Install new spark plug and still no spark
There could be many issues causing no spark on a 04 GSXR750. Check for battery voltage on the orange/ white wire at each coil. If none this model has a history of a failed right hand handlebar switch and or connector. Ignition voltage passes through this switch. Also check the main harness connector under the left side fairing panel near the area of the turnsignal for internally broken or corroded wires. If all this is good check the signal generator(crank position sensor) output voltage with a "peak reading " voltmeter. This is a special type of meter or attachment that must be used. The voltage should be 3-7 volts DC at cranking speed. Good luck.
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