Sunstar sprocket

[chef1366]

I bought a Sunstar front sprocket off fleabay. My stock sprocket has a Spacer? Cover? that has a three phillip head screw pattern. The new sprocket has only one hole near the center spline hole. Did I get the wrong sprocket or can I just slip it on and bolt it down and forget about it?

[Tom MLC]

I bought a Sunstar front sprocket off fleabay. My stock sprocket has a Spacer? Cover? that has a three phillip head screw pattern. The new sprocket has only one hole near the center spline hole. Did I get the wrong sprocket or can I just slip it on and bolt it down and forget about it?

Are you doing a chain conversion? The newer sprocket should do just fine, but you may need a spacer BEHIND the sprocket to keep the sprockets aligned.

I shoulda taken pictures before I put mine on. Here's my front sprocket installed. You can't see it, but there's a 6mm spacer behind it.

[chef1366]

Tom,
I was gonna pm you cause I saw that pic on another thread. Did the spacer come with the sprocket or did you buy it or was the sprocket already switched out? Did your old sprocket look like mine?
No chain conversion.

[Tom MLC]

Tom,
I was gonna pm you cause I saw that pic on another thread. Did the spacer come with the sprocket or did you buy it or was the sprocket already switched out? Did your old sprocket look like mine?
No chain conversion.

My old sprocket looked just like yours. I threw it in the scrap metal pile at work. I might see if I can dig it out and take some pictures. Gotta start carrying my digital camera with me all the time. Dang, I shoulda took some pics before I put the sprocket on. I'm almost tempted to pop it back off.

When I did the 530 chain conversion on the GS1000, I called the folks at Z1 Enterprises. www.z1enterprises.com. They sold me JT sprockets, the spacer, and the chain. The spacer is necessary because the new sprocket is thinner than OEM. 6mm is about 1/4 inch. You could probably do as well with a few fat washers from Home Depot.

[Boondocks]

I bought a Sunstar front sprocket off fleabay. My stock sprocket has a Spacer? Cover? that has a three phillip head screw pattern. The new sprocket has only one hole near the center spline hole. Did I get the wrong sprocket or can I just slip it on and bolt it down and forget about it?

According to the Tucker Rocky catalog on page 616 a Sunstar replacement 630 front sprocket for your bike requires no spacer. A 6mm spacer is required (on the inside) only when doing a 530 chain conversion to insure the correct alignment.

A 15T 630 Sunstar front sprocket is Tucker Rocky part no. 90-6515.

[KEITH KRAUSE]

I haven't gone to the conversion yet on my 1000, and so I haven't really paid much attention to the alignment necessary/spacer needed.
I don't see why the spacer goes behind the sprocket. I can see it going in front of the sprocket, but not behind. Both new, thinner 530 sprockets would still line up when mounted as stock with the only difference being the thinner sprockets would not reach outward as far as the 630's. Of course, the spacer outside would be necessary to allow the holding nut to torque down everything, but the new/thinner sprockets would be in line already.
Putting the spacer on the inside would push out the 530 sprocket and it seems to me the alignment would be off.

[Boondocks]

I haven't gone to the conversion yet on my 1000, and so I haven't really paid much attention to the alignment necessary/spacer needed.
I don't see why the spacer goes behind the sprocket. I can see it going in front of the sprocket, but not behind. Both new, thinner 530 sprockets would still line up when mounted as stock with the only difference being the thinner sprockets would not reach outward as far as the 630's. Of course, the spacer outside would be necessary to allow the holding nut to torque down everything, but the new/thinner sprockets would be in line already.
Putting the spacer on the inside would push out the 530 sprocket and it seems to me the alignment would be off.

The stock 630 sprocket has a raised area on the inside. The 530 sprocket is flat, and the spacer is required to adjust the sprocket so that the chain clears the engine case and lines up properly. The explanation and diagrams at Z1 Enterprises - Converting from 630 to 530 chain cover this very well.

If a spacer is placed on the outside of a sprocket it doesn't change the alignment or "space" anything. It just becomes a washer.

[Tarbash 27]

I put a 530 on my bike, the sprockets were just as thick as my 630's. I didnt change any spacers or anything. My 530 chain is fatter than my 630 was.

[chef1366]

Thanks everyone!

[rphillips]

I don't think those spacers (covers) on the stock sprocket are spacers or covers. If you take them off the stock sprocket, then install it, the sprocket will still be aligned as it was with them on there. Seems like I remember these plates were chain noise dampeners, of some sort. I don't remember seing them on aftermarket sprockets, only on OEM.

[KEITH KRAUSE]

The stock 630 sprocket has a raised area on the inside. The 530 sprocket is flat, and the spacer is required to adjust the sprocket so that the chain clears the engine case and lines up properly. The explanation and diagrams at Z1 Enterprises - Converting from 630 to 530 chain cover this very well.

If a spacer is placed on the outside of a sprocket it doesn't change the alignment or "space" anything. It just becomes a washer.

Right. I was forgetting that the replacement sprocket doesn't have the noise reduction/dampening plates on it that the factory sprocket has. So you would obviously need the spacer as you said.
I shouldn't try to think at 12:16 in the morning.

[KEITH KRAUSE]

Tom, did you end up with 17/48 replacements or ? When I do the conversion, I think that's a good choice. If so, is a rear 530/48 the approx' same diameter as the stock 630/42? Any clearance/other issues you noticed after the change?

[Tom MLC]

Tom, did you end up with 17/48 replacements or ? When I do the conversion, I think that's a good choice. If so, is a rear 530/48 the approx' same diameter as the stock 630/42? Any clearance/other issues you noticed after the change?

Yeah Keith, with the 530 chain go 1 up on the front and 2 up on the rear keeps the same gear ratio. If you want to go exotic, now's the time to do it. But I wanted to keep the stock gear ratio.

Clearance was no problem. You had me going there for a minute wondering if I put the spacer on the wrong side.#-o (yeah, I was up at 12:30 am, too). Then I remembered reading the instructions that Boondocks posted. Without the spacer BEHIND the sprocket, the chain will rub against the tranny casing.

The guys at Z1 really talked me through all the options regarding sprocket and chain choices. You can get a choice of chain colors, too. I almost got a gold chain, but it was $30 bucks more.

I did one other interesting modification. I replaced the square head bolts inside the sprocket hub with square nuts. Then installed SS allen head metric bolts & lock washers from the outside. Got the hardware from McMaster Carr. I pre-drilled the bolt heads, and used lock wire to secure them. Looks sharp. Can't come loose. I'll probably post some pics in the appearance section.

Sorry for hijacking the thread, Bill.

[Tom MLC]

I bought a Sunstar front sprocket off fleabay. My stock sprocket has a Spacer? Cover? that has a three phillip head screw pattern. The new sprocket has only one hole near the center spline hole. Did I get the wrong sprocket or can I just slip it on and bolt it down and forget about it?

By the way. I notice in the original post. There is no lock washer in the diagram. Does your model not have a lock washer? Mine does. It's splined to keep it from rotating on the shaft. Then after torquing the nut, the washer needs to be bent along the flat of the nut. Should be done in several places.

Item 43 in this diagram


Look closely. You can see the washer is bent over the flat in two places.

[chef1366]

It has a lock nut.
Suzuki put insulation in the sprocket cover and noise dampeners on the sprocket. Interesting.