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530 conversion question (spacer)

  • Thread starter Thread starter quiktrp
  • Start date Start date
Q

quiktrp

Guest
I have a 79 GS750E, and just did the 530 conversion on. I did a 16 tooth front, and 50 tooth rear sprocket. If I install the 530 front sprocket with the 6mm spacer between the trans and the sprocket, the sprocket is way out, out far enough where the sprocket is only half on splines. If I install the sprocket without the spacer and check sprocket alignment with a straightedge, it is perfect. Obviously this is how I will leave it. My question I suppose is more of a curiosity thing. Why is my bike different than all the others that have done the conversion? Am I supposed to put the spacer between the nut and sprocket?
 
I haven't done this conversion yet, but the 6mm spacer figures to go outside the sprocket. The new 530 sprocket is thinner and needs the spacer to allow the nut to tighten down correctly.
 
KEITH KRAUSE said:
I haven't done this conversion yet, but the 6mm spacer figures to go outside the sprocket. The new 530 sprocket is thinner and needs the spacer to allow the nut to tighten down correctly.
Click to expand...

I wonder if I have some sort of aftermarket nut on mine then, it has a recess built into it to allow it to tighten down over the splines. Oh well, I bought the spacer, I might as well use it :)

Thanks for the quick reply keith :-D
 
Your bike is no different than anyone elses. The order of installation is sprocket, 6mm spacer, splined lockwasher, sprocket nut.

Although your sprocket nut has a recess in it to allow it to tighten down over the splined washer, the recess is not deep enough to allow it to tighten down properly to compensate for the reduction in thickness when converting from a 630 sprocket to a 530 sprocket. You must use the spacer. Do not ride the bike without the 6mm spacer installed in the correct order.

Earl


quiktrp said:
I have a 79 GS750E, and just did the 530 conversion on. I did a 16 tooth front, and 50 tooth rear sprocket. If I install the 530 front sprocket with the 6mm spacer between the trans and the sprocket, the sprocket is way out, out far enough where the sprocket is only half on splines. If I install the sprocket without the spacer and check sprocket alignment with a straightedge, it is perfect. Obviously this is how I will leave it. My question I suppose is more of a curiosity thing. Why is my bike different than all the others that have done the conversion? Am I supposed to put the spacer between the nut and sprocket?
Click to expand...
 
Last edited:
earlfor said:
Your bike is no different than anyone elses. The order of installation is sprocket, 6mm spacer, splined lockwasher, sprocket nut.

Although your sprocket nut has a recess in it to allow it to tighten down over the splined washer, the recess is not deep enough to allow it to tighten down properly to compensate for the reduction in thickness when converting from a 630 sprocket to a 530 sprocket. You must use the spacer. Do not ride the bike without the 6mm spacer installed in the correct order.

Earl
Click to expand...
Yep, as always Earl got it right.
Even at 2:06 in the morning:shock:
What a night owl\\:D/
 
crag antler said:
Yep, as always Earl got it right.
Even at 2:06 in the morning:shock:
What a night owl\\:D/
Click to expand...
Hey! :) I got it right too. And more than three hours before Earl too. :)
 
Your bike is no different than anyone elses. The order of installation is sprocket, 6mm spacer, splined lockwasher, sprocket nut.

Although your sprocket nut has a recess in it to allow it to tighten down over the splined washer, the recess is not deep enough to allow it to tighten down properly to compensate for the reduction in thickness when converting from a 630 sprocket to a 530 sprocket. You must use the spacer. Do not ride the bike without the 6mm spacer installed in the correct order.

Earl
Click to expand...

Not trying to be a pain in the ass, but if I install in that order there is no spline left for the lockwasher to spline onto. It's onto the threaded portion of the shaft by at least 1/8". This is correct? I have done some reading up, and it seems others have some sort of rubber spacers on the front sprocket. Mine did not have this. It was a steel sprocket, with no holes drilled in it, with a relatively long steel spacer between the trans and sprocket. I guess I just don't see how the lockwasher would be effective without splining onto the shaft.

The bike is out of commission for the next week or so, so if it is incorrect right now it is no big deal to fix.
 
ok, I just found a pic of a "regular" 630 sprocket. It has a raised boss built into the side of it, like a built in spacer I guess. Mine did not have this. It was flat on both sides, and only had 630 stamped into the rear of the sprocket. I held the two sprockets up to each other, and thickness variance is negligable. Really the only difference I could discern was that the new sprocket had the teeth closer together, and the diameter was smaller.

Does this all sound like standard conversion still? It sounds like I'll just have to mic it out and make sure I have enough crush on the sprocket.

Thanks for the input so far guys, keep it coming please :)
 
Just found this:
530 5/8 inch pitch, 3/8 inch wide
630 3/4 inch pitch, 3/8 inch wide

Does this mean that the sprocket teeth are the same thickness also? The only difference in thickness between the sprockets being the built in spacers?
 
