Topic: Help ID my MC PLS

[The Cheese]

I have recently gotten serious about getting this bike on the road. Hit a wall now. The PO must have swapped the MC out. The parts I bought for it are way off. Honda lists the correct rebuild kit as:  45530-ma5-671.  Piston size is 16mm. WAY to big.

The MC on the bike says Nissin, so I know its Honda. Has 1/2 stamped on the outside of the bore. A sight window. All cast(No plastic cup).  Has 8k41 other side of bore. Has 97 stamped next to h.bar mount.
Brake light switch ( ALPS JAPAN PAT.P on bottom 822y on top)

My options are, Get a correct MC with a crappy plastic cup, 
                         Try to find rebuild kit for this one,
                         Buy a new complete mc from eBay.

[KingCustomCycles.com]

What bike are you trying to get a correct master cylinder for?  The one pictured looks Magna, Shadow, Saberish.

[The Cheese]

My bad, Should have stated. It is 1981 CB650 Custom. The same in my sig. Thanks
Michael

[The Cheese]

bump