Question about 2011 Honda CBF Stunner
Hi, I bought the Stunner CBF bike 4 years ago. It was fine up to 40,000 km. And after 40,000 km its starts to smoke. So I replaced the ring and piston with original parts but it didn't work well and still smoking and again the technician open the bike and they said that it is the piston problem and they said that it should be replaced but not with the original parts and they replaced the ring and piston with 50mm size of Mahal brand. I have replaced all the parts like ring, piston, valve and other supporting parts but still my bike smoking when I accelerate above 60km/h. When I ride bikes in hilly areas with my friends behind them, pick up is very less and the bike smokes blue. My silencer gets wet and when the bike cools down then the silencer gets dry. When I check the engine oil it is fine up to the mark of the leveler. So I am confused what is the problem. For 8 to 10 times I used Sarvo, Enoc and Zic engine oil. Now I am using Honda engine oil in a gray bottle pack. The technician said that the parts of Honda are not good enough as before. These are all made in China so that is why the problem occurs. So that they replace the Mahal brand ring and piston. Now my bikes traveled nearly 50,000 km (49,800 km). And one thing I didn't give my bike to the showroom for the replacement of ring and piston. I gave it to the reputed technician in town. I think this time I will get a proper answer for my problem. Thanks
Hi, Bibek 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 at 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/enrichner 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.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the links below. Good luck and have a nice day.
How to Fix Blue Smoke From Exhaust in Under 1 Hour
Blue Smoke Problem Wheeler Dealers
Honda Cbf 125 Service Manual
Honda CB Owners Manuals
Posted on Sep 25, 2017
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Posted on Jan 02, 2017
It all seems to be leading to fuel starvation. Have you checked the tank breather is not blocked which can be a small hole in the petrol cap or a tube from under the tank. It could also be a blocked fuel filter. There should be two. One inside the fuel tank under the petcock, another before the fuel pump. Here is the workshop manual where you can find all info you will ever need for this bike.
Hop this has been useful, rate me if it has...?
Thanks and good luck.
Posted on Apr 24, 2009
SOURCE: Misfiring 2007 Honda VFR 800
I would say that your bike may be running a little lean. I usually replace the jets on all my bikes as soon as I get them as the emissions requirements mandate that the manufacturers pass stringent emissions tests prior to the dealer selling them. Some bikes wont even idle or run, especially off road bikes from places like California. and in these cases you must re jet it is a must! I even throw away or drill larger holes into my air cleaner cover.
Posted on Sep 22, 2009
If it ain't broke, don't fix it. If the bike has adequate power just go ahead and ride it. Chances are it will get better from use. The rings are probably sticking in the ring grooves creating the low compression. A shot of WD-40 in each spark plug hole, left sitting overnight may help the free up the rings. The brand of oil does not matter much. Just be certain to NOT use synthetics or oils with "Special" additives. They can swell or shrink the cork on the clutch friction plates. Now you need new plates.
Posted on Nov 01, 2009
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