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2007 cbx 250 twister bike smoke when it idel , i replaced valve stem seals but still same problem is it possible that it can be the type of petrol (93 unleaded)in use in the bike.a new head gasket was replaced.
If the head was damaged would it cause the bike to smoke the bike have over 4000km om speedometer thanks
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OK, since you didn't mention a make model, year or number of cylinders this is just an old mechanics take on the situation. Blue smoke on deceleration (closing the throttle) is because of high vacuum in the cylinder pulling oil past either the piston rings or valve seals. Usually, blue smoke on a cold start is caused by the valve seals leaking into the cylinder while the bike is sitting. A quick check to see if the piston rings are at fault would be either to come down a long steep hill or accelerate hard then close the throttle, if it emits a sizable amount of blue smoke when you open the throttle again, the rings are most likly at fault. The oil getting black is it doing it's job of keeping the engine clean, and the oil consumption you mention would not necessarily be cause for concern on an air cooled engine, especially in a warm climate. Is it possible this condition existed before all this work was done? If so, I'd suspect a carburetor problem, an over rich mixture, possibly because of a faulty float valve or the float itself contaminating the oil with raw fuel, especially if the bike is left on the side stand without the petcock being turned off. To sum things up, a leak down test will show the condition of the rings and valves. Also might mention that if newer type (usually blue or green color) valve stem seals were used, there is a special procedure for installing them not all mechanics are aware of. The valve must be put in the guide first and the seal worked over the stem with the thumb then it can be tapped down onto the guide. Hope some of this helps, Frank
it sounds like it is burning oil not petrol but you will smell petrol as the oil is leaking in through the head, the valve stem oil seals will most likely have gone, very common on fords. they are very cheap bt unfortunately you have to remove the cylinder head to replace them so that means a head gasket and a new cambelt and head bolts thats where it gets expensive. in the UK you are looking at about £300 to £500 in a general garage.
there is another solution that will last for months if not years, get some STP the type that you need to heat up to get it to come out of the can, this will seal up the leaking stems and shuld stop the smoke, most people do this before they sell that car.
Valve stem oil seals often go because the car has been driven hard, but you should still expect them to go at around 80-100k miles anyway.
Your valves are adjusted backwards. Most Honda's will use: IN = 0.10 mm ( 0.004 in ) and EX 0.12 mm ( 0.005 in ) A simple adjustment should take care of the problem.
Your best bet is to custom make or adapt other parts to your bike. the best way if you are not used to doing this is to pic up a cheap parts bike that is more like where you want you bike to be when you are complete and start swapping and adapting parts till you start getting the results you want!
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