Question about 2005 Yamaha Ybr 125

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I need to tighten my chain

Chain is really slack,need to tighten but am inexperienced at bike maintenance

Posted by grant_darlow on


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Look at the rear axle. There should be marks on both sides indicating where the axle is in relation to the swingarm. Note the position of the axle, then loosen the axle. There MAY be chain adjusters at the back end of the swingarm, but not all bikes have those. If yours does, as you look at the swingarm from the rear of the bike you will see two adjustment bolts. Tighten those up, and make sure you keep the axle position indicators the same on both sides. Your chain should have 1-2 inches of slack as you lift and press down on the middle of the longest run of the chain. Often there is a sticker on the swingarm that tells you how much slack is acceptable, do as the sticker says if it is there.

Posted on Mar 15, 2009



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Take the factory tool kit supplied with the bike ( it will be under the seat or under a plastic side cover near the battery ), and take out the wrench that fits the rear axle nut. Loosen the nut then use the 10mm wrench to adjust the chain. You will see about 6 marks on the metal frame just above the axle on both sides of the wheel. These are reference marks that the single mark on the adjuster can line up with. Adjust the chain evenly on both sides relative to the reference marks. Leave the chain a bit of slack as opposed to super tight. Now tighten the axle nut good and tight. Next, tighten each adjuster just a bit even though the axle is tight and the wheel will no longer move. This will put pressure on the adjusting nut and prevent having the nut come loose.

Posted on Mar 15, 2009


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Need to tighten drive chain on a honda ca 125 but bike only has a side stand; does the rear wheel need to be in the air in order to adjust using the adjusting nuts?

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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.

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Hi my name is Scott & I need to know.How do i tighten the chain on my bike.I Know I got to loosen the axle bolt,I need to know what to do with the chain tension bolts please HELP...

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 Scott. I hope this helps you. Love them dirt bikes.

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I need to tighten my chain on my fzr 1000,its a 1987

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.

Feb 14, 2011 | 1987 Yamaha FZR 1000

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It's my first time riding a bike . So don't really know the maintenance side.the chain has become loose but don't know how to adjust it. How do you tighten the chain ?

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

Aug 19, 2010 | 2007 Yamaha Ybr 125

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Chane slack

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.

Mar 04, 2010 | 2000 Honda VFR 800

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How do you tighten the chain on a zxr 1100 c3 pls ?

  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.

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