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1976 CB550F1 (what have I let myself in for) Project

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Bryanj:
Lets just say new ones are over£100 just for the casting, US ebay seem to dell used for $75-$90

eight0:
Just a quick update as I've got no decent pics to share, I'll take some this week. 

I've got the carbs back from vapour blasting and rebuilt.
The bikes filled up with oil and I had it coming out the front where the filter goes before I put the filter on and now the oil light goes out when I crank it over.
How do I know if it's making it to the head? I cant really see much past the tappits and I've tried leaving the end caps off but not got any oil coming out there yet.

The main issue I have currently, a fairly large one is that I have no spark. I've got a Dyna S electronic ignition with aftermarket 5 ohm coils. I timed the Dyna as per the instructions. You time it at the advance mark and twist the counterweight to fully advanced and the light should come on then.

The coils did get quite hot when I was doing the timing so I thought I might have damaged them but they are still measuring at 5ohms so not sure. I need to do a bit more investigation, i've yet to test the pickups on the Dyna which should read infinite ohms on all ranges.

Any ideas on what else I can check?

K2-K6:
With the coils getting hot it shows they have power (+ positive supply) with the switching done by the earth line you can get them to spark manually.

With ignition on,  disconnect the "trigger" wires from coil to ignition system, then hold one of those wires (from coil) against an earth. Now when you remove that earth connection it should throw a spark out.

If it does,  then you'll probably need to check the ignition system's earth route to make sure it's competent.  They effectively use transistors to do as you've just done manually by switching the earth line on and off to make the coil discharge a spark. If the transistor can't get a decent earth route it may not operate.

K2-K6:
Oil feed to top end, it takes longer to get there and you've just got to check it probably when it's started.

Light out means the main crank feed is ok and up to pressure, which is good. It takes longer and more pump revolutions to get through to the head in much of an observable quantity.  Wait till it starts and keep checking as you have to see then.

eight0:
Ok thanks for the advice, I'll give that a go.

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