Chris in Dorset England
CB750 Addict
My engine rebuild has come to an abrupt halt. The problem is fitting the exhaust cam chain and sprocket to the cam. The sprocket fits on to the shoulder on the cam, without the chain, the chain fits on the sprocket when the sprocket is NOT on the shoulder. However with the chain on the sprocket it will not fit on to the cam shoulder. It's almost as if the chain is too short. I have checked that the chain is seated on the crank correctly, not easy to see though. By sheer brute force I did manage to get the sprocket on to its shoulder but the chain seemed excessively tight and anyway the punch marks were way out of line and the sprocket was jammed, so I had to push it off again. The timing marks on the ATU were correctly aligned and # 1 cylinder cam lobes pointing at the plugs as per Honda Manual. All tensioners have been back off and locked. I'm at my wits end with this, I really do not wish to strip the engine down again. Any suggestions anybody, please