Well, as I said before, I haven't done this conversion so it's all Greek to me though it shouldn't be too hard to figure out.
I know there are a few threads here about the conversion that have a lot of info if you do a search.
My understanding of this whole fit situation is the new 530 sprocket is thinner than the 630 sprocket. How much thinner, I don't know exactly but you would obviously want a certain thickness spacer that, when combined with the new sprocket, equals the same thickness as a standard 630 sprocket. Then everything should line up and the splined lockwasher should fit correctly and do its job. I've heard about the 6mm spacers and I assume they're correct for these conversions. Never heard of any other thickness being used.
Sounds like you have some aftermarket sprocket but I don't know why you're having this problem. I also wonder if that "long" spacer between the sprocket and motor you mention is a stock part or it's creating this problem.
Could you show a good pic of the set up? Maybe we can figure it out easier? You sure don't want to make an installation mistake and lose a sprocket and chain while riding.
 
Last edited:
So?

So?

KEITH KRAUSE said:
Hey! :) I got it right too. And more than three hours before Earl too. :)
Click to expand...


Well, Keith, you ought to know by now, that doesn't count!:-D :-D
 
Maybe once you remove the 630 sprocket, you also remove the oem spacer and replace it with the new one, then install the 530 sprocket and hardware ???

I'd double check with the company you it bought from just to make sure.

How about Hines on his Harley 8O
 
Your bike is different. :) You don't need the spacer. It is not used on the 1977-79 GS750's.

It is required on the 1980-83 GS750's, but not your bike.

That explains why the spacer doesn't appear to fit your bike. It is not the correct part for your bike.

My information comes from the Sun and JT sprocket catalogs.
 
Last edited:
Boondocks said:
Your bike is different. :) You don't need the spacer. It is not used on the 1977-79 GS750's.

It is required on the 1980-83 GS750's, but not your bike.

That explains why the spacer doesn't appear to fit your bike. It is not the correct part for your bike.

My information comes from the Sun and JT sprocket catalogs.
Click to expand...
:-D:-D

I knew I wasn't crazy! Thanks for all the help guys, hopefully the next goofball doing the swap with this bike will see this thread and save himself some trouble. I would have saved the questions and just measured, but the bike is in pieces at my parents house 20 miles away and it's a pain in the butt to go there for every little thing. So I bug you guys \\:D/
 
Some sprockets are just a flat sprocket. Some are made with a "boss" on one side, which is nothing more than an integral spacer. In chain/sprocket sizes, dimensions are referenced in 1/8" increments. The first number is pitch. the 2nd number is thickness. i.e. 630 chain has a pitch of 6/8" and a thickness of 3/8". 530 chain has a pitch of 5/8" and a thickness of 3/8". If you use a simple flate plate sprocket in either 630 or 530 size, you will need a spacer.
If using a "bossed" sprocket, no spacer if required.

In reference to the comment about not having the "rubber" spacer, that is not quite accurate. On the original manufacture sprockets, there was a rubber inset which acted as a silencer to quiet chain noise. This rubber was sandwiched between a spacer and the sprocket and the countershaft mated to the steel side of the sprocket as normal. The rubber was only a doughnut, not a spacer for the sprocket.

Earl


quiktrp said:
Just found this:
530 5/8 inch pitch, 3/8 inch wide
630 3/4 inch pitch, 3/8 inch wide

Does this mean that the sprocket teeth are the same thickness also? The only difference in thickness between the sprockets being the built in spacers?
Click to expand...
 
earlfor said:
...If you use a simple flate plate sprocket in either 630 or 530 size, you will need a spacer....
Click to expand...

This is incorrect information for a 1987-89 GS750 as I pointed out in my earlier post.

quiktrp said:
ok, I just found a pic of a "regular" 630 sprocket. It has a raised boss built into the side of it, like a built in spacer I guess. Mine did not have this. It was flat on both sides, and only had 630 stamped into the rear of the sprocket. I held the two sprockets up to each other, and thickness variance is negligable. Really the only difference I could discern was that the new sprocket had the teeth closer together, and the diameter was smaller....
Click to expand...

As quiktrp indicated in his earlier post, the original 630 sprocket did not have a raised boss. The original sprocket was flat and did not have a spacer. He bought a 6mm spacer that he does not need.

He has already stated that the sprocket fits and lines up correctly without the spacer. As I mentioned in my earlier post, the 630 to 530 conversion information in the Sun and JT sprocket catalogs indicate that the GS750's use the same countershaft sprockets, but only the 1980-1983 models require the 6mm spacer. quiktrp's 1979 GS750E does not require the spacer on a flat (no boss) sprocket.

What part of this explanation and actual satisfactory fitting by quiktrp without a spacer is under dispute?
 
RacingJake said:
Won the event this past week and took the lead in the points. With a little luck he might just get back in the high 6's again.
Click to expand...

Oh, I was thinking it would be a horror story related to loss of body parts due to a loose front sprocket 8-[
 
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