SOHC.co.uk Forums > CB500/550

CB550F2 Cracked rear engine mount

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TrickyMicky:
Can't help re. the stubborn bolt, but, many years ago I worked for a firm rebuilding gearboxes, and now and then we would receive a mini box (alloy), with a corner knocked off where it sits under the cylinder block. We used a product called Belzona with good results to rebuild the corner. It could be machined and drilled. We tested it once on a scrap casing with a club hammer, the casing broke beyond the repair!! Wishong you the best of luck.

Oddjob:
You cannot replace just the bottom casings, they are machined as a pair and must be replaced as a pair. You then need to calculate and replace the crankcase shell bearings as they will most likely change due to the change in casings.

A cheap pair of casings is the way to go imo.

Seabeowner:
I have some 550 cases. They were probably off a 550K0. About £45 or make an offer, but don't want to go to the bother of posting them. Buckinghamshire is just across the Thames from me. But then you will have the problem of shells. They are marked BBABB.

mtrhead:
Many thanks to everyone who replied, really appreciate the feedback and various perspectives!
I'm going to have another go at it tail end of next week (away at the moment) and will update on progress or otherwise.

Just in time for Halloween, welcome to my nightmare, photo attached, complete with broken casting, side of the bolt attacked with a grinder, mullered nut and sheared off end of the bolt, all the white gunk is corrosion!

Seabea,

Really appreciate the kind offer, can I have first dibs at that price but will let you know once I've attacked it one more time? Give me till the tail end of next week and if its defeated me  I'll venture south of the river. As far as I can tell the upper/lower crankcases of a K0 will fit the frame and top end of  a CB550F2 right?

Bryanj:
All the sohc 550 engines are the same just numbers vary, there are some parts that are worth changing whilst in bits, my email is in my profile if you want i can tell you what and where to get best prices from

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