Those symptoms sound like the RPM-limiter problem the Raptor 660R's sometimes have. The reverse light comes on at the point the rpm limiter cuts spark to prevent over-rev. I believe this happens on the 660R when you have the parking brake on or when the system incorrectly thinks your driving in reverse. I would check the parking brake and reverse sensor/sender/switches. If my diagnosis is correct, the solution will be a quick, inexpensive fix once you find which sensor, or its connection, is the problem.
"Jerkyboy" and "Fire Raptor" on this forum each experienced this problem on their 660R Raptors.
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2004 Yamaha YFZ450
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