Posted September 21, 200915 yr hi i have recently had my yamaha brake down on me i was riding along and then all of a sudden the power completely went i found this was the main fuse from the positive on the battery i changed this and got power back but now i have no spark i have checked the spark plug and the coil both are fine i was woundering if anyone has any idea what else to check or if anyone knows any common faults also if there is a way to check the cdi unit as it is a sealed unit thanks.
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