Yamaha 150 2005

Engine starts and idles fine. When I run at full throttle after about 30 seconds the rpm's drop from 5000 to 4000 and the speed drops from 50 mph to 40 mph. It will stay there for about 10 minutes and the it happens again the rpm's drop to about 3800 and the speed drops to about 38 mph. Any ideas before I start spending money??

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