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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Posted on Feb 28, 2012

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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?


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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1 Answer

BGE3000 Engine problem

There is only one way for fuel to get into the oil plus be coming out the breather and that is a float/needle valve issue.
Check that your float does not have a hole in it and it weighs too much and is staying down instead of floating..

Feb 18, 2018 | Cannon Electrical Supplies

1 Answer

Over fueling

Hey Scott,,
Do not crank your bike again!!. Drain the the oil. see what color it is?? Is it creamy color?? Change the oil filter!!! If it is creamy - this is something that is mixing with your oil (gas).. Time to have your carburetors PROFESSIONALLY cleaned and set... if your engine "hunts" at idle could be a carb issue or the throttle cable that is too tight, OR the intake valves are TOO TIGHT..this will cause a "high idle and floating idle".. After having the carbs professionally done, replace the air filter(s) and install new spark plugs... it should be fine..

Aug 10, 2017 | Motorcycles

1 Answer

2005 Honda CR 85 R keeps fouling spark plugs

Hi, William and the usual suspects are:
1. The first thing to do if your spark plug has been fouled is to check the air filter. If it's really dirty, that makes it difficult for air to get through to the engine, causing a rich condition. Either clean it thoroughly with some Air Filter Cleaner or buy a new filter. Before you put it back in the air-box, treat with some air filter oil or spray. "WARNING" adding too much oil can also clog up the filter, resulting in another fouled plug.
2. While the gas/oil ratio doesn't equate to what the jetting is, you can still foul plugs, or worse, if the mixture is wrong. Depending on your bike, it's best to look at your owner's manual for the correct ratio. For most 2-stroke motocross bikes, a ratio is 32:1 or 40:1, the gas being 32 or 40, and oil being 1. For those that don't it, it means that for every 128 ounces (one gallon) of gas, you add 4 ounces of 2-stroke oil for a 32:1 ration, or just over 3 ounces for a 40:1 ratio.
If you have too much oil in the mixture (such as 12:1), then you will probably end up fouling the plug because it is more difficult to burn that much oil. Don't try to cut corners with the oil though, because it's very important for your dirt bike's engine. 2-stokes need the oil for lubrication on the cylinder walls, so if you don't have enough (or any for that matter) then the cylinder walls will run dry, causing it to overheat and seize the engine very quickly. So it's very important that you put in the right mixture pre-mix to your 2-stroke gas tank.
Also, 2-strokes have reeds that air and fuel go through into the cylinder, so if they are cracked or broken the bike will not run right. This could cause the plug to foul, so before you go out and buy anything expensive, make sure the reeds are still good.
3. While this usually isn't the main problem, it could be that your spark plug isn't burning hot enough. Having a hotter spark will ignite the fuel stronger, leaving less residual gas/oil in the cylinder that could cause the plug to foul. This "ISN'T" the best choice, but I'd say it's safe to go one plug hotter than stock. Keep an eye on the plug color you're looking for a light tan color anything whiter and you could burn a hole in your piston. Spark plug manufacturers aren't always the same, so make sure you find out how they rate them.
4. Almost every motocross bike comes rich from the factory (especially Honda 2-Strokes when they were being made). It's usually a pretty simple fix, but many riders are too lazy and would rather continue buying plugs instead of spending a few bucks on jets.
5. Piston rings badly worn or broken.
6. Faulty ignition coil low output.
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.
CR85R fouling spark plugs
06 CR85 Fouling plugs
CR80R RB CR85R RB 1995 2007 Workshop Manual Models Download Manuals... $15
Honda CR85 Expert Owner Manual

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

Aug 18, 2011 | 2005 Honda CR 85 R

1 Answer

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

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

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. : )
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

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

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