Hey guys new here I have been looking around the forums for ideas but I have had several engine and carb problems over the last year with this project. I have a DOHC 81 750C I am currently dealing with a no start issue after fresh piston rings, top end gaskets and seals. I believe it’s timing related but I don’t know for sure. I followed the Honda manual for reinstallation, aligning the 1,4T mark, #1 cylinder cam lobes pointing to spark plug, and timing marks on cam sprockets parallel to the head. I lapped the valves, and shimmed to .005” After I put all this together and cranked it over it would not start and after about 7-10 cranks it lets out a huge backfire and that’s it. Checked compression and it read 100 on all cylinders. I figured that given all cylinders were even it could be timing related but I just don’t know where it could have gone wrong. Any help would be appreciated as this thing has just left me scratching my head.