Chane slack how do i tighten my chain

The above solution is incorrect. The vfr has a single sided swinging arm and no notches on either side of the arm. The axle nut is loosened and then a special tool is used to move the wheel back to tighten the chain. The special tool is like a c spanner and comes in the bike tool kit. If it is missing i think they are about £8

Slacken the wheel nut a couple of turns ,then simply adjust tension with the chain adjusters at the rear of the swingarm legs. Look carefully you will see notches marked on both sides of the swingarm by the wheel spindle these must be the same on both sides, your manual will tell you the chain slack for your bike.probably about 25-35mm put a ruler up to the chain and using finger pressure push up on the chain ,this is the chain slack. Once done tighten the wheel nut up to correct torque setting.( manual or call local dealer),then replace split pin with new through the wheel nut. Double check all your work no loose nuts,then sit on the bike get a friend to wiggle the chain there should be small slack as first meashured 25-35mm again, if not re-try,once experienced you will do it first time.