Question about 1974 Yamaha XS 650 A
IT HAS FUEL TO CARBS HAS POWER TO COILS, CHECKED KILL SWITCH, AND KICKSTAND SWITCH AND FUSES, ALSO, REPLACED ONE COIL AND BOOT JUST TO MAKE SURE, IS THERE ANYTHING ELSE BESIDES THE CDI UNIT THAT I CAN CHECK. BEFORE SPENDING$$$$ I HAVE NO SPARK COMING OUT OF COILS, BIKE HAS SAT FOR ABOUT 6 MONTHS AND RAN WHEN HE PARKED IT, THE BATTERY IS FULLY CHARGED.BIKE ONLY HAS 11,000 MILES. WHEN TAKING IT APART THE REAR CYL... PLUG WAS BLACK IE LOOKED FOULED LIKE A TWO STROKE, AND THE FRONT CYCLINDER LOOKED LIKE IT WAS NOT FIRING AT ALL. WHITE ELECTRODE.
1. #1 test. Obtain a 12 volt circuit tester, the type that looks like an ice pick with a wire coming out of the handle. With ignition on, hold the tip of the circuit test against the post of the coil, the post that is marked with a + The light in the tester should light up, meaning you have battery power. If you don't have electrical power there, trace back to battery to find out why. If you do have power at that point
2. Moving the the opposite side of the coil and place the tip of the tester again the post marked with a minus. With the key on, crank the engine. The light in the tester should flash. These 2 test have just tested your battery and ignition system. Bill
Posted on Nov 19, 2008
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Posted on Jan 02, 2017
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