Yep, I browsed through JTSprockets' website and have found a number of bikes which seem to use the same rear sprocket.

For the sake of being certain, it is a sprocket with 5 fixing bolts, with a 110mm circumference for the bolt pattern.

Front is JTF 513, rear JTR 829

Is that OK?

Hi Hutch
I did it and was driving today (200 km or125 miles) on different roads, small curvy ones to highway and town, I used the same sprockets that you did 17/43 and bought a SO530 Oring chain 110, did remove 2 links then it was done.
As spacer I used 7 splinced lockwashers, orderd 9 from the Suzukishop but needed only seven to take up the space, I did make a piece it stainless steel, 25 mm dia. in the hole and 40mm outside dia. The thickness of the spacer should be 7,5mm if making one. But ended up using the washers when I got them yesterday.
There was some problems about the Oring chain, its is a bit wider than the one you used so I had to remove the bracket to the chaingard on the swingarm, both on top and at bottom, not to bad at the bottom but the chain bent it backwards so I did remove that one to.
I can still use the chaingard if I want because I made a spacer that has a slice on one side so I can put it on the axel at the inner side of the suspension if I dont want the chaingard.
Its like you say totally diffrent bike to drive, a lot nicer but I think I will go for the 16 in front, going to bay that on monday and make a switch, I found it a bit difficult to find the right gear sometimes 2 or 3 when driving very slow in town, and I didnt have mutch use of the 5 gear exept on highway, gear 4 is now a bit higher then gear 5 was before.
So from the 14,5 % I will try 9,5 instead.
And I think it should have been better to use 17/45 instead of 16/43 because of the tight space to the swingarm at the fronpully, but I am to lazy to change both for the moment.
Final conclucion: I LIKE IT  GREAT
And thanks to Hutch and Tblam and the rest of you that start all investigation and made it possible for this swap.
Pics are comming later.
Sorry for the spelling, but its not my languish.
Odar in Sweden

I think you should stop this guy from putting on 17/39  his bike its going to be a dog.
Have you tryed the 14/43 on your bike, not that I want to go back to original gerings but I wonder does it fit or does it hit the swingarm close to the front sprocket?
You know I going to buy 16 teeth tomorow and wonder if it is possible to put it on, might have to bend the top ear for the screw to chaingard a bit out.
This chain is defenitly wider than yours.
Odar

Odar wrote on 12/31/69 at 16:00:04:
 
Yes I tried the 14 and it was almost the same as the stock gearing. The chain didn't hit the the swingarm at the front or the chain/belt guard brackets, so the o-ring chain is definately wider. I will have to make a note of that in the tech section. I also tried the 16 tooth and had no problems. You can even use the same chain length, it falls a little past the center of your adjustment. You can leave it that long if you want to switch back and forth between sprockets, or shorten 1 link if you decide to run just the 16.The 16 is perfect for hilly riding or town(3-4th gear), but still is better for highway riding than stock. Let me know what you think of the 16.    Hutch

mpescatori wrote on 12/31/69 at 16:00:04:
 

The chain you need is the 530 series. I looked up the JTF566 sprocket on the JT web site and it says that there is no listing for it. Could you have typed it wrong?? All those extra holes are for is using a puller to get a stubborn sprocket off. As long as you get the front sprocket from one of the models listed for the JTF513, you will have no problem. One other thing to note is that it seems the o-ring chain is wider and causes problems with the 4 belt guard mounting brackets. I am running a non o-ring, and have had no problem at all with the chain hitting the guard brackets. I haven't tried a 13 but it might have a problem with the chain hitting.  Good Luck, and let me know how it works out.   Hutch

The JTF 513 is listed as alternative for the JTF 566, but click on the lin566 in the 513 page and it will say the 566 is discontinued.
So that explains it.
I also understand your concerns re: the chain rubbing against the (swingarm?) brackets/chainguard, maybe I understand what you mean maybe I do not - technically - but I do understand what you mean from a purely conceptual point of view - the front sprocket being so small the chain will rub against the swingarm etc.etc.

I remember whan, in the '50s, an Italian mechanic came up with a "hi gear/low gear" contraption for motorcycles, mainly aimed at working trikes (with a small flatbed on the back): the final drive would only reach halfway, where a 2nd stage final drive would allow for two ratios with a floating sleeve, which would engage either a 1:1 ratio chain driev, or a 1.5:1...3:1 chain drive. Easier to see than to describe really. Extremely popular with the heavier trikes that would routinely carry payloads up to 400Kg. (900lbs) Old Guzzis Hercules and the like

Still, a similar contraption would allow to determine two final drive ranges on the same bike for flat or hilly riding, say a 3:1 and a 2.6:1 , just pull over, neutral, twist handle this way or that and you're off !!!

Should research this, actually...

Hutch
Dont worry my friend, its good if you make it as short as possible.
I let you know tomorrow, and hopefully some pics as well.
Odar