My Yamaha YZF R15 is accelerating very slow and sluggish, what to do?
Please check the following things for low acceleration and sluggishness:
• Check fuel for no adulteration / contamination. If suspected replace fuel.
• Air filter might have clogged.
• Wheels are not freely rotating.
• Breaks are tight.
Hope by working on above suggestions problem will solve, if not then we advise you to take your bike to your local Yamaha service center.