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Partially Restored 74 CB550

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taysidedragon:
Well done. Such a relief when it works. 👍

davidcumbria:
So another good day yesterday. After filling the sump with Castrol power 1 10-40 semi synthetic I wanted to check that the oil system was working properly since one of the original reasons for stripping was a dry and noisy top end. Even though everything coated in assembly oil  to minimise initial wear on my new bearing shells I tried to syringe oil into the main feed through the centre filter hole but not too much luck there. Then I did manage to get over 0.2l down the pump oil pressure  switch hole which looking at relative heights should have partially  filled the oil filter, it’s feed drilling and primed the pump.

With no looms in place I wired a test bulb in series with oil pressure switch to positive battery and used a starter lead between earth battery and the engine casing illuminating the bulb. Finally connected the other starter lead between the starter motor cable ready to touch other end on battery positive. No spark plugs or valve cover in place so minimum resistance, maximum pump speed and easy to see any oil delivery into the bath at the ends of the  cam shaft.

First spin was for about  3 or 4 seconds light on, no pressure and no oil at the top. As expected but hopefully not too much more of this. 😐 Second spin light went out and oil flooded the baths to their limit so I had to stop after a couple of seconds  - a really strong flow so much better than before stripping. As Alan Millyard would say in one of his brilliant YouTube videos ‘ I was really pleased about that’  😀👍

McCabe-Thiele (Ted):
Nice one Dave I haven't turned my engine over using the starter motor yet - its not far away though.

Oddjob:
I tend to test mine with the cam not in place, I just hold the camchain up on a socket bar or screwdriver. No plugs of course. This way all the oil holes are exposed and IF anything did come up with the oil, like a speck of rust or maybe some blasting media you can see it and it doesn't get trapped under the cam.

davidcumbria:
Edging towards getting carbs back together got all the floats and jets back in and reset.

 Wanted to try the clear tube level check while carbs still separate and was glad I did because first carb was dripping from the overflow.

using lungs to blow down the fuel inlet suggested float valve working ok.sure enough as well as dripping the overflow pipe revealed a nice jet of air into the removed and fuel filled chamber when gently back flushed with air. Classic split overflow tube which I soldered up per the you tube videos. All ok now and satisfying to solve the problem without resorting to the cheque book or pleading for spares. Other carbs ok and levels look consistent - close but not too close to top of bowl.

 Should have the carbs back on the bike this weekend. I do wonder if blasting air through the overflow while cleaning up the carbs should maybe have an health warning to take it easy on these vulnerable components.will never know if that’s what did it.  Any how -  Onwards….

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