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530 Conversion

mcycle-nut

mcycle-nut

Forum Mentor
Past Site Supporter
Charter Member
Just some info that might be of help to some of you. I did a 530 conversion on my '78 GS750. I used a JTF-518-17 front sprocket, and a 45 tooth rear. It wasn't a JTF sprocket on the rear, but a JTR-816 should work. If you use those sprockets, the chain will have to be 112 links. This will give you a final drive ratio of 2.65. The stock 15/41 combo gives you a 2.73, but I wanted to lower the revs at highway speeds, so I went with the different ratio. 8)
 
530 conversion

530 conversion

mcycle nut,

What swing-arm were you using? I'n planning to do the same conversion but don't want to order a chain that's too short! (done that before! :oops: )

Thanks,

Tony.
 
Remember the differece in link size=lenght.
I did the same thing, used about 110-112 links on a 1980 GS1000S with a
1100 swingarm on it.

I used 2 large washers from the local hardware store.'
Just be careful the washer doesn't interfere with the chain/sprockets.
Too big a washer will not allow the chain to fit into the sprocket completely.

Here's the link
http://www.thegsresources.com/_forum/viewtopic.php?t=20879
 
Acceleration

Acceleration

Hey M-C Nut, how much difference have you noticed in acceleration?? It sounds like a nifty idea but I'm a little concerned about that. Thanks! :lol:
 
I'm confused

I'm confused

I'm a little confused about that. If you switch to a smaller rear sprocket, you'll cruise at a lower RPM.....but, that should also reduce acceleration...right??? :?: It's certainly not possible to have both. 8O
 
It's a minor change.
It drops the rev's at highway speeds, but you can always downshift when you need that little extra. :D

The physical size of the sprockets and chain do make a difference.
I left the gearing stock on my 1000.
The acceleration from stop and just overall acceleration is noticable.
 
Yes

Yes

Thanks...yes, I knew there had to be a lack of acceleration performance but I didn't know whether it would be noticeable. :? Sounds like it is....
 
Re: Yes

Re: Yes

chuckycheese said:
Thanks...yes, I knew there had to be a lack of acceleration performance but I didn't know whether it would be noticeable. :? Sounds like it is....
Click to expand...

Not really. I had been running almost the same ratio (2.6) with the 630 setup. It's been YEARS since I've run the stock ratio. Actually, I notice a little BETTER acceleration performance, but that's probably due to my carb guru fine tunnig my carbs. Then again, lighter chain and sprocket, less unsprung weight, this equals better acceleration. :D

Oh yeah, I'm running the stock swingarm. 8)
 
Chucky,
Also cheaper to replace.


the 630 size chain was more $$$ as were the sprockets.

I used a DID o-ring and Sunstar steel sprockets

Chain from a friendly dealer was $69, sprockets were about $65 total.
 
Hey Keith -

When you say you used "2 7/8" washers, one on each side to shim the front sprocket" - do you mean 7/8" thick or 7/8" fastener diameter? It will probably be obvious to me once I go to the hardware store but I found the parts books description a little cryptic ("use 6mm washer"). Since I'm using a different rear wheel I'm having too much fun getting everything lined up...

Thanks!

Jim
 
Re: 530 Conversion

NO you can NOT use 630 sprockets with a 530 chain.
the chain will not fit on the sprocket.The sprocket will be too large for the
links to fit on the teeth

I used 2---- 7/8" washers on the primary sprocket. One on either side.
Lined up fine.


GS750 said:
mcycle-nut said:
Just some info that might be of help to some of you. I did a 530 conversion on my '78 GS750. I used a JTF-518-17 front sprocket, and a 45 tooth rear.
Click to expand...

WoW! this JTF518-17 front sproket isnt made anymore, but is actually showing as using a 630 chain. Can you do that (use 630 sprokets with 530 chain??)

http://www.jtsprockets.com/fileadmin/Code/images/large/jtf518.jpg

http://www.jtsprockets.com/61.0.html
Click to expand...
 
OOOPS! I goofed! I meant to say the front sprocket I installed was a JTF 513-17, NOT a JTF 518-17. Sorry for the confusion! :oops:
 
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