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Chain replacement
Posted: Thu Dec 17, 2015 8:37 am
by Nerdy Norm
I've just split my casings to renew the clutch plates, and I've noticed that the chain is very slack, and the tensioner is at the end of its adjustment.
So I guess it's time to bite the bullet and fit a new chain. I've never done it before, so what's the best way to go about it? I realise that one of the sprockets needs to be removed, but which one's the easiest to remove/refit (bearing in mind I've already removed the clutch plates)?
Thanks!
Re: Chain replacement
Posted: Thu Dec 17, 2015 8:48 am
by DigDug
Just fit a pull down tensioner.
Re: Chain replacement
Posted: Thu Dec 17, 2015 9:24 am
by Nerdy Norm
Thanks, but isn't that a bit of a bodge? Since I've got the casing open, I might as well replace what is a clearly worn chain - it might even still be the original for all I know. I definitely wouldn't want it snapping on me and locking the wheel, never mind the hassle of splitting the engine again.
Re: Chain replacement
Posted: Thu Dec 17, 2015 10:34 am
by Ilango
Nerdy Norm wrote:I've just split my casings to renew the clutch plates, and I've noticed that the chain is very slack, and the tensioner is at the end of its adjustment.
So I guess it's time to bite the bullet and fit a new chain. I've never done it before, so what's the best way to go about it? I realise that one of the sprockets needs to be removed, but which one's the easiest to remove/refit (bearing in mind I've already removed the clutch plates)?
Thanks!
Remove the driven (clutch bell) sprocket to change the chain. It is easier than locking the crank and undoing the drive sprocket bolt.
Re: Chain replacement
Posted: Thu Dec 17, 2015 11:10 am
by DigDug
Nerdy Norm wrote:Thanks, but isn't that a bit of a bodge? Since I've got the casing open, I might as well replace what is a clearly worn chain - it might even still be the original for all I know. I definitely wouldn't want it snapping on me and locking the wheel, never mind the hassle of splitting the engine again.
Nope -- with some sprocket combinations you had to use a "stretched chain" before the advent of the pull-downs.
Re: Chain replacement
Posted: Thu Dec 17, 2015 11:27 am
by Nerdy Norm
Thanks fellas.
I know about the "stretched chain" thing, but I would have thought that it wasn't an ideal situation, and that a new, non-stretched chain should be more reliable - is that not correct?
Re: Chain replacement
Posted: Thu Dec 17, 2015 11:40 am
by HxPaul
Ilango wrote:Nerdy Norm wrote:I've just split my casings to renew the clutch plates, and I've noticed that the chain is very slack, and the tensioner is at the end of its adjustment.
So I guess it's time to bite the bullet and fit a new chain. I've never done it before, so what's the best way to go about it? I realise that one of the sprockets needs to be removed, but which one's the easiest to remove/refit (bearing in mind I've already removed the clutch plates)?
Thanks!
Remove the driven (clutch bell) sprocket to change the chain. It is easier than locking the crank and undoing the drive sprocket bolt.
+1.Remove and replace with an Iwis chain.This way you can still use your standard type push up tensioner.I use Iwis chains in both of my scooters and neither have stretched in use over thousands of miles.With what you save on getting a decent pull down tensioner you can get a new chain.
Re: Chain replacement
Posted: Thu Dec 17, 2015 11:41 am
by shocky
Nerdy Norm wrote:Thanks fellas.
I know about the "stretched chain" thing, but I would have thought that it wasn't an ideal situation, and that a new, non-stretched chain should be more reliable - is that not correct?
yes if its of comparable or better quality scootopia do a nice italian chains for £14 not sure they have 80, s any more but worth asking also justlambretta sell them and the owners a member on here

(other dealers are available)
Re: Chain replacement
Posted: Thu Dec 17, 2015 11:53 am
by Nerdy Norm
I've ordered an Iwis 80 link chain, fingers crossed it's the right one

Re: Chain replacement
Posted: Thu Dec 17, 2015 12:04 pm
by Donnie
you did count the links on the old one didn't you?