The chain on a Yamaha YFZ450 should be adjusted to have a slack of about 1 to 1.5 inches when measured at the midpoint between the rear axle and the swingarm. It's essential to ensure that the chain is neither too tight nor too loose, as excessive tension can lead to premature wear on the sprockets and bearings, while too much slack can cause the chain to derail. Regularly check and adjust the chain tension to maintain optimal performance and safety.
From the middle of the 2 sprockets you should have about an inch of slack or play in your chain when you lift up on the bottom of the chain with your finger if it looks a lot more then that adjust it but you don't want it to be too tight.
When adjusting a chain on a bicycle, it should be tight enough to not sag or come off the gears, but loose enough to move smoothly without causing excessive wear on the gears or chain.
The garage door chain should be tight enough to prevent sagging but not too tight that it strains the motor. It should have about 1/4 to 1/2 inch of slack for optimal performance and safety.
You need to start by adjusting the middle chain . At the front of the center chain is an eccentric , loosen the two bolts and rotate it to tighten . should be as tight as you can get it . After you do the center then you do the front .There is an eccentric for the front chain also . It should be as tight as you can also .
You should be able to move the chain up and down aprox 1/2" with your fingers.
A bike chain should be tight enough to prevent it from sagging, but not so tight that it causes excessive wear on the gears and chain. Optimal performance and longevity are achieved when the chain has a slight amount of slack, allowing for smooth movement without putting too much strain on the components.
yfz450
it should have 1 inch to 3/4 inch slack in it
a stock yfz450 goes about 75 mph
they keep your chain tight
yfz450 nerf bars fit banshee
Half inch to an inch of slack in the middle is just right.