Question about 1995 Yamaha FZR 1000

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What is the most likely cause of blue smoke from the exhaust on the over run? A. the non-return valve sticking B. the oil pump is worn C. the piston rings are worn D. the valve guides are worn ?? This is a general question and not an actual problem. Hence no bike details.

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C. Worn rings.

Posted on Sep 02, 2010

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3 Answers

Is it bad to drive my 2006 Malibu with blue smoke from tailpipe


That could be a sign of a blown head gasket check and make sure the car is not over heating if so that may be the case.

Apr 20, 2017 | Cars & Trucks

1 Answer

Can too much oil cause blue smoke?


Hi, Michael most definately and the usual suspects are:
1. Oil tank/pan overfilled.
2. Restricted oil return line to oil tank/pan.
3. Restricted breather operation.
4. Restricted oil filter.
5. Piston rings badly worn or broken.
6. Valve guides are worn and or seals worn, crushed, missing, or have come of guide and is pumping oil through the valve guide.
7. O-ring damaged or missing from oil pump at crankcase junction (also results in poor engine performance). For more information about your issue, please visit the websites below. Good luck and have a nice day.
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2 Answers

What could cause blue smoke from exhaust?


blue smoke is burning oil
I gather that you let the engine idle and when you give it rpms that there is a cloud of blue smoke
if that is the case it indicates that the valve stem seals are hard /failed and when the engine is at idle ( 15" mercury vacuum in manifold) the oil around the valves is sucked past the stem seals and into the combustion chamber
AS you have restricted use of the machine (every 3 weeks ) it is not a great problem as when you are on the road it is not happening (Only at idle )
It is repairable without removing the head if you find an accredited service shop that has experience in the procedure.

Jul 06, 2015 | 1989 Mercedes-Benz 300-Class

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

2 Answers

Why is my 2000 kia sephia blowing blue smoke from the tailpipe. it has 86,000 miles. the check oil warning light is on even though the dipstick reads full.


The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.

Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure.

Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.

Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.

Dec 08, 2014 | 2000 Kia Sephia

1 Answer

Smoke from exuest


Exhaust smoke from an air-cooled engine will either be oil or excess fuel. On an Innova it will be oil as the engine will not run with a fuel mixture rich enough to show unburned fuel in the exhaust
Oil smoke is generally caused by worn piston rings or worn exhaust valve guides.
Worn piston rings will show smoke all the time the engine is running. Worn valve guides will generate a puff of smoke after the throttle is re-opened after it has been held open for a while and then shut off.

The only cure is to replace the worn components and that may include a new piston/cylinder assembly as on these bikes, a re-bore is more expensive than replacement.

In both cases the engine wear is because the engine oil used failed to deal with the heat of the piston rings and/or valve guides, The usual reason is that the engine was used hard, the oil wasn't of good enough quality to deal with the heat, and broke down around the engine's hottest parts.

If you are going to abuse any small engine, use a (non car brand specific) fully synthetic oil like Amsoil 0w-40, Mobil 1 0w-40 or similar.

Jan 25, 2014 | 2006 Honda ANF125 Innova

1 Answer

Hi my yamaha jog -r is smoking really bad any ideas why


Hi, Mad_racer and the usual suspects are:
1. Oil tank/pan overfilled.
2. Restricted oil return line to oil tank/pan.
3. Restricted breather operation.
4. Restricted oil filter.
5. Piston rings badly worn or broken.
6. Valve guides and or seals worn, crushed, missing, or have come off and are literally pumping oil through the valve guide.
7. O-ring damaged or missing from oil pump at crankcase junction (also results in poor engine performance).
8. Auto-Lube not properly adjusted.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Jun 18, 2011 | 2006 Yamaha Jog R

3 Answers

What are the possible causes of smoking from the exhaust? My car is a Toyota AE 11O, year 2000


what colour smoke ?? blue smoke is oil ,worn rings or valve guides ,or oil seeping into cylinder where oil passes through head gasket to lubricate cam ,white smoke is water ,head gasket ? black smoke is excess fuel

Sep 03, 2010 | 1988 Toyota Corolla 4 Door

2 Answers

Blue smokes come out tailpipe when i start the car but stops afte


Helllo there
Symptom: Gray or blue smoke from the exhaust. You notice gray smoke coming from the exhaust when you start your car. The smoke may or may not disappear after the car is warmed. If it is, it is less noticeable. The smoke may have a bluish tint to it. Possible causes:

  1. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  2. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)
  3. Damaged or worn valve guides.
    The Fix: Replace valve guides. (Not a DIY job)
Symptom: Engine uses more oil than normal, and there is some smoke from the exhaust. The oil level is low between oil changes. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may or may not notice the engine doesn't have the same power as it used to.
Possible causes:

  1. The PCV system is not working properly.
    The Fix: Replace PCV valve.
  2. The engine may have mechanical problems.
    The Fix: Check compression to determine engine condition.
  3. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  4. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)

Jun 01, 2010 | 1989 Buick Electra

1 Answer

2005 yamaha ttr125et has blue exhaust smoke


Blue exhaust smoke means one thing: crankcase oil getting into the combustion process. The most likely cause is worn piston rings. Other possible causes are worn valve guides or a blockage of the crankcase vent. Tip: blue exhaust smoke under acceleration = piston rings. Under deceleration = valve guides.
Also make sure someone did not put a gas/oil mixture in the fuel tank by mistake (thinking it had a two cycle engine).

Nov 01, 2009 | 2005 Yamaha TT-R 125 L

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