GZ125 chain replacement

EzyRider · 12-22-2011, 05:50 AM

Right then, been reading a lot of the topics on here for a while, now it's time to try and get the answers to my questions...

I have a Suzuki GZ125 (58 Plate, the K8 I believe) and I think the chain/sprockets need replacing... First, I take it they have to be done as a set?

Second. I believe it is as the 250 and a 15T front as standard? I have read the guide on fitting a 16T front sprocket, would a 125 cope with this? or would it just kill it with it's limeted power?
Looking to get the revs down a bit at the 'higher' speeds...(Though I can only get 70 out of it!)

Will the 250 workshop manual be the same as the 125? I cannot find a workshop manual for the 125 of this age anywhere!

Can anyone point me in the direction of or tell me the detials of the chain and sprockets required for the 125?

How much of an in depth job is a chain replacement? I used to be a mechanic, but never touched bikes...

Sorry for the list of questions! Any advice you can offer is much appreciated!!

Cheers all!

JWR · 12-22-2011, 08:16 AM

The GZ125 never came to North America.

I believe the bodies are the same.
You have to cut the chain to remove it.
You will have to use a master link to put the new chain on.
The sprockets are easy to remove and change out.
There should not be lot of difference in prices from a dealer or parts warehouse .
The 250 really does not pull the 16 tooth sprocket well.
The workshop manual will give you all the information that you will need.

http://www.motonet.biz/eshop/front-sprockets-jt/

EzyRider · 12-22-2011, 08:41 AM

Quote:

Originally Posted by JWR

The 250 really does not pull the 16 tooth sprocket well.

So I'm guessing then that if the 250 doesn't like the 16T the 125 will be even worse...
Do you know the weight and BHP of the 250 off the top of your head?

Cheers for the link, will have a look on there.

What chain type would you recomend?

Jvacustoms · 12-22-2011, 09:29 AM

Quote:

Originally Posted by EzyRider

Quote:

Originally Posted by JWR

The 250 really does not pull the 16 tooth sprocket well.

So I'm guessing then that if the 250 doesn't like the 16T the 125 will be even worse...

I would say that if it is performance/speed outta the bike that you are looking for, Dont use the 16t.

If you are rather, trying to make the bike's tasking easier for it to manage at normal speeds and average use, then use the 16t.

I personally like the acceleration of the 250 with out the 16t it is quite... "Peppy" and with the 16t it just lost its "peppyness" and became rather boring. So i changed it back after 3 weeks and it has sat on my workbench since.

EzyRider · 12-22-2011, 09:48 AM

I'm not so worried about the speed, the majority of what I do is city commuting miles so around 30 - 50 mph I'm rarely on a road that allows 60, let alone 70 (and being on a 70mph road on a 125 is a scary experiance...)

So really I'm looking to drop the revs slightly when doing say 50 - 60 as that's when it starts to scream...
So would you say there is much loss in acceleration upto the 50-60 mark?

Gz Rider · 12-22-2011, 10:09 AM

...

EzyRider · 12-22-2011, 10:41 AM

Interesting...

Might need to look into this a bit thurther before making any changes from the factory standard.
What is the easiest way to work this out? Find out the number of teeth, then work out the ratios from teeth numbers, then what next?

Gz Rider · 12-22-2011, 10:47 AM

...

EzyRider · 12-22-2011, 11:11 AM

Unfortunately 125 owners seem pretty hard to come by full stop... Might be simpler to leave it as it is I think.
The chain needs changing either way so will do that and maybe have a hunt around and bide my time before doing anything rash!

alantf · 12-22-2011, 11:59 AM

Hi there, & welcome to the madhouse. I see that you're from Great Britain. Whereabouts exactly, because that description fits England, Scotland, Wales & Northern Ireland. Are you a Paddy, Jock, Taffy or an Englishman. :whistle: :roll:

BTW, you asked if you needed to change the front sprocket at the same time as the chain. Check the sprocket for wear. If it's not worn, then there's no need to replace it. The same goes for the chain. Check it, & make sure what condition it's in. It's more than likely that all that's required is a good clean & lube (plus setting to the correct tension). :2tup:

There are quite a few GZ125s, here on the island. Most of our speed limits are 50kmh (30MPH) so they're quite adequate for the job. Don't know anyone, personally, who's got one, so I don't know about parts being the same as the 250.

