2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 15Get this manual
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CHAPTER TROUBLESHOOTING STARTING FAILUREHARD STARTING .9-1 FUEL SYSTEM 9-1 ELECTRICAL SYSTEM.9-1 COMPRESSION SYSTEM 9-2 POOR IDLE SPEED PERFORMANCE 9-2 POOR IDLE SPEED PERFORMANCE.9-2 POOR MEDIUM AND