jets in your carburetor as well as play with the air/fuel mixture setting screw.

Feb 02, 2011 | 1983 Yamaha XS 400 L Maxim

1 Answer

My 95 xr600r dirt bike leaks oil


This hose should be connected to the air filter box.

It's for ventilation of the crankcase, much like the PCV (Positive Crankcase Ventilation) in cars. As the bike runs, the crankcase gets hot enough to vaporize some of the oil. And since there's always at least a little bit of combustion blowby in the cylinders, you get a bit of fuel/air thrown into the mix and an oil/fuel/air "atmosphere" in the crankcase, which isn't an ideal situation. So, when the hose is connected to the air filter box, it slightly vacuums off this atmosphere, letting the engine burn it and expel it through the exhaust.

If it's not connected to the airbox, the vapors can condense back to oil and just drip out.

If a lot of oil is coming out ("a lot" is hard to quantify), you could be getting excessive blowby because of a broken ring or cracked piston.

Hook that breather line back up to the airbox and unless the bike smokes excessively, I wouldn't worry about it.

If it IS hooked up, it or the airbox is cracked and needs fixing/replacing. If the breather line has somehow become plugged (mud-daubers are amazing at finding holes to makes homes out of), the pressure buildup could have split your vent line.

May 11, 2010 | 1995 Honda XR 600 R

1 Answer

2003 honda shadow spirit vt750 carb problem


buddy dont worry about it what you have done is put to much oil inside the engine and as the piston goes down it cause abit off pressure which in the small space it has when you over filled it the pressure inside has just forced the oil out the breather into the air box just give it a little clean and drop oil aswell bud

Sep 04, 2009 | 2003 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

1994 Kawasaki ZZR-400 Leaks oil and doesnt start sometimes.


that box is called the air box, its where you engine breathes in its air. you say its leaking oil? these boxes are normally a bit oily but only really surface oil. If you can actually see liquid oil you have a problem with your petrol shut off. When the bike isnt running petrol will leak into the engine through the piston. When you start the bike all the petrol mixed with the engine oil will be pumped back into the air box. also check the level of the engine oil, if too much has been put in there then that can also be pumped back into the air box. If the petrol and oil has been mixing you must change the oil as petrol thins the oil and your bike could catch fire, the engine wear will be really bad.

Aug 29, 2009 | 1994 kawasaki ZZR 400

2 Answers

Tyre pressures and oil grade.


gearbox oil-20w/40 0.73 qts. cooling system-1.26 qts. 50/50 mix 2-stroke oil-shell racing x/40 fuel grade-98 spark plug-ngk r 6918-b8 spark plug gap--.024" main jet-190 idle jet-48 needle position-3 pilot screw # of turns out-1.5 rear tire pressure-14 lbs front tire pressure-14 lbs keep air filter element well cleaned & oiled w/ air filter oil.there are service manuals available for this model.

Feb 18, 2009 | 2003 KTM SX 125

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