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Honda cbr250 rr 50,000k hot climate but smokes white near blue when hot and leaves oily splashes out of the exhaust. Performance ok and not overheating on temp guage. Guy did ride it with fan off and it cut out because of this. Head gasget? rings? valve seals? Not using oil and water seems clean

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Rings and or valve seals need replacing.

Posted on May 20, 2011

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1988 Honda CBR 250 RR fuel pump not working


Hi, James_hume22 for this scenario you will need your service manual that has all fastener torque specs and a wiring diagram on the back pages, parts fiche, and owners manual if you can not find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one.
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How to change the radiator tube of a 1990 Honda CBR 250 RR@


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Honda xr single carb, single cylinder, twin exhaust headers - one gets hotter than the other


Most likely cause is bad valve clearances. but could be the valves need grinding in. If you do the valve clearances you will probably increase the bikes' performance in terms of both power and economy.

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1991 Honda CBR 250 RR choke won't work@


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2 Answers

My mazda 626 has a strong potent smell coming from the exhaust


You don't mention what that smell is reminiscent of?

You don't mention the colour of the "smoke" and you didn't say whether the engine is petrol or diesel?

You don't mention whether the road behaviour/performance is normal?

White smoke is almost always steam or in the case of a diesel it could be an unburned fuel mist, grey/black is excess fuel and blue or grey/blue is burning oil.

Some steam is fairly normal until the engine and exhaust system is hot but excessive amounts could be one symptom of head gasket trouble. If the engine is drinking coolant and sending it through the exhaust as steam it will sometimes smell spicy.

Burning oil smells a bit like burned eggs in the frying pan.

If the car hasn't ultra-low sulphur oil and fuel the catalytic converter will convert sulphur traces into hydrogen sulphide - the bad egg gas...

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1 Answer

2005 Honda CBR 600 RR smoking


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. COLORLESS OR SLIGHTLY BLUE SMOKE on start-up means your air/fuel mixture is the right composition and everything is well burnt in your combustion chamber.
2. BLUE SMOKE on startup is usually caused by failed valve seals dripping oil into the combustion chamber when the engine is not running.
3. YELLOW OR BROWNISH SMOKE at start-up means your air/fuel mixture is too lean. Too lean means that there is low fuel but high air mixture in your combustion chamber.
4. WHITE SMOKE on startup may be caused by a blown head gasket allowing coolant to enter the combustion chamber and may start dripping out of the exhaust pipes or mufflers. Smoke while riding is usually caused by worn out or damaged valves, seals, guides, pistons, rings, or cylinder walls.
5. BLACK SMOKE on startup 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 or not in the off position, air filter dirty and clogged, 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 or a damaged carburetor.
It should be noted that aggressive or abnormal throttle operation will cause these conditions to manifest themselves exponentially.
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1 Answer

Exhaust smoke when warm up. smoke when throdle hard


what color is the smoke ? if it is blue white , you're burning oil , due to bad rings, worn valve guides or bad valve guide seals. if it is black, you have a carburetion problem, as it is running too rich. however , since it does it when it warms up I would suspect rings or valves.

Mar 13, 2010 | 2005 Honda CBR 1000 RR Fireblade

3 Answers

I just bought a used 2002 honda cbr 954 rr. i cleaned the spark plugs about a month ago and it started up and ran fine. but now i cant get it to run no longer than a few seconds. any ideas what the problem...


Was the bike running fine before you cleaned them? If your bike won't stay running, you might need to adjust your idle. There is a black round dial on the left side next to the stator (big round circular housing) turn it so the fuel is increased.

Jan 11, 2010 | 2002 Honda CBR 954 RR Fireblade

1 Answer

Having trouble with my honda 2001 cbr 929.black/gray smoke coming out of exhaust pipe


There are several possible causes; fuel mixture is too rich, air filter is clogged, or worn piston rings and/or valve guide seals. The latter, however, will most likely produce blue smoke - under acceleration means worn rings, blue smoke under deceleration means bad valve guide seals. Also make sure that the crankcase vent is not obstructed as this will tend to force oil up, past the rings and into the combustion process.

Generally, an examination of the spark plugs will give you a good clue as to what the offender is. Black, sooty spark plugs indicates too much fuel (clogged air filter or mixture too rich). Oily spark plugs means worn engine parts, as mentioned above.

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1 Answer

2005 CRF250R motor rebuilt but smokes blue


You know what they always say about the color of smoke... blue is oil, white is water and black is  i don't know lol.   Anyhow, if it was just recently rebuilt and you're getting blue smoke then oil is making it into your pistons OR you are burning off oil somewhere when it gets hot.  If you are seeing the smoke from the exhaust only, then think about piston rings, head gaskets, all the typical stuff that gets replaced on a rebuild.  It's near impossible to say exactly where to look so that's the best I can tell you.  I would lean more toward the piston rings.
Good Luck

Jun 10, 2009 | 2005 Honda CRF 250 R

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