1981 CB750 C custom "DOHC" Engine ISSUE

Posted by Dwrecktum on Sep 11, 2010; 8:53am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1981-CB750-C-custom-DOHC-Engine-ISSUE-tp1456569.html

Recently I purchased a 81 CB 750 custom, aside from the tank it looked to be in excellent condition except a few minor dent in the tank but the owner said he never tried to get it running and had no idea what was wrong with it... I thought for 300 dollars I want it! Got it into the garage and got into tinker with it... cleaned and lubricated the carbs up real nice... gotta battery onto it and tried to turn it over with nothing but some clicking... Pulled the plugs to release the compression and see if it would turn over... Still nothing... Thus I have a seized engine and need a little guidance as to what my best options are gonna be... I'm willing to rebuild it... I will be pulling it apart soon to see whats actually seized whether its in the top end or bottom...
So: A couple questions
1: Is it common for these engines to seize? could there possibly be something that i'm missing?

2: If i get new pistons and rings how exactly do I know what to get the cylinders bored to??? (of all the fucking around i've done on quads and bikes i've never had to replace a piston) Lucky me i suppose...

3: I'd love to take in any pointers involving this engine I currently don't know a pile about it... Which as of tonight I realized i'm gonna get to know this engine better than I thought I would :) lol :(