Thanks!
Here are some photos of my 520 conversion. The rear sprocket is for a Suzuki DR 750 and the front sprocket is for various 90's Kawasakis. The chain is a very narrow d.i.d chain.
Front first. The sprocket has a section which is 2.6mm wider as shown here:
IMG_20180809_171020 by
Lars Krogh-Stea, on Flickr
On the inside of the sprocket I have 6mm spacer similar to the one you see between the sprocket and the nut. The reason I have a spacer on the outside is because I'm missing the retainer washer. It's in the mail.. When I had it mounted like this the chain was to close to the rear tire. I flipped the front sprocket and put two 1.3mm washers behind the rear sprocket. Now there is 7mm clearance between chain and tire. I believe that is enough. I will at least try it for a while. With this configuration I can also use the original rear sprocket bolts.
IMG_20180809_172232 by
Lars Krogh-Stea, on Flickr
IMG_20180809_172737 by
Lars Krogh-Stea, on Flickr
IMG_20180809_172701 by
Lars Krogh-Stea, on Flickr