Most engines do not need any sort of sealant on these gaskets, but some are troublesome and need a bit of help to not leak. If they have been assembled into an engine, they are no longer new. The case? The engine runs fine, revs up great, but i'm at the loss of what the leakage issue might be.Īny ideas or suggestions are highly appreciated. I haven't checked the head surface for warpage, could this be The left side of the cylinder head gasket (near the front stud), which is gone now.Īt this point i'm not sure what i'm doing wrong. Before i re-torqued the head again, there was a bubbling on On the right side of the cylinder head gasket. Started and ran the engine today for a good 10 minutes, head cover no longer leaks, but i noticed bubbling Head o-ring and then torqued everything to the manual's spec. So, i removed the head cover, got some silicone over the Re-torque all bolts after a few good head cycles. From what i read online you're supposed to Some silicone over the the head, but didn't on the head cover. Head and head cover both have a rubber o-ring, so i put

Head o-ring and 2 small leaks from the head cover. The first time i put the engine together and after the first 5-ish starts (~5-10min) there were no leaks,Īt some point the cylinder head had developed a few small leaks, like air bubbling out the head base gasket, Engine has been rebuilt:Ġ.5mm rebore, new gaskets, pistons, rings, cam chain, cam chain tensioner, seals, valves, valve springs, This is my first project and i've pretty much gone through the whole bike. I've been working on this 75 KZ400 for quite some time and finally getting close to the finish line.

Kawasaki kz400 head gasket sealant