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I have a wr 400 1985 water cooled with a 390 engine water is getting to the spark plug and its oily the engine was rebuilt 1 hour ago ,i took the pipe off and it was full of water ,took head off the barrel exhaust port gets oily water slime ,if i pull the barrel is there a way to check test it ?if there is a crack?how would one check the lower case got to find where the leck is.

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  • 314 Answers

Rate these if you need good solution

Posted on Jan 17, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Fzr 750 won't start

Best guess it that the OHC (Over Head Cam) chain is not timed properly. If too far out of time the pistons can bend the valves and crack the valve guides. Let's hope not. Put a timing light on it while the starter is turning the motor over. If the lines don't match up you had best take a look at the OHC timing.

Google " yamaha FRZ 750 RT " Right now there is a factory service manual for your bike for sale on ebay. A link to the Ebay site is there when you Google.

Please rate this answer. Thanks Maverick 24!

Posted on Apr 14, 2009

todd0708
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SOURCE: sparks from my exhaust ??? Yamaha yz 125

if it still runs ok ,it was probably rust or debri from the muffler,if it dosent run ,or preformance changed after the sparks,internal engine damage would be a likely cause,part of a piston ring or something like that

Posted on Oct 05, 2009

  • 3 Answers

SOURCE: i have 1974 yamaha dt 250 enduro the bike sat

clean contacts on points with sandpaper (800 grit). located behind flywheel, will gurantee a fix. you can remove the side cover and get to contacts through holes in flywheel without removing it.

Posted on Nov 16, 2009

  • 5 Answers

SOURCE: My 04 blaster smokes and idles poorly,dies pushing throttle

stock pump sucks. i run 32:1 in my bike and runs great. take it to a dealer and have them check it out

Posted on Feb 14, 2010

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17 hp kubota burns out right side spark plug in in an hour, not filed just dead will not work on the other side if switched after burned out. What can cause that?


Hi Robert:
Sounds like you've some trouble shooting to do. Try starting by installing new spark plugs in all cylinders. Find a project and run the machine for an hour or so. Let it cool off, then pull the spark plugs. Keep track of which one is from each cylinder. There are some excellent charts available that show what is going on in an engine from the appearance of the plug. OILY & Fouled is usually bad rings, SOOTY black can be too rich a mixture, Too lean can make the tip look almost melted. Enjoy the chase!

Mar 03, 2015 | Kubota Garden

2 Answers

What causes the black oily stuff on brand new expensive spark plugs


Usually a bad ring or seal inside your engine allowing oil to get into the combustion chamber where the tip of the spark plug is located. Do you notice any smoke coming from the exhaust pipe ?? Do you seem to be adding oil more often ?? If so, the black oily stuff is "engine oil".

May 01, 2014 | 1997 Volkswagen Golf

2 Answers

About 2 weeks ago we filled up oil and then last weekend checked the oil was dry as a bone there are no oil leaks at all the car doesn't run hot no engine lights on it just sounds really loud rattling and...


Oil loss like that can only go one of 3 places, down the exhaust pipe, into the water jacket (unlikely), or out of the engine in a big puddle under the car. As you have guessed, the rattling and ticking noise is oil starvation, not a good thing.


If you are sure it is not merely leaking out externally, then check the coolant for signs of engine oil. It will be obvious as a dirty oily appearance. Water in the oil will show up as a milky looking deposit on the dipstick.


After that have a compression check done to see if a piston ring or valve stem seal has collapsed, and is allowing excess oil consumption. The spark plug tip will show evidence of that, being black and oily, instead of dry and light brown.


Another possibility is that a main or big end bearing has failed, and is overloading one cylinder with oil. Again it will show up on the spark plug tip. Such a failure will also be heard as a knocking noise, which varies with engine speed.

