Put some sealer on the nuts and keyway on the crank gear. It'll leak air otherwise. Did you get the crank trued and welded? How basic if a build is it? Pipes and a buncha other to fast parts? There's a few little tweeks you couldn't prob make to make your life easier. Get a pancake bearing setup for the clutch. Get a decent billet impeller for the w/p. Ive never had good luck with the crappy paper base gaskets. I started using the composite ones. Never leaked since. Maybe if you have a paper one or singles use some aviation gasket sealer goo on it. Might consider blue loctite on fasteners inside the engine. Check the kickstart idler gear for wear. Those are good for wobbling then spitting the washer and c clip off. There's prob more but I'm drawing a blank. Oh, how are the bushings on the clutch basket? Or u using a new one?