Question about 1985 Yamaha XS 400

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Engine smoking on start up

I have a 2000 yamaha ultramatic 400 quad which on starting blows white smoke but after it warm up the smoke clears. It just started doing this reciently.

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  • Anonymous Feb 03, 2009

    yes its probably engine wear sound normal I only get 35mpg a gpz600'88

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White smoke indicates head gasket leaking into exhaust

Posted on Nov 12, 2008

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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

Apr 28, 2012 | 2008 Yamaha YZF-R6

2 Answers

Hi, i have a ttr 250 1999 model, its blowing smoke, but my piston and rings are fine. what do you think it could be


A malfunctioning carburetor (running too rich) , will blow white smoke. I would start by checking the choke plunger, the seal could be leaking fuel. The plastic cap that holds the plunger on could be cracked and not holding the plunger in all the way. If you have re jetted the carburetor, perhaps the jet is too big. Your air filter could be plugged with dirt. All these things could cause a rich condition that would cause white smoke.

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1 Answer

2002 TDR 125: excessive white smoke from exhaust driving at 65 k...


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.
Dirt Rider Magazine
Dirt Rider Magazine
http://www.yamaha-motor.com/assets/service/manuals/2007/LIT-11626-20-01_ttr125all_1961.pdf
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YAMAHA TDR125 Owner Manual

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1 Answer

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Sounds like you have a blown set of rings or have burned a hole in the top of a piston. Do a compression check to confirm.

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2 Answers

It is smoking


worn valves or worn rings will cause it to burn oil.

Oct 20, 2009 | 2004 Yamaha TT-R 125 L

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