Oct 08, 2013 | Cars & Trucks

1 Answer

,y 84 nissan 30zx 2+2 is overheating.water pump works took thermostat out completely. there was no leaks in any hoses is this ok


Was the thermostat bad. To check it,put it in pot of water and boil on stove and see if it opens at 180 degrees,if it doesn't then it's bad.Are you sure water pump is circulating,doesn't have to leak to be bad.Is your radiator flowing good,not clogged and do you have a blown head gasket,check oil to see if it is milky.Is white smoke coming out of exhaust pipe.Also how does your spark plugs look like,not oily,I hope.

Sep 16, 2013 | 1984 Nissan 300ZX

1 Answer

So i was wondering i changed the spark plug on my bike including all oils, also included a costume yamaha fuel filter bike started fine rode it. Than second time i started it i forgot to turn gas line...


hi, the problem is that your bike is running to rich( to much fuel from carb to engine) so its the un-burned fuel mix that your seeing on your plug and thats fouling it out......now this is caused by either to rich of fuel mixture(you should be mixing 32:1) or you need to rejet carb so it delivers less fuel to engine... your carb has a jet in it and the # is stamped on it ( if you take the carb off and remove the bowl( 4 screws) you will see it,it will have an octagon shaped head.) for example if the # on it is 55 then you need to go with a 53 or 54...... also a good sign you need to rejet with a smaller jet is your bike will spooge(leak) a black oily residue from exhaust pipe and muffler( same residue thats fouling the spark plug.)

Sep 27, 2010 | 2003 Yamaha YZ 125

1 Answer

How do you change the back spark plugs


First up to gain access to the rear plugs, you need to rotate the engine forward. Sounds crazy, I agree. When I first heard it I was thinking they are nuts, but, it rotates: 1) Block rear wheels 2) Put transmission in neutral 3) Remove the air cleaner duct and air cleaner 4) Remove the bolts (1 each) from both forward engine torque struts (they are the two things bolted down on each side of the hood latch on top of the radiator. remove the bolt from each of these that keeps the engine in place) 5) Use a ratchet strap to rotate the engine forward to gain access to the rear plugs
Tips: If the engine does not want to rotate enough, you may need to go under the van and disconnect the exhaust manifold from the rest of the exhaust system. It is not hard to find. Follow the pipe towards the engine, just to the rear of the engine there will be an exhaust flange with 2 bolts, remove those disconnecting the engine from the rest of the exhaust. Now the engine should rotate even farther forward. Some manuals claim that there is a flex pipe on the exhaust already, however, I know personally that my van does not. You may also have a similar situation. This may sound like a lot, but it can be done in a few hours.
The first time I tried, I did not know about the exhaust thing and could not reach the rear plugs. I took it in to a shop and it cost me over 160 bucks for them to do it. Mostly labor. For the first time going through, I would allow yourself about 4 hours to make it happen. Only because you are going to have to use a systematic approach step by step and figure out the van as you go. The shop took 2 hours to get it done.

May 12, 2010 | 2000 Chevrolet Venture

1 Answer

I have a 2001 yamaha wr250f and after running only a couple minutes the header pipe is glowing orange!! verry hot, what are some of the things that may cause this? thanks Rod.


Air leak causing a lean fuel/air mixture, bad radiator cap killing pressure in the cooling system, low water in the radiator, plugged radiator, broken water pump, not using premium gas and a spark plug with the wrong heat range.

Please rate this solution. Thanks rodsixfifty! < cool name

Apr 20, 2009 | 2003 Yamaha WR 250 F

1 Answer

Oily watery stuff coming out off the exhaust, oil pump is set ok


is this bike a yamaha rd 350 twin cylinder 2 stroke? if so, its air cooled and you should not be getting a ltr of water.. but it is common for them to have a "oily" fluid come out the exhaust because it is a 2 stroke. but not alot. it comes from the engine not burning all the oil gas mix. does the engine spit and sputter? make sure there is no water in the tank, make sure the air filter is clean and buy hotter spark plugs. also adjusting the fuel air mixture may help. hope this helps...

Mar 11, 2009 | 1986 Yamaha RD 350

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