12-22-2011, 05:50 AM	#1
EzyRider Junior Member Join Date: Dec 2011 Location: Great Britain Posts: 7	GZ125 chain replacement Right then, been reading a lot of the topics on here for a while, now it's time to try and get the answers to my questions... I have a Suzuki GZ125 (58 Plate, the K8 I believe) and I think the chain/sprockets need replacing... First, I take it they have to be done as a set? Second. I believe it is as the 250 and a 15T front as standard? I have read the guide on fitting a 16T front sprocket, would a 125 cope with this? or would it just kill it with it's limeted power? Looking to get the revs down a bit at the 'higher' speeds...(Though I can only get 70 out of it!) Will the 250 workshop manual be the same as the 125? I cannot find a workshop manual for the 125 of this age anywhere! Can anyone point me in the direction of or tell me the detials of the chain and sprockets required for the 125? How much of an in depth job is a chain replacement? I used to be a mechanic, but never touched bikes... Sorry for the list of questions! Any advice you can offer is much appreciated!! Cheers all! Login or Register to Remove Ads
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12-22-2011, 08:16 AM	#2
JWR Senior Member Join Date: Jan 2009 Location: Louisville, TN Posts: 1,413	Re: GZ125 chain replacement The GZ125 never came to North America. I believe the bodies are the same. You have to cut the chain to remove it. You will have to use a master link to put the new chain on. The sprockets are easy to remove and change out. There should not be lot of difference in prices from a dealer or parts warehouse . The 250 really does not pull the 16 tooth sprocket well. The workshop manual will give you all the information that you will need. http://www.motonet.biz/eshop/front-sprockets-jt/ __________________ Jerry Truth is there are lots of great bikes available and not nearly as many good riders out there riding them... "A man's got to know his limitations..."
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12-22-2011, 09:48 AM	#5
EzyRider Junior Member Join Date: Dec 2011 Location: Great Britain Posts: 7	Re: GZ125 chain replacement I'm not so worried about the speed, the majority of what I do is city commuting miles so around 30 - 50 mph I'm rarely on a road that allows 60, let alone 70 (and being on a 70mph road on a 125 is a scary experiance...) So really I'm looking to drop the revs slightly when doing say 50 - 60 as that's when it starts to scream... So would you say there is much loss in acceleration upto the 50-60 mark? Login or Register to Remove Ads
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12-22-2011, 10:09 AM	#6
Gz Rider Senior Member Join Date: Aug 2011 Posts: 852	Re: GZ125 chain replacement ... __________________ *Alert - This person is a douche. Use these comments and advice at your own risk*
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12-22-2011, 10:41 AM	#7
EzyRider Junior Member Join Date: Dec 2011 Location: Great Britain Posts: 7	Re: GZ125 chain replacement Interesting... Might need to look into this a bit thurther before making any changes from the factory standard. What is the easiest way to work this out? Find out the number of teeth, then work out the ratios from teeth numbers, then what next?
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12-22-2011, 10:47 AM	#8
Gz Rider Senior Member Join Date: Aug 2011 Posts: 852	Re: GZ125 chain replacement ... __________________ *Alert - This person is a douche. Use these comments and advice at your own risk*
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12-22-2011, 11:11 AM	#9
EzyRider Junior Member Join Date: Dec 2011 Location: Great Britain Posts: 7	Re: GZ125 chain replacement Unfortunately 125 owners seem pretty hard to come by full stop... Might be simpler to leave it as it is I think. The chain needs changing either way so will do that and maybe have a hunt around and bide my time before doing anything rash!
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12-22-2011, 11:59 AM	#10
alantf Senior Member Join Date: Nov 2008 Location: Tenerife (Spain) Posts: 3,719	Re: GZ125 chain replacement Hi there, & welcome to the madhouse. I see that you're from Great Britain. Whereabouts exactly, because that description fits England, Scotland, Wales & Northern Ireland. Are you a Paddy, Jock, Taffy or an Englishman. :whistle: :roll: BTW, you asked if you needed to change the front sprocket at the same time as the chain. Check the sprocket for wear. If it's not worn, then there's no need to replace it. The same goes for the chain. Check it, & make sure what condition it's in. It's more than likely that all that's required is a good clean & lube (plus setting to the correct tension). :2tup: There are quite a few GZ125s, here on the island. Most of our speed limits are 50kmh (30MPH) so they're quite adequate for the job. Don't know anyone, personally, who's got one, so I don't know about parts being the same as the 250. __________________ By birth an Englishman, by the grace of God a Yorkshireman.
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