SOHC.co.uk Forums > CB350/400

Engine rebuild questions

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Greg65:
and the other half.

All the other bearings are similar. Use, refurbish or a pile of scrap?

Orcade-Ian:
It really depends on how much you want to spend and more importantly what you intend using the bike for when it’s done.  In an ideal world you would either replace the camshaft, head and cover with new.  Another route would be to have the cam metal sprayed and reground to size but the head and cover are almost impossible to reclaim due to the specialist machine Honda used to produce them - they can’t be line bored with those blind ends.

Now to the real world:  I’ve seen much worse on nicely running bikes and if this bike is only going to be used carefully and not on a daily commute of hundreds of miles and providing the measured radial bearing clearance is within limits then I personally would use those parts again.  The other question I would have is are you replacing, or at least checking big ends and mains and oil pump - they have had the same diet of contaminated oil?

I’m sure Trig will have strong views on this

Ian

Greg65:
Thanks Ian. I will get the micrometer across the part tomorrow and post the details.

Now back to the tacho drive. After a bit of a wash the circlip stuck it’s nose out far enough to come out easily. Any tips on how to release the old seal as it seems to be “welded”, or to I just dig in.

Thanks,
Greg

Nurse Julie:
Put a flat blade screwdriver through the hole and on the the underside of the lip and prise it up, if it doesn't budge, pick at it. I had a seal that was well stuck in place, got it all out in the end.....in 87 little bits  ;D ;D

Greg65:
Orcadian. Yes the big ends will be inspected  and bearings replaced. I will also strip and replace seal in the oil pump. The cam measures within limits so I will reuse.

VHT paint. Rattle cans, if so how many will I need? Or use a spray gun, if so which paint is recommended?

The copper washers that are used on the cylinder head, can they be annealed and reused?

Thanks Greg

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