SOURCE: 1983 Yamaha Seca 750 no spark
Check the battery should be 12V or more , Then check the coils the connections are under the gas tank make sure they are securely connected.
What kind of fuse box do you have? The glass fuses? Or did you replace the fuse box. If it is the glass fuses you need to replace with a new fuse box.
Check the kill switch and the side stand switch.
Check the coils too..
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