Re: 1973 CB350... my first bike build
First you gotta tell us where you've looked and what you want to spend (assuming more than $1).
Right off the bat, eBay is chock full of CB350 pistons and cylinders. You can buy a used setup from someone and cross your fingers, or you can do like you say, and jump 0.25 up and get a fresh bore.
Here's a Honda kit for 0.25 over at $170 for the pistons and rings.
http://cgi.ebay.com/ebaymotors/Honda-CB350-CL350-SL350-PISTON-RING-SIZE-0-25-OVER-_W0QQcmdZViewItemQQhashZitem3cb313e9c2QQitemZ260702464450QQptZMotorcyclesQ5fPartsQ5fAccessories
Here's another kit, for $70! Including pistons and rings, again, 0.25 over
http://cgi.ebay.com/ebaymotors/vintage-Honda-motorcycle-piston-kit-CB350-S1-_W0QQcmdZViewItemQQhashZitem19c1b74877QQitemZ110624196727QQptZMotorcyclesQ5fPartsQ5fAccessories
So there you go for pistons and rings.
First you gotta tell us where you've looked and what you want to spend (assuming more than $1).
Right off the bat, eBay is chock full of CB350 pistons and cylinders. You can buy a used setup from someone and cross your fingers, or you can do like you say, and jump 0.25 up and get a fresh bore.
Here's a Honda kit for 0.25 over at $170 for the pistons and rings.
http://cgi.ebay.com/ebaymotors/Honda-CB350-CL350-SL350-PISTON-RING-SIZE-0-25-OVER-_W0QQcmdZViewItemQQhashZitem3cb313e9c2QQitemZ260702464450QQptZMotorcyclesQ5fPartsQ5fAccessories
Here's another kit, for $70! Including pistons and rings, again, 0.25 over
http://cgi.ebay.com/ebaymotors/vintage-Honda-motorcycle-piston-kit-CB350-S1-_W0QQcmdZViewItemQQhashZitem19c1b74877QQitemZ110624196727QQptZMotorcyclesQ5fPartsQ5fAccessories
So there you go for pistons and rings.