Chain Adjustment

Jonathan A · Crazy Courier Joined: 23 Jun 2012 Karma :

Hello!

The chain on my 125 has worked itself loose to the point of a jerky throttle and a horrid vibration. Me being the wimp I am I would usually go to my dealer to have it adjusted, but I am away from home at the moment Confused

Is it wise to bite the bullet and sort it out my self, and if so, what tips do you all have?

cheers

jon

the_quick · Nitrous Nuisance Joined: 03 Mar 2012 Karma :

it is quite easy.

Just remember to turn both adjusting bolt by same amount of turns, and don't forget to tight wheel nut when you finished.

Easy job.
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Cuchulain · Nitrous Nuisance Joined: 14 May 2011 Karma :

Jonathan A · Crazy Courier Joined: 23 Jun 2012 Karma :

Looked a bit at youtube and I think I have it sussed. Just one question, how tight should the axle nut be?

I looked at the manual,but its barely in English and it doesn't go into detail about the chain Mad

cheers

dungbug · Could Be A Chat Bot Joined: 05 Feb 2012 Karma :

What bike is it?
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Jonathan A · Crazy Courier Joined: 23 Jun 2012 Karma :

Its a CPI Sprint Very Happy

blito · Scooby Slapper Joined: 18 Apr 2011 Karma :

1) Measure the amount of slack on the chain - it should be between 1-2 inches of slack in the centre of the lower run of the chain. If the total amount of play is more than 2 inches then read on.
2) Loosen rear wheel retaining nuts (but not taking them off - you just want them to relinquish their grip)
3) There may be locking nuts on the adjusters to slacken.
4) Wind in the tension nuts - this effectively pulls the rear wheel backwards adding tension to the chain. Make sure you adjust both nuts evenly.
5) Measure the slack on the chain and also that the the wheel is straight.
6) Tighten the locknuts
7) Tighten the wheel nuts
8) Double check your measurements!

Takes about 5 minutes. Maybe worthwhile giving it a shot of chain lube at the same time as this will help slow down the wear rates of the chain and sprockets.
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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Alpha-9 · Super Spammer Joined: 19 Jan 2012 Karma :

pinkyfloyd · Super Spammer Joined: 20 Jul 2010 Karma :

No need to elaborate on whats been said but a good tip is to use a sharpie marker to draw a little line vertically on the end of your tension nuts. That way you can keep an eye on their position so you know you have done them both the same.

https://img.photobucket.com/albums/v494/be1ly/IMG_2436Medium.jpg

Like so. You know then if the black marks are in the same position on both sides your wheels straight.
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Jonathan A · Crazy Courier Joined: 23 Jun 2012 Karma :

Cheers for all your help Smile

I will give it a shot later on

map · Mr Calendar Joined: 14 Jun 2004 Karma :

Sort of on topic has anyone any step by step advice of adjusting chain tension with only a side stand?

This is for my lad who's currently stuck at his gf with a too slack chain. So, no sympathy from me then, numpty should indulge in some regular checks and maintenance (bike and gf, boom boom*).

I'm not too happy with his suggestion of strapping a paddock stand to my bike and taking it round for him (it's about 15 miles!). Going up after work anyhow to see if he's sorted it.

If it was me I'd just adjust it with the tension/adjusters on the side stand. At a push lever it on the side stand and front wheel and put an axle stand to raise the back wheel (forming a narrow triangle of 3 points of support). Anything I'm missing?

Thanks.

* as Basil would say
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crackfinder · Crazy Courier Joined: 05 Jul 2009 Karma :

Kwakki Si · Trackday Trickster Joined: 08 Jan 2012 Karma :

Easy peesy my friend, just look on the tube. Wheel locking nut nice and snug.
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Andy_Pagin · World Chat Champion Joined: 08 Nov 2010 Karma :

If you've got a drum brake there will be a tie rod holding the middle part in place, you'll need to unbolt it along with the brake adjuster rod before you adjust the slack.
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