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Mike's CB550 Project
K2-K6:
Superficially looks like aluminium "powder" from either machining or wearing.
It usually has a grey type look about it.
Maybe worthwhile draining and cleaning mastercylinder, then refit and try again to assess from there.
To quantify wear, working on many cycle hydraulic brakes, it's something that shows in system with both aluminium bore and aluminium piston together, also when you use abrasives on aluminium it first gets grey, then black-er as it removes material. Unlikely but possible from initial movement.
Cleaned out and with refill, at least you can see if it develops again in fairly short order.
Mike_Berkshire:
After a brief period of inactivity, I have sorted the front brake as recommended and it seems good now; I wont know more until I have a proper rolling chassis and at the moment I just have the front wheel but it is beginning to resemble a motorcycle as opposed to a box of corroded and dirty bits. Next is overhauling the wiring and Im not sure where to start. There is one green ground cable that has melted through the insulation at some time in the past. And from the black masking tape wrapping' I guess the loom has been worked on by the PO at least once. Also a lot of corrosion in one of the connector blocks and much general filth.
A good ponder before action I think.
Bryanj:
That green wire melted cos the main earth was not a good connection and the starter load has to rarth somewhere!
Mike_Berkshire:
That’s really helpful Bryan; thanks. At the other end of the wire is an earth tag that looks as if it should sit under one of the coil mounting screws. Do you think it likely that this is where the poor connection was or would it be where the cable from the battery is earthed? I will replace this wire when I clean up the loom/connectors.
Bryanj:
Its the main battery cable connections, people paint the engine bracket and electrickery wont flow through paint! Needs to be clean bare metal against crankcase and for cable to go too.
Yes that gable grounds at coils
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