A chain adjuster is a device to adjust the chain tension on a motorcycle.
Left side by chain there is a large adjuster screw
It has an automatic adjuster on it. The issue comes when it becomes extended as far as it will go and the chain becomes loose and wears against the inside of the motor.
To tighten the chain on a 1987 Honda FourTrax, first, place the ATV on a level surface and elevate the rear with a stand. Loosen the axle nut and the two lock nuts on the chain adjuster bolts. Turn the adjuster bolts evenly on both sides to achieve the desired chain tension, ensuring the chain has approximately 1 to 1.5 inches of slack. Once adjusted, re-tighten the lock nuts and axle nut securely.
To properly adjust the rear dropout adjuster screws on your bicycle, first loosen the axle nuts on the rear wheel. Then, use a wrench to turn the adjuster screws clockwise to move the wheel back and tighten the chain, or counterclockwise to move the wheel forward and loosen the chain. Make small adjustments and check the chain tension until it is at the desired level. Finally, tighten the axle nuts securely and test the bike to ensure proper alignment.
As far as adjusting the chain goes, to the right of the rear sprocket there will be a large concentric adjuster with slots in it. You'll have to loosen the two 6mm Allen head bolts on the swingarm just to the right of the adjuster. Then use a small wrench [turned sideways] and slip it in the slots of the concentric adjuster. If you push it forward, the chain gets loose. If you pull it back, the chain gets tight. You want to have about about 1 1/2" of play [up and down slack] in it when finished. Then tighten the Allen head bolts and you're ready to go !!
Loosen the axle nut and rotate the chain adjuster to the same position on both sides of the swingarm until you obtain the correct chain slack, then tighten the axle nut.
loosen the clamp bolts on the adjuster assy and rotate the whole axel using a pipe wrench, when your chain is properly set re tighten clamp bolts.
There should be 4 bolts on the back between the brakes and the sprocket, the top two will have slots that should be of equal distance once finished.Loosen all 4 bolts then take the jam nut loose at the chain tension bolt This bolt should be on the same side as the sprocket and chain. Turn the tension bolt clockwise until the chain has about 1 1/2" of slack in it. Tighten everything back up and you should be good.
To tighten the chain on a 2003 Polaris Predator 500, first, lift the rear end of the quad to relieve tension on the chain. Locate the adjuster bolts on both sides of the swingarm and loosen the axle nut. Turn the adjuster bolts evenly on both sides to achieve the desired chain tension, ensuring it has about 1 inch of slack. Once adjusted, re-tighten the axle nut and check the tension again before lowering the quad.
Some Stihl chain saws have an adjuster underneeth the saw to turn up the oiler .
I worked for a year and a half as a contractor Carmen on the bnsf. A slack adjuster is a threaed rod with adjusting nuts on the threaed portion that can adjust for proper tension on the brake rigging with includes rods and a chain and an air billow and brake shoes pressing up against the wheel.this slack adjuster must be properly adjusted for the brakes to work correctly.
To tighten the chain on a Honda 3 wheeler, first loosen the rear axle bolts then turn the adjuster nuts clockwise to tighten. Finish by tightening the rear axle bolts.