I'm using a modified Sierra prop shaft on my Indy to link my ZX9R to the diff. Is there a preference to using a 1600cc or 1800/2000cc in terms of strength and weight?

Don't know anything about the weights. I doubt the length matters as its lengthened for a BEC.

I just re-used the 1.8L one that came from my donor. The main thing is that it the UJ fits the Diff flange of cause.

Mk Engineering did an excellent job of modifying it for my Fireblade for £55.

I also got a sprocket adapter from them for another £55. However they forgot to tell me that you need a shim/collar fitted behind the sprocket adapter before you can fit it! It's not exactly your average washer/spacer so it's all sitting on my work bench whilst I sort out the spacer It looks nice though

Roger