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Mike's CB550 Project
Mike_Berkshire:
I bought a new sub-harness and left hand switch control unit as the originals were completely trashed. Even though both were advertised as being for the '76 K2 3 of the wire colours were different in the handlebar control and there were a couple of differences in the sub-harness. Thanks to the answers from the forum I think I have sorted out these differences.
Im now slowly fitting everything back to the bike. I have mislaid the Ignition Coil wire protector (504 323 000) and I am assuming that if I cant find it then provided there is some protection between the coil wire and the weld seam in the frame to stop rubbing this is not an essential part?
I have also removed the tatty old insulation tape from the battery earth strap - see picture below. I think this may well have contributed to the poor earthing in the bike? I will be replacing the earth strap.
Mike_Berkshire:
Progress today. After setting the points etc and checking I had a good spark on all 4 plugs/cylinders I had the opportunity today to try firing up the engine. The bike started almost immediately and the oil light went out; I removed a tappet cover and could see there was plenty of oil finding its way to the top of the engine. From the sound and throttle response it seemed clear it was firing evenly on all 4 and the Delkevic 4 into one sounded great. Once it had warmed up I took the choke off and it ticked over quite nicely at just over 1000 rpm. It was a bit more clattery than I was expecting but I remembered that I hadnt adjusted the camchain tensioner since I had rebuilt the top end. After blipping the throttle I got a spot of hanging but didnt run it for too long as I wanted to get the camchain adjusted. As I didnt know how long it would be until I got the next opportunity to run it I let it run out of fuel to stop so the carbs would be left dry.
As it turned out I had some time later in the day so I adjusted the camchain tensioner and ran the bike again. There was less top end noise than previously but still more than I would expect so I will check/reset tappet clearances again before the next test. This time I got fuel leaking from carb number 2, I tried tapping the floatbowl with a piece of wood; quite hard. This made no difference, the leak seems to be from the top of the float bowl as opposed to out of the overflow pipe - this needs more investigation. Also, the hanging once warm was more pronounced as once warm and the throttle blipped it sat at 3000 rpm. Theres plenty of threads on hanging i will read through to see if I can work that out.
On the overflowing/leaky carb I am guessing there is no way round that apart from taking the carbs off (and the plenum etc etc - aaargh!) to investigate that - if anyone has any tricks and tips on that I would be very appreciative!
Overall though Im really pleased with the progress and thanks again all for the help to get this far.
Nurse Julie:
Well done Mike, I bet you're really chuffed to get it up and running. In the great scheme of things, the snags you have are quite minor. Well done.
McCabe-Thiele (Ted):
You might know this already Mike, I used Kens method for adjusting the cam chain. Holding the kickstart by hand so you are pushing against the compression, having released the tensioner lock nut. Having released the lock nut the chain tensioner will take up the slack, then just nip the lock nut in position. You can then tighten it up properly by using the screwdriver slot to hold the screw and a spanner to tighten it up.
Pretty sure that's how I did mine iirc.
McCabe-Thiele (Ted):
Apparently I have credited the wrong member it was Bryan, not Kens method.
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