Annoying sound from my CB750

[72texas350]

Anyone know what this sound might be? The bike is a '78 CB750k. I just replaced the cranks case and this was the 3rd or 4th time I have started the engine since. I haven't been able to figure out what the sound is, but it sounds like it is coming from the top end. I have triple check all the valve clearances and made sure that oil is getting all through the engine. I'm out of ideas as to what may be happening.

http://youtu.be/7oZpifTbwb4

 

[rockcitycafe]

Whatever it is, it's not going to be fixed with the engine in, take it out and do it over


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[ApriliaBill]

Of course not being able to stand next to the bike, limits me from knowing approx. location of noise, but it sounds up top, like maybe the rocker arm......

 

[72texas350]

I adjusted the exhaust header and replaced the gaskets again. I think this may have solved the problem, but I'll have to want until after work today to let the bike run for more then a couple of seconds. The sound is defiantly higher up. I thought it was something with the valves or rocker arms, but now I think it may have been the exhaust.

 

[72texas350]

It looks like that problem is fixed. I guess it was a loose exhaust gasket, but I'm not completely sure.

 

[72texas350]

Thank y'all for your help!!