where can get an oversize front sprocket for a ksr moto worx 125?

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777
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where can get an oversize front sprocket for a ksr moto worx 125?

Post by 777 » Thu Feb 13, 2020 2:59 pm

ive had a look on google, to no avail. it looks like you could go up quite a few teeth on the front. it has a rather strange spline fitting, which ive never come across before. any help would be appreciated.

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fastbob » Thu Feb 13, 2020 3:06 pm

If I still worked in a bike shop and I had a JT Sprocket book to hand I look at all the variables and work it out by a process of elimination .

777
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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by 777 » Thu Feb 13, 2020 3:18 pm

fastbob wrote:
Thu Feb 13, 2020 3:06 pm
If I still worked in a bike shop and I had a JT Sprocket book to hand I look at all the variables and work it out by a process of elimination .
theres an online catalouge

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by Mississippi Bullfrog » Thu Feb 13, 2020 3:26 pm

If you go up a few teeth you'll raise the gearing which may make a 125 less able to hold higher gears at speed. The usual trick on 125s is that they are over geared from the factory so you drop one tooth at the front. That lets the engine rev higher in higher gears so they can hold top gear better on open roads.
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777
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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by 777 » Thu Feb 13, 2020 3:28 pm

Mississippi Bullfrog wrote:
Thu Feb 13, 2020 3:26 pm
If you go up a few teeth you'll raise the gearing which may make a 125 less able to hold higher gears at speed. The usual trick on 125s is that they are over geared from the factory so you drop one tooth at the front. That lets the engine rev higher in higher gears so they can hold top gear better on open roads.
i know

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fastbob » Thu Feb 13, 2020 3:57 pm

777 wrote:
Thu Feb 13, 2020 3:18 pm
fastbob wrote:
Thu Feb 13, 2020 3:06 pm
If I still worked in a bike shop and I had a JT Sprocket book to hand I look at all the variables and work it out by a process of elimination .
theres an online catalouge
There is .

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fastbob » Thu Feb 13, 2020 4:00 pm

777 wrote:
Thu Feb 13, 2020 3:18 pm
fastbob wrote:
Thu Feb 13, 2020 3:06 pm
If I still worked in a bike shop and I had a JT Sprocket book to hand I look at all the variables and work it out by a process of elimination .
theres an online catalouge
Well off you go then , measure all the relevant features and dimensions and make a note of the chain pitch then start eliminating sprockets until you are left with the correct one .

777
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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by 777 » Thu Feb 13, 2020 4:01 pm

fastbob wrote:
Thu Feb 13, 2020 3:57 pm
777 wrote:
Thu Feb 13, 2020 3:18 pm
fastbob wrote:
Thu Feb 13, 2020 3:06 pm
If I still worked in a bike shop and I had a JT Sprocket book to hand I look at all the variables and work it out by a process of elimination .
theres an online catalouge
There is .
any chance you could take a look? i cant find it on there

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fastbob » Thu Feb 13, 2020 4:52 pm

777 wrote:
Thu Feb 13, 2020 4:01 pm
fastbob wrote:
Thu Feb 13, 2020 3:57 pm
777 wrote:
Thu Feb 13, 2020 3:18 pm

theres an online catalouge
There is .
any chance you could take a look? i cant find it on there
How can I find it if I don't know any of the dimensions ? How many teeth do you want ? You have to know the chain size , the internal hole size , the number of splines , any threaded holes , any raised bosses etc etc .

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fredc » Thu Feb 13, 2020 4:53 pm

on ebay - 13 tooth front sprocket

https://www.ebay.co.uk/itm/333114514905 ... gLm5fD_BwE



edit: includes a drawing with dimensions
Last edited by fredc on Thu Feb 13, 2020 6:16 pm, edited 1 time in total.

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fastbob » Thu Feb 13, 2020 5:51 pm

That's right , I have also come to that conclusion . But our friend wants to change the number of teeth . I think there might have been a misunderstanding that the BIKE would be listed on the JT site but that's unlikely because it one of dozens of obscure Chinese bikes. My method of sprocket finding used to be to draw a sketch of all the variables and dimensions and then go through the JT book until I found it and then look at teeth options . Now that we have the data we can go through the JT site to see whether it's available in other sizes . The distinguishing feature of this sprocket is the recessed area where the lock washer sits.
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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fastbob » Thu Feb 13, 2020 8:03 pm

Ok here it is . Have a good evening . https://www.esjot.com/en/motorcycle-spr ... le/572865/

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by fastbob » Thu Feb 13, 2020 8:10 pm

777 wrote:
Thu Feb 13, 2020 2:59 pm
ive had a look on google, to no avail. it looks like you could go up quite a few teeth on the front. it has a rather strange spline fitting, which ive never come across before. any help would be appreciated.
Here . https://www.esjot.com/en/motorcycle-spr ... le/572865/

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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by skyrider » Thu Feb 13, 2020 8:11 pm

what would people do on this forum without Bob he is one very handy guy to have around :thumb:
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Re: where can get an oversize front sprocket for a ksr moto worx 125?

Post by gogs01 » Thu Feb 13, 2020 10:30 pm

Can the OP let us know how he gets on with a front sprocket a few teeth over standard ? I'd be interested to find out whether his bike would be able to pull top gear on anything other than a downhill run.

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