Oh Cock!

[warren3200gt]

Current 650 build has come up against a snag. Its a 530 chain but has 900 a4 CMA's so needed a 530 900 rear sprocket. The only one available is a 47 tooth. So I compensated by increasing the front sprocket to keep the stock ratio the same. But this has caused a problem. The chain run now touches the Dresda Box section swing arm bracing. So tried a stock front sprocket to lift the chain a tad but it's still just scraping even with the rear shocks under load.
So my dilemma is 1, find a 36 tooth A4 rear sprocket for a 530 chain or 2, take a chunk out the swing arm brace.
Unless you bike builders can come up with a simpler alternative. which would be nice as taking a chunk out is a pain and a smaller diameter sprocket doesn't appear to be available.

[garyd]

How about a chain tensioner like the one Harris use?

Lift it up from below.

anyone got a photo?

[garyd]

Not exactly the one I was thinking of but it give you the idea.

https://uk.pinterest.com/pin/509962357778688027/

[Pigford]

Here's mine.....




By Monster Craftsman http://www.monstercraftsman.com/categories/Tensioners/

[Ginger Bear]

Chain tensioners....... http://www.monstercraftsman.com/

B&C or Talon should be able to make you a sprocket to fit your requirements.

B&C made me a 38 tooth 530 sprocket a few years back now. Infact it's still in it's original wrapping, unused, in the bottom of my tool box.

[Ginger Bear]

Looks like Piggy beat me to it.

[zed1015]

6 bolts fixing?
Pretty much most modern Kawasaki's use the same fitting.
ZXR750/ZX9/ZX10R/ZX12R etc.
Most use 530 pitch so shouldn't be that hard to find a match.

Try JT here - The JTR448 goes down to 38 tooth so not far off.
http://www.jtsprockets.com/catalogue/model/5595

Some nice ally ones here go down to 36tooth but pricey
http://global.rakuten.com/en/store/bike ... /10362343/

Or you can buy piloted blanks from Dennis Trollop racing and drill your own bolt holes.

[warren3200gt]

Ooops error in original post, standard 650 is 42/530 so 6 hole with 42 tooth 98mm dia centre hole with 6 bolt 130mm c/l dia holes.
Can't find one on JT with the correct holes for a 530 chain
I like the idea of a tensioner though, kinda fits the bikes theme, if I can find a black/silver one that fits either the swing arm (50 x 25 box) or the bracing (40 x 20 box).

[ADE]

B&C made me one a while back
Ade