530 Chain conversion

Now before anyone tells me to use the search function, I've searched this topic everywhere, including on this forum, what I haven't been able to find is, does anyone know if there is a 530 front sprocket that is a direct swap without having to use a spacer, I want a sprocket that is the correct width over the spline so I don't need any spacers. Sorry if its hidden here somewhere but I haven't been able to find it. I have a GPZ750R1 and I'm after a 17 tooth front and 42 tooth rear in 530 to suit...

Thanks

I don't know of any ready kit's. But if you look at JT sprockets home page you can find all kinds of front sprockets with z13 21.7 25 spline.
If you would like to go all the way to 520 (and why shouldn't you) a front sprocket from a ZXR400L (JTF512) would fit fine and you will have the possibility to flip the sprocket if you like to get out a mm. (That would require that you follow with the rear sprocket

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scubaanders wrote: I don't know of any ready kit's. But if you look at JT sprockets home page you can find all kinds of front sprockets with z13 21.7 25 spline.
If you would like to go all the way to 520 (and why shouldn't you) a front sprocket from a ZXR400L (JTF512) would fit fine and you will have the possibility to flip the sprocket if you like to get out a mm. (That would require that you follow with the rear sprocket

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Yes, I've had no trouble finding the sprockets in the sizes I want, just need to space them out, Now you have me interested in the 520, do you mean ZXR 400L sprockets front and back, or the 400 at the front matched to ? on the rear... Would they come in the 17/42 sizes..?
OK, after a look at JT's catalogue I see that both the 400L front and back are a match, and in the correct sizes, do I still need a backing spacer with these sprockets..?

I don't see why you should shims the sprocket out with a spacer. That is only needed if you like to fit a wider wheel. But then again just a washer would not do. You will need a offset front sprocket.
Obs! I am not sure if the zxr400 rear sprocket will fit the Gpz750r1 you will have to check the bolt pattern and center hole.
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scubaanders wrote: I don't see why you should shims the sprocket out with a spacer. That is only needed if you like to fit a wider wheel. But then again just a washer would not do. You will need a offset front sprocket.
Obs! I am not sure if the zxr400 rear sprocket will fit the Gpz750r1 you will have to check the bolt pattern and center hole.
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Looks like the rear sprocket is the same bolt pattern, so that good. I thought the GPZ front sprockets had a thicker center section that the smaller 530/520 sprockets didn't have, hence the spacer .? I read that on here, I haven't actually taken mine off yet ... I'll be fitting wider wheels further down the track but i'm not worried about that for now...

Here's both sprockets www.jtsprockets.com/catalogue/model/1107

Yes the 630 sprocket has a wider center section so if it don't cover the spline a washer is needed. But I would put that on the outside of the sprocket so that the nut don't get in contact with the spline, if needed.
Beacuse if you move the front sprockeet out, the rear has to follow just as much.
But you have to make sure the 520 17 front sprocket will fit inside the chain guard, inside your sprocket cover.
There are formulas on the net where you can compare 630 13 vs 520 17 diameters.
Fitting a wider rear is a totaly different ballpark. I am going for a 5' rear wheel on my build where the sprocket offset has to go from original 90 mm to 100mm by puting a 3/8 offset sprocket up front and milling down the cush drive on a zxr400 wheel by 8mm to get the chain to line up.
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Excellent info Anders. Is this the calculator..?

www.rbracing-rsr.com/calcsprocketdiam.html

If i'm correct it works out at about a 3.4mm increase in Radius {6.8mm diameter}, is there enough room for that..?

630 x 13 tooth = 3.133 inches or 79.58mm Diameter
520 x 17 = 3.401 inches or 86.38mm.... Diameter

What wheels are you using the ZXR cush drive with..? I'm looking at running a 18 x 2.75 front and a 4.5 x 18 rear eventually.....

It sounds about right and could work. You need to remove your chain cover and have a look.
The 520 rollers are slightly thinner so you gain some there, but you need to check.
Don't be tempted to remove the chain guard if it gets tight as it protects the clutch push rod. In that case go for a 16 tooth front sprocket. I can't recall if I went for 16 or 17, I think 16 as I am using a 530 chain with slightly thicker rollers.
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Ok, at least I have the measurements now, there may even be a little room to modify the chain guard, I'll have a look this week, my seal kit arrived today... Thanks heaps for your help, its much appreciated....

By the way, when you fit a 520 sprocket to the original Gpz750R1 cush drive, make sure the nuts can bottom out before the threads run out. Otherwise the sprocket will not fit as tight as it should to the cush drive. (can cause some unexpected results :blink: )
In that case you might have to take the studs out and thread them a little further.

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I used the following on my 750E. As far as I know the R1 uses the same gearing.

JTR488.40 Rear sprocket
JTF513.16 Front sprocket
These sprockets match the stock gear ratio.

530 chain with 102 links.

A 530 chain is the same width as a 630 so no spacers needed.

Stock gearing with the 630 setup is 33 rear and 13 front.

I'm fortunate enough to have a good independent motorcycle shop in town. I just walked in and asked for the parts I needed to convert to 530, one tooth up equivalent.

Within 20 min I was walking out the door with everything including a loaner chain breaker/crimper.