SOHC.co.uk Forums > CB500/550

500 big bore

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Oddjob:
It’s the reinforcement pillars around the bore holes in the crankcases that cause the problem Tim from what I understand, the liners being bigger don’t have the clearance to operate or even fit in some cases. After a certain engine number Honda addressed it and reduced the pillar sizes to allow the 550 barrels to fit.

As yet I don’t know if my 550 barrels will drop onto to my 500 cases as the engine is still all in one piece and will be the last thing I do on my restoration. If it’s a problem I’ll try and fix it. If I can’t I’ll revert back to my 500 barrels.

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