Occasionally my bike has black smoke and is a little difficult to start. It happens everyday that I ride but not everytime I start the bike. At times when starting, the fuel pump runs for several seconds.......when this happens the bike will have to turn over several times before starting. This is when the black smoke is observed. Carb and air systems have been cleaned and checked. First time this was done it ran great for 3 days with no smoke and was easy to start. Second time fuel and air system was cleaned it ran great for a week and the problem came back. All of this has occured in the last few months. My mechanic has talked to Suzuki several times and so far no luck. Any ideas?
Black smoke is indicative of carbon or incomplete combustion caused by either poor ignition (weak spark) or too much fuel (choke setting). Check out these areas.
SOURCE: carb or manifold or exhaust problem hellllppppppppp
You have an air leak on the intake side of the motor. Get new carb and carb manifold gaskets. Tighten the bolts down evenly in three stages. For the exhaust, try the link below. It is a high temp silicone sealer.
high temp silicone (red)
SOURCE: why wont my suzuki bandit 250 start?
If you tried to start the engine for any length of time, the plug would be damp and smell of petrol because fuel was being drawn into the combustion chamber. Without spark to ingnite the mixture, it would cause the plug to become damp. I am assuming you fitted the correct spark plug and that it is gapped correctly.
I don't mean this to sound foolish, but I would suggest you make certain the emergency kill switch has not been accidentally switched off. Also, if you have a sidestand safety interlock that prevents the engine being started while the side stand is down, flip up the sidestand and try again to start it.
Additionally, to make sure the plug wire is securely fitted to the plug. It is possible that the inside of the plug wire cap has gathered moisture and may need to be wiped dry.
If none of the above suggestions solve the problem, remove the plug then reconnect it to the plug wire and hold it near the cylinder - but not near the plug hole in the cylinder head (fuel vapors) - while pressing the starter . You should see an obvious spark. No spark likely means the coil is faulty.
SOURCE: Rear Carb leaks fuel out of the overflow tube 1995 Suzuki VS 1400 Intruder
Hole in the float. It fills with gas, sinks and fails to stop the fuel flow
SOURCE: 1994 suzuki quadrunner 250 is having a problem running
id start by getting a set of feeler gages and set the tappets up and try that , also check compession
SOURCE: 1998 suzuki gsxr750 fuel pump inop after replacing filter
You cannot bleed the fuel injection system.Test the pump alone (not on the bike) for sufficient fuel supply.Also check the fuel pump relay.
If all that is ok next time you try to crank the engine (only with kill switch on, the fuel pump primes up) with lifted tank and opened air box, spray a bit of carb cleaner spray towards the throttle bodies.It will help.
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Hi Wayne, I want to help you with your question, but I need more information from you.
Usually, the color of the smoke indicates the root of problem... Black/Purple smoke indicates oil burning from within the piston chamber. Black smoke also indicates a rich fuel mixture. White smoke indicates a lean fuel mixture or moisture getting in the system. Cleaning the components was a step in the right direction since lower grade fuels tend to have more impurities/build-up.
Did your mechanic check the compression?
Is the smoke just black or does it have a hint of purple?
Does this happen when the engine is at normal operating temperature?
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