Question about 1973 Yamaha RD 250

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RD 250 - I am getting excessive white smoke coming from the exhaust while driving down the road - cause? The engine bogs down when starting off from a stop light - cause?

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Hi people ' if White smoke is continuously coming out of pipes there are many facts and causes first if you are losing power also it may be piston rings worn (2) if White smoke is jetting out when reving engine, depending on the fact that we are talking about 2 stroke engines then check 2 stroke oil mix is measured out before put in fuel (3) check and test 2stroke oil pump for adjustments and reset (4) most important crank case seals give off symptoms of above .. Poor idleling loss of power & compression . Check these areas out . Hope this helps simon R. :)

Posted on Nov 17, 2013

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Check the air/fuel mixture

Posted on Sep 06, 2010

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My car has white smoke coming from the exhaust


he causes of white exhaust smoke can vary; however, it is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke.
One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.
Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located.

Nov 17, 2016 | Cars & Trucks

1 Answer

I'm looking to purchase a used car. I've been doing online research and saw this webpage http://www.usedcarsmells.com . They talk about exhaust color and smells. Is it true that you could tell a lot about...


Yes this is correct, you can get important information from the colour of smoke from the exhaust:

Blue/Gray Smoke: Blue/gray exhaust smoke is an indication of oil burning in the combustion chamber. These are possible symptoms and causes:
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shuts down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder.
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Black Smoke: Black exhaust smoke is an indication of a rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe.

Jan 17, 2015 | Cars & Trucks

1 Answer

My 1998 Mazda millenia Is shorting white smoke more tell pipe what could be the problem


It is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke. One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.
Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located. THESE LEAKS WILL CAUSE SEVERE ENGINE DAMAGE! Have the car inspected immediately.

I
Internal coolant leaks can and will cause

Jul 30, 2014 | Cars & Trucks

1 Answer

Honda gx620 on golf cart occasionally bogs down & blows enormous cloud of white smoke from exhaust.gas getting in oil also.runs great until this happens


What ussually causes white smoke to come out the exhaust is oil being sucked up in carb. Typical causes are too much oil in crank case or PVC valve. Or really bad piston rings

Feb 26, 2014 | V-Twin Horizontal OHV Engine with Electric...

1 Answer

I have a 2001 nissan sentra with 217,000 miles but runs great still. I changed the oil myself and now when I drive my car down the road white smoke starts pouring out of the exhaust only when I am...


No water loss? If it's an automatic ,****** fluid also burns white.
Vacuum line to a control valve on the ******,find it and pull the hose off the trans. end ,if there is fluid ,the modulator is bad.

Oct 08, 2011 | 2001 Nissan Sentra

1 Answer

I have a 2001 Chevy 3500. Sometimes when I drive it white/grey smoke comes out the exhaust. Other times it drives normal. Any help


sounds like you have an injector going out it usually starts dumping excess fuel on occasion causing excessive smoke you will have to have it diagnosed to pinpoint the cylinder causing the issue

Nov 11, 2010 | 2001 Chevrolet Silverado 2500HD

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
OEM parts for Yamaha
YAMAHA TDR125 Owner Manual

May 16, 2010 | 2002 Yamaha TDR 125

1 Answer

Started the truck normally and engine bogged down when put into drive and lots of smoke came from exhaust and driver side engine... the smoke came from driver side of engine block under the air filter. Did...


sounds like you just blow out the head gasket,,, thats why you had so much smoke from the exhaust if you wip off the air filter and try to start up you may see puffs of smoke from under the cylinder head,,, dont drive it even if you could,,,untill you sort this out

Nov 15, 2009 | 2005 Ford F 250 Super Duty

1 Answer

White smoke from Exhaust


hardly likely the exhaust job would cause that, but yes it sounds like you got a blown head gasket. badl lock stricks hmm! also preasure test cylinder head for leaks

Jul 22, 2009 | 2005 Renault R5

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