TheodoreVH
CB750 New member
I have a 1978 Honda CB750K. When I was idling the bike, the camshaft drive chain sounded like it was loose and hitting something. The Cam chain tensioner had already been completely tightened and the sound persisted. I pulled the engine and took a look at the Cam drive to find that that the tensioner roller (the small on) has chain grooves... which I'm assuming means its pretty worn? Furthermore the chain cover on the valve cover has a large piece missing from it and looks like the chain had been rubbing against this and wore it away (see the pictures). What I am curious to know is what I should do going forward... I know that the Cam chain guide roller probably needs to be replaced as well as the Cam chain (using a master link technique) but I was wondering if I should check or need to replace the Crankshaft Cam Drive sprocket? First I don't know whether I can even check the Crankshaft Cam Drive Sprocket without pulling the bottom end apart which I want to avoid. Does anyone know if they wear easily? Similar question with the main drive chain (just curious)? Also because there is now a piece/pieces that possibly have gone through the engine... is there anything I should check or inspect to ensure that the engine is okay?
Here you can see on the Valve cover the part the chain wore away. Its not too bad. I'll probably just have it welded
In this picture you can just see the Cam Chain Guide Roller and see what I mean by the grooves in it
My main question is... How easily do the Crankshaft Cam Drive sprocket wear? Are they pretty resistant? Is this a common issue and how do most people fix it? Thanks
Here you can see on the Valve cover the part the chain wore away. Its not too bad. I'll probably just have it welded
In this picture you can just see the Cam Chain Guide Roller and see what I mean by the grooves in it
My main question is... How easily do the Crankshaft Cam Drive sprocket wear? Are they pretty resistant? Is this a common issue and how do most people fix it? Thanks