I need to tighten my chain

loosen rear tire pull back and tighten when chain slack is removed

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Easy answer? Check you tire inflation.

More complex? It could be a number of things starting with your chain too tight. Have someone hold the back of the bike up and turn the crank to see if it turns easy. Take note of the chain; at some point when turning slowly you should see it/feel it loosen. If it seems really tight undo your rear axle bolts and adjust the chain so it has about a quarter inch of slack. Make sure that the wheel is centered before you tighten the bolts back down.

This also could be a problem: the back wheel wasn't secure and it is rubbing on the frame. Center the tire between the frame and tighten the bolts.

If all that is OK then it could be bad or over tight bearings.Then it is really bike shop time.

There should be no slack!, add tension until there is no noise when hot, or no play when loose. Do not over tighten it. with manual tension-er once it stops back it up and tighten the jam nut

No it doesn't need to be off the ground.

But, remember that when you are sitting on the bike and the suspension is compressed there is less slack in the chain, so don't tighten the chain too much. Tighten it until you have an inch and a half / 3-4cm of slack in the mid point of the chain between the front and rear sprockets.

There are usually marks on the tension bolt brackets. Adjust each side until they are even and the chain has about a 1/4 inch to a 1/2 inch of slack in either direction at the chains longest span. Tighten the axle bolt securely and take it for a ride. Thanks for checking out Fixya.com Scott. I hope this helps you. Love them dirt bikes.

The first step is to find the tightest part of the chain. Unless it's a brand new chain it will have a tight spot somewhere on it. It's easiest to do this with the bike on a race stand if you have it. Rotate the wheel and observe the lower part of the chain and watch it lift up when you hit tight spots. The spot where the chain lifts highest is the tightest part of the chain. Once you have found this spot, grab the chain on the low side under the swingarm and move it up and down. It should move up and down around 30-35mm or so, or an inch and a bit if you're an imperialist :) If the chain moves more or less than this then it needs to be adjusted.

To adjust the chain, you need to loosen the axle first. Don't take the nut off but it has to be loose enough to undo by hand. Using 2 spanners, unlock the lock nuts on the end of the swingarm and wind the nut in or out until you get the correct amount of chain slack. always do the sprocket side (left side) first, then repeat the same on the other side. Check the chain adjuster marks to make sure that the adjusters are equal on both sides, this will make sure your rear wheel is aligned properly.

Once you have adjusted the chain, tighten the rear axle and check again. The chain slack will change slightly after you tighten the axle, it might go tighter, it might go looser. Depends on the bike. But the chain slack must be correct with the axle tightened. A bit of practise here and you will be able to guess the correct amount before tightening the rear axle.

Once you have the slack set correctly and the axle is tight, make sure to tighten the adjusters. Tighten the front nut first against the swingarm plate so it can't move. Do it tight but not crazy tight. Then holding the first nut so it can't move tighten the locknut against the first nut. Repeat this on both sides.

If you are not quite sure if the chain is right, always err on the side of making it too loose rather than too tight. Running your chain too tight can destroy your output shaft bearing. It's only about $30 or so for a new one but your engine needs to be completely stripped down to replace it, it's not a fun job. I have seen a lot of FZs and FZRs have this problem because people ran chains too tight. If your chain really is too loose then it will start making your gear changes harder to do, that's the sign you need to tighten it.

Generally there is a screw or screws on the back or somewhere to tighten the chain within a certain inch wise range.

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.

1. Place your Rex a center stand or rack.
2. Referring to the Owner's Manual, inspect the chain and sprocket for wear. Replace if necessary.

(Whenever replacing a bike chain, you should really replace both sprockets at the same time, too.)

1. On both sides of the bike, loosen the large vertically-mounted hex bolts at the very top back of the swingarm.
2. Noting the alignments marks on each side, place an even larger hex wrench into the side of the circular aluminum insert that's surrounding the axle.
3. Use the wrench to adjust the chain to about 0.9" (~23MM).
4. Make sure both side's alignment marks exactly match each other.
5. Tighten the swingarm bolts down, but not all the way.
6. Spin the tire around while constantly stopping to check the chain slack. If it's even all the way around, tighten the swingarm bolts all the way. You're done! If not, go to Step 7.
7. If the chain slack runs uneven around the clock, re-check the alignment marks and re-adjust as needed.
8. Re-perform steps 3 thru 7 until the chain properly adjusts. Give up after four failures.
9. If unable to properly adjust, you might need to perform a "string alignment'. Google that, if necessary. It's too complex to put in here.
10. ALWAYS make sure your Rex's chain is kept clean, and sparingly use a high-quality chain wax every 500 miles or so.