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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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Engine concern


Smoke (blue or black) or steam (white)? White smoke is really steam that is caused by water leaking onto hot surface. Could be leaking from hose running to heater coil under dash, or something else. Check radiator water level to make sure water level is ok. Blue smoke is oil burning. This could be dangerous, caused by similar scenario of oil leaking on a hot surface (from a gasket leak, etc), or exhaust fumes. Black smoke means something is actually burning and could indicate fire. Black or blue some could fill vehicle cabin with toxic fumes, even if you don't smell anything bad.

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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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When I start my 2003 ES300 smoke comes out the exhaust


The same thing happened to my 2003 ES300 - the smoke is coming from the oil seeping into the motor's cylinders. This is the classic "Oil Gelling" problem in Toyota and Lexus vehicles. There is a factory recall on it, but it only covers to 2002 ES300 not 2003. The Lexus dealer confirmed my "oil gel" problem and went to bat for me with Lexus - they got the repair approved - Thank you Mr Local Lexus Dealer! The cost was nearly $4,000 - paid for by Lexus.

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Exhaust pipe comes out white smoke when start bike on side stand


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

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.

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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

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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.

Oct 27, 2009 | 2001 Honda CBR 929 RR Fireblade

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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

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2 Answers

When truck gets warm it will not run over 45 mph


Puffing white smoke is a sign of a blown head gasket. Coolant is getting into the cylinders.

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Whaite smoke at idle


honest advice. I recently obtained a 1984 RR 250. It has 19000 on the clock. I replaced all the obvious components like battery plugs oil filter, sealed tank, cleaned petcock. It starts up and runs smooth too. My problem is this..... ... Whenever I start the bike, especially after its been sitting (say overnight) and even more so when Its colder outside, it releases a grayish white smoke from the exhaust. It almost smells like an old gokart or something. It will eventually dissipate, but i can still see faint smoke. Usually if its colder outside, it hardly goes away at all. So what gives?? Is it bad valve stems? Bad head gasket? Cracked valve head? Bad piston rings? Im really stumped, and I would like to fix this myself (even though ive never been inside of an engine but I learn fast! especially being a biochem major!). Id rather not get the shaft from the two local stealerships/mechanics. IF anyone has any knowledge of or experience with this problem I would appreciate any input you may have. Thanks very much,It's normal for white smoke to appear out the exhaust in colder temps - there is a small amount of water present in gas that gets burned in the combustion process and is released as vapur, or white smoke, out the tailpipe. Other causes of white smoke are blown head gaskets on liquid cooled bikes - but as yours is air cooled, this obviously isn't the problem. Next time this happens, check the outlet of the muffler closely... if you see lots of water droplets coming out with the smoke then I'd suspect cheap too low octane of a fuel. Try a higher octane to see of the problem goes away. White smoke can also be caused by unburnt fuel. If a spark plug is erratic in operation (ie: misfiring) it can fail to ignite the fuel/air mixture in the cylinder under compression forces and shoot it out the exhaust valve as white smoke. One other cause is the engine running too lean. As your bike is fairly old, I'd check the condition of the carb rubber intake boots. If they are cracked, this can allow air to get sucked in and lean out the mixture, causing white smoke. Another clue to a lean engine is that it will run very hot and the headers/exhaust pipes will turn a deep blue.,,,

Nov 10, 2008 | 2006 Beta RR 250

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