Question about 2000 VOR Mx 400

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Blue smoke When I start the bike up I get blue smoke from the exhausts for about 10 seconds - is this the valve seals - is it a big job? how much for a garage to do it? could I do it myself - would I need special tools? I've done a return spring so can lift a spanner, but never been fuurther than a tappet in the engine.

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If you are not using oil, and the smoke only lasts for 10 seconds or so, and you get no more smoke later, then I would ignore it. If the guides were worn, you would also be getting smoke on the overrun. Are the plugs getting fouled up? Again if not, ignore. If it aint really broke, don't pay out wads to fix it. (Unless you are a perfectionist, and insist on everything being perfect regardless of cost). Even if the guides are a little worn, and it will only be a little at this point, they will go on for some time yet.

Posted on Nov 10, 2008

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1 Answer

Why do I have blue/white smoke coming out of my exhaust?


Appears you are burning oil intermittently. Ring job in order.

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My Bike emits Bluish Smoke at Start Up and then at Deceleration.


OK, since you didn't mention a make model, year or number of cylinders this is just an old mechanics take on the situation. Blue smoke on deceleration (closing the throttle) is because of high vacuum in the cylinder pulling oil past either the piston rings or valve seals. Usually, blue smoke on a cold start is caused by the valve seals leaking into the cylinder while the bike is sitting. A quick check to see if the piston rings are at fault would be either to come down a long steep hill or accelerate hard then close the throttle, if it emits a sizable amount of blue smoke when you open the throttle again, the rings are most likly at fault.
The oil getting black is it doing it's job of keeping the engine clean, and the oil consumption you mention would not necessarily be cause for concern on an air cooled engine, especially in a warm climate. Is it possible this condition existed before all this work was done? If so, I'd suspect a carburetor problem, an over rich mixture, possibly because of a faulty float valve or the float itself contaminating the oil with raw fuel, especially if the bike is left on the side stand without the petcock being turned off.
To sum things up, a leak down test will show the condition of the rings and valves. Also might mention that if newer type (usually blue or green color) valve stem seals were used, there is a special procedure for installing them not all mechanics are aware of. The valve must be put in the guide first and the seal worked over the stem with the thumb then it can be tapped down onto the guide. Hope some of this helps, Frank

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If it started to smoke after a service but didnt before, check for over-filled oil.
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1 Answer

My Hero Honda Glamour (2008 byke without disk brake)is emmiting white smoke.


That seems a big job, did he say how much he will charge to do it?

I think, unless you are an engineer you will need a manual to do a job like that, although you may find one somewhere on the Internet, if I were to attempt that I would prefer to have a paper one, I could refer to as I went along.

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1 Answer

White smoke coming out of my yamaha 2008 r6 whenever i start the bike. why is the white smoke coming out ?


Hi, Anonymous your instrument gauges and lights can alert you to most electrical and engine issues they can not warn you about failed engine gaskets or seals so your engine has to resort to old fashion alert methods of colored "SMOKE SIGNALS" here is a breakdown of their meaning:
1. WHITE SMOKE on start-up can is usually caused by a blown head gasket allowing coolant to enter the combustion chamber and may start dripping out of the exhaust pipes or mufflers.
2. BLUE SMOKE on start-up is usually caused by failed valve seals. Smoke that is constant while riding is usually caused by valve to guide and piston ring clearances that have exceeded service wear limits.
3. BLACK SMOKE on start-up is usually caused by too much fuel in the combustion chamber this can be due to air/fuel mixture adjustment too rich, accelerator pump improperly adjusted, faulty choke/enrichner or not in the off position, faulty carburetor float needle and seat, pilot jet too large, fuel injectors leaking, smoke while riding is usually caused by the main jet being too large.
It should be noted that aggressive or abnormal throttle operation will cause these conditions to manifest themselves exponentially.
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 nice day.
http://www.r6-forum.com/forums/57-garage-mechanical-help/205697-white-smoke-exhaust.html
White Smoke Coming Out My Exhaust Please Help
2008 2009 Yamaha YZF R6 Service Manual R6 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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I have a 2002 Yamaha xv250 v twin. One of the exhausts is blowing blue smoke. Does this mean engine oil is being burnt in the cyclinder. I want to being able to fix this myself. What should I do?


It could either be engine oil or excess fuel. My best bet is oil.

I would suggest getting an experienced mechanic, motor or motorbike to have a look. Heads must come off. Sleeve must be inspected for cracks and wear. Oil and pressure rings must be replaced and new gasket must be put in for head. If the pistons are worn it sometimes pay to buy pistons with rings allready fitted at reasonable price. If you start this yourself. see it through,

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Continuous or just for the 5-10 seconds.
If continuous you may have oil seeping past your pistons oil rings or valve guides oil seals.
Check your spark plug see if they are fouled badly (covered heavily and oily) or just covered by oil and sooth lightly.
If 5-10 sec it is normal as the engine is heating up there are normally a little oil seeping past the seals.

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1 Answer

Blue smoke


but never been fuurther than a tappet in the engine.If you are not using oil and the smoke only lasts for 10 seconds or so and you get no more smoke later, then I would ignore it. If the guides were worn, you would also be getting smoke on the overrun. Are the plugs getting fouled up? Again if not, ignore. If it aint really broke, don't pay out wads to fix it. (Unless you are a perfectionist, and insist on everything being perfect regardless of cost). Even if the guides are a little worn, and it will only be a little at this point, they will go on for some time yet.,,,

Nov 10, 2008 | 2000 Moto Guzzi Quota 1100 ES

1 Answer

Blue smoke


but never been fuurther than a tappet in the engine.If you are not using oil and the smoke only lasts for 10 seconds or so and you get no more smoke later, then I would ignore it. If the guides were worn, you would also be getting smoke on the overrun. Are the plugs getting fouled up? Again if not, ignore. If it aint really broke, don't pay out wads to fix it. (Unless you are a perfectionist, and insist on everything being perfect regardless of cost). Even if the guides are a little worn, and it will only be a little at this point, they will go on for some time yet.,,,

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1 Answer

Blue smoke


but never been fuurther than a tappet in the engine.If you are not using oil and the smoke only lasts for 10 seconds or so and you get no more smoke later, then I would ignore it. If the guides were worn, you would also be getting smoke on the overrun. Are the plugs getting fouled up? Again if not, ignore. If it aint really broke, don't pay out wads to fix it. (Unless you are a perfectionist, and insist on everything being perfect regardless of cost). Even if the guides are a little worn, and it will only be a little at this point, they will go on for some time yet.,,,

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