SC 90 Just won't run.........
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My sons Sc 90 will start and run about 10 to 15 seconds than dies and won't start again. I have checked the crankcase to see if it is full of gas and it is not, tried cleaning the carb to make sure the needle isn't stuck open, am at wits end. Junior is going to kill me if I don't get it fixed soon. Any help is greatly appreciated.[img]i/expressions/face-icon-small-confused.gif[/img]
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Here is an easy way to check the fuel issue. Locate the pink fuel drain line on the bottom of the float bowl. If it is missing go to a hobby store and get a piece of line for the small RC cars. Take the fuel line and hold the open end just above the top of the float bowl. With the fuel line being held up, open the bowl drain screw about three turns and watch to see the fuel enter the fuel line. The level of the fuel in the line will be the same as the level of the fuel in the bowl (as long as your fuel petcock is on).
If the fuel level is OK, go ahead and start the engine. Watch to see if the fuel level drops just before the engine dies. If it does, you know you will need to service the fuel delivery system. Start by removing the gas cap and trying the above test again.
If fuel is NOT the issue (I suspect it is fine), get an inductive timing light and connect it to the coil high tension lead. Watch the light as you start the engine. If the light goes out as the engine dies, the problem is in the ignition kill system. (I can help with this issue later.)
If all of the above is OK, move to checking the head gasket. These machines are well known for leaking head gaskets. It will start but run lean seconds later and die. Pull the plastic cylinder cover and inspect the area between the head and cylinder. If you see any attached dirt or oil, your gasket is done. Get a new gasket and properly torque the head.
There you go "DUDE"
If the fuel level is OK, go ahead and start the engine. Watch to see if the fuel level drops just before the engine dies. If it does, you know you will need to service the fuel delivery system. Start by removing the gas cap and trying the above test again.
If fuel is NOT the issue (I suspect it is fine), get an inductive timing light and connect it to the coil high tension lead. Watch the light as you start the engine. If the light goes out as the engine dies, the problem is in the ignition kill system. (I can help with this issue later.)
If all of the above is OK, move to checking the head gasket. These machines are well known for leaking head gaskets. It will start but run lean seconds later and die. Pull the plastic cylinder cover and inspect the area between the head and cylinder. If you see any attached dirt or oil, your gasket is done. Get a new gasket and properly torque the head.
There you go "DUDE"