Hi,
I've just joined up. Been riding for 20 odd years. In 2020 I bought my first classic bike, a 1975 Norton Commando 850, which I love. In March his year, I scratched another itch. I bought a UK spec CB750K6.
I did not buy wisely! I managed to get it running sweet enough, after a bit of work to the carbs and ignition. It was not burning oil. But it had a top end oil leak, a sheared front centre head bolt (the external one) and plugs 1 and 2 were sooty. But I did get a few runs over the summer, which was enough to tell me the bike's a keeper, so I need to fix it.
Engine came out in October. The head was not as tight as I'd expect. The gasket faces between the head and cover were both very badly damaged. They'd been gouged from prying apart at some time. Clear daylight between the faces. I sourced a better 2nd hand head and cover. Also, the cam chain was timed 1 tooth too early. Had the cylinders checked and honed for rings. They are not in the first bloom of youth, but serviceable for a few more years. Also, the exhaust valves had a small amount of play in the guides, but less than the head I'd just taken off, so I just lapped the valves and put new stem seals in. The primary chain was in spec and cam chain feels fine and wasn't using up much adjustment. So, I decided not to take the bottom end apart.
Maybe I'll regret not going deeper, doing a rebore and valve guides, but I have time and I'd spent enough getting to this stage. So I decided to put the engine back together. In the meantime, I stripped the bike down. The frame and brackets were blasted and powder coated. New steering bearings and Hagon shocks, to replace the old shocks, which had very little damping left. The wiring loom had some dodgy household connectors, now replaced. I just cleaned the rest up, hoping it hasn't objected to being disturbed!
Next stage is to re-fit the engine. Friends are coming round next week to help me lift it in.
So, quite an introduction to my CB750 ownership. I've searched topics on the forum, for advice and doubtless, will be doing the same in future. So, I thought I'd introduce myself.
Regards, Martin
