SOHC.co.uk Forums > CB500/550

4 into 2 system?

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SteveW:
This is my one, no manufacturers marks on it:

Orcade-Ian:
Thanks for finding and posting the pictures Steve but I don't think that style would suit me.  If I could be sure that the basic head casting and therefore port positions and angles were the same on 500 and 550 plus the distance to mountings the same, then I might go for the Marving system.

Ian

Bryanj:
500 and 550 head are identical parts mate, footrestpositions might alter but bracketry is the easy bit

Orcade-Ian:
Thanks for that Bryan, it's very reassuring if the heads are the same.  Assuming they got the extra capacity on the bores on the 550 - I seem to remember you telling Ted that the cranks were the same. Then that means the deck height is the same so should only need the silencer hanger area possibly needing a couple of extra brackets - there's obviously one needed anyway on the left.  Looking at a pic of the 500, are the rear footrest frame hoops the same on 500 and 550, they look very similar to me?

Ian

Oddjob:
Not the same Ian, the 500 has solid frame lugs and the 550f has tubular frame lugs. It’s possible the 550 has them slightly lower than the 500 but there’s not a lot in it. Oddly the 550k3 having the four exhausts you’d imagine the level would be the same, it may be the brake pedal is the problem with it not fitting.

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