1982 GS750E 530 Chain Conversion

[Guest]

Planning to do the 530 chain conversion but would like a bit lower RPM at highway speeds (less buzzy). Thinking of going with 16T front sprocket (stock is 41R/15F). Suggestions (stick with stock or go up 1 or 2 teeth?) are welcomed.

Looking at this kit, I can specify larger sprocket if desired:

https://www.motosport.com/sunstar-5...mmy=suzuki;gs750e;1982&mmy_source=pdp&variant[SUT0001]=SUT0001-X001-Y219

 

[Nessism]

When doing a 530 conversion you need to be mindful of the front sprocket diameter. A 15T front in 630 is roughly equal to an 18T in 530. If you have clearance you can try a 19T front, what will lower rpm's on the freeway a noticeable amount.

41/15 = 2.73 ratio

18 x 2.73 = 49T rear sprocket (for the stock ratio)

You will also need a longer chain. 630 = 6/8 between links. 530 = 5/8. It's simple math to figure out chain length against the stock chain. Just be sure to round up to the nearest even number.

 

[Guest]

Thanks Nessism!

I was curious, knowing that the 530 links are shorter I expected the sprockets to be smaller as well. It is interesting that the web site I linked above shows the new 530 sprockets (for 1982 GS750E) to be 41/15 with a 96 link chain, same numbers as the stock 630 setup.

 

[trevor]

Won't he need a spacer as well for the front sprocket?

 

[Guest]

Won't he need a spacer as well for the front sprocket?

I do not believe so on the GS750...

 

[trevor]

I do not believe so on the GS750...

It was almost ten years ago that I did my 80 gs750e but pretty sure it needed one....

 

[Guest]

Hmmm, the plot thickens! I did use the Search function here and saw posts about the spacer being needed on 1000s and/or 1100s due to the fact that the OEM front sprocket was wider at the base (along the spindle) than the replacement sprockets. The width at the teeth is the same as the links are the same width. The spacer was needed because the nut that holds the sprocket on would not bottom out due to the reduced width at the shaft so the sprocket was "loose".

Look forward to responses from others who have experience with the 750.

BTW, I called Motosport and ended up ordering 16/42 to replace my 15/41. The chains all come in 120 link lengths so no issue there (calculations show I will need 116 links instead of the 96 from the 630 chain).

 

[steve murdoch]

I always thought the 6mm spacer was required behind the front sprocket on all the 750/1000/1100 conversions.
Check with Z1Enterprises, they used to offer a complete kit.
https://www.z1enterprises.com/

 

[Rich82GS750TZ]

Just did mine recently and needed the spacer. IIRC, my research indicated that, of the 80's 16v 750s, the T and E need the spacer on the outside, the L did not (something of a different sprocket design of L). Z1 had the recommendation when I went on the site to order my sprockets.

Here's the thread on my conversion w/ some good advice and links to what I bought, but I kept the standard ratio.

 

[trevor]

Omg...I am just thrilled that I have been useful in a mechanical thread! :adoration:

 

[Guest]

Omg...I am just thrilled that I have been useful in a mechanical thread! :adoration:

Winning!!!

 

[Guest]

Just did mine recently and needed the spacer. IIRC, my research indicated that, of the 80's 16v 750s, the T and E need the spacer on the outside, the L did not (something of a different sprocket design of L). Z1 had the recommendation when I went on the site to order my sprockets.

Here's the thread on my conversion w/ some good advice and links to what I bought, but I kept the standard ratio.

Thanks Rich! I wish my search had led me to your thread, very helpful! I just ordered a 6mm spacer from Z1 just in case.

 

[salty_monk]

The spacer goes on the outside of the front sprocket, directly under the nut. This is because the sprockets are thinner so it?s the ?outside? that changes position relative to the 630 as the inside ?stop? or point the sprocket touches is still the same both front and back.

 

[Guest]

The spacer goes on the outside of the front sprocket, directly under the nut. This is because the sprockets are thinner so it’s the “outside” that changes position relative to the 630 as the inside “stop” or point the sprocket touches is still the same both front and back.

Got it... thanks!!

 

[wyly]

I don't know if this is helpful as I have an 1150efe.

I thought the the lower cases are the same size but I could be wrong, I required a spacer for my conversion. The chain then made contact with the peg hanger, I removed two washers on the hanger to gain clearance and reversed the rear sprocket so that the dish shape faced inwards to gain another 2mm. I suspect part of contact the problem was because the 630 rear sprocket was considerably larger than the 530 and the chain hung lower than with the smaller 45t sprocket.

I used an 18t on the front (17 works as well) and a went with a 45t on the rear, a nice improvement in fuel range. No significant acceleration loss as I've previously increased hp/torque and trimmed 45lbs in weight.

Saved another 3lbs in weight reduction for the 530 vs the old 630 setup.

It's helpful to use a laser for the initial setup to confirm it all lines up.

 

[salty_monk]

When converting to 530 you use sprockets with more teeth than 630 to maintain the physical sprocket diameter. You can still have approx the same ratio.

 

[Guest]

I just realized that I do not have the right size of socket for the nut on the drive sprocket. It is difficult to get a caliper in there to measure, does anyone know the correct socket size? Looks to be 32mm or 34mm??

 

[Nessism]

I just realized that I do not have the right size of socket for the nut on the drive sprocket. It is difficult to get a caliper in there to measure, does anyone know the correct socket size? Looks to be 32mm or 34mm??

Sorry, I don't know. But be sure to check your SAE size sockets too. Sometimes you get lucky.

 

[cowboyup3371]

I believe yours is the same as mine = 32mm

 

[Guest]

I believe yours is the same as mine = 32mm

Yep, 32mm is correct! I spent a bit more time trying to measure mine and got a proper reading. Quick trip to the local Menards store and I had a 32mm deep impact socket. Spun the nut off with my Milwaukee cordless impact tool after about 10 seconds of "hammering" with the tool.

Thanks guys!