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My suzuki vl 125 sometimes will not start .i have removed the spark plugs and cranked the engine and noticed the absence of a spark ,i can try again after a period and it starts.could it be a faulty E C U unit
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Remove lh cover from air filter ( chrome cover) and spraysome easy start into the housing while turning the engine over, you could also soak a cloth in fuel, and hold it in the ail filter housing with filter removed, this way when you attemt to start it the fuel on the cloth will enter the engine and hopfully your bike will start, quickly remove the cloth or the engine will flood, if the bike starts hold the throttle at a steady 3000rpm for a miniute or two, until the bike will idle if your bike runs then stops after this, you may try draining the fuel from the carb by undoing the screw at the lowest point of the carb, let it drain completely, in severe cases you may have to remove and cleanout carb
When was the last time the valves were adjusted? Valve adjustment affects more than compression but vacuum as well and should be checked... A lot of rider never check it until they have a problem like this, and it gets worse when it is colder outside.
Check if you have gas?, see if the fuse is shot, should be on the bottom side of the gas tank, could be just a faulty spark plug, worse case scenario the pulse coil is shot or the stator
as with any problem you need a clymer book for your bike or you can disconnect the wiring harness(all of them one at a time)turn the key on and use a volt meter to make sure you are getting power.does the engine turn over?
Do you have fresh gas in the bike? Try changing the plugs with new ones and check for spark. You can do this by putting the new plugs on the plug wire and grounding it to the head on the engine crank the motor over you should see a bright blue spark. Check one plug at a time. No spark check the ignition wires and coils. As for the oily plugs it could be they are just fouled caused by either flooding the motor while trying to start, bad plugs, week coils, bad gas, poorly adjusted carb's. I would start with the plugs and work my way back to the carbs. Still fouling the plugs after all that start checking the engine, ie compression check ect.
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