Honda-SOHC

I've just refitted new pistons and rings into freshly honed and thoroughly cleaned cylinders , having checked all end gaps and spacing are OK. I very lightly oiled the rings & pistons before installation and they all went in perfectly, after a bit of faffing.  On rotating the crank I can hear a 'rubbing' sound as the pistons move through the bores.  Is this normal? I was perhaps naïvely expecting a nice smooth, silent rotation. There's also now some very light vertical discolouration marks in the bores, visible in the residual oil film left above the pistons after the rotation. Do these perhaps mark the piston ring gap position? Should I dismantle, check and re-fit the rings? Your advice would be greatly appreciated. Thanks.

I was short of this washer but a member had a spare one but spotted this on ebay that includes the washer - expensive for a washer but better than none! The 'shim' is hardened - I can provide sizes if you want but before I got one, I struggled to find anything generically that was similar

https://www.ebay.co.uk/itm/35385581182
Brilliant, thankyou!

I'm making my way through my rebuild and notice I'm missing a part for the starter gear:

https://www.cmsnl.com/honda-cb750f1-super-sport-1976-england_model14680/pl-gear-set_28109300000/

It doesn't seem to be available but looks very simple.  Does anyone know of a work-around, ie using/adapting a standard washer?

Cheers