.Tell us more about the bike and motor. Aren't the cases different from the 125? Is that a canister fork bike?
I still have my '77 IT 175 in pieces. That was a great motor in its' day but I don't know if it has anything in common with the '76 YZ.
You gonna race this bike Kurt?
Just don't see many 175's on the gate.
here's one
http://www.ebay.com/itm/76-Yamaha-Y...Parts_Accessories&hash=item48546b0d6b&vxp=mtr
I typed in YZ175 cylinder on Ebay and there was a head too...