SOHC.co.uk Forums > CB350/400

Engine rebuild questions

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Dolomite_:
I've just finished stripping the engine, just the valves to do. What are the main things I should check for? The bike has done 28k miles.

I'm already planning on getting new big end bearings etc and replacing the cam tensioner and cam chain.

The primary chain seems fine. How much play should there be?

The pistons seem fine to me, how should I judge if I need to get some up sized ones?

Some of the crankcase bolts were a bit naff and one rounded off, does anyone know anywhere that does some good quality replacements?
I've found these https://www.ebay.co.uk/itm/262689167997 are allen heads fine? I cant seem to find any hex bolt sets.

Athame57:
If a primary chain is stood upright and the top half sags enough to make contact with the bottom half its time to change.

Nurse Julie:
Knackered Vs new

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Bryanj:
Shells rarely need changing, Julies picture is of a useless chain and it you fit new also chage rubber dampers in primary drive.
Check tensioner horseshoe for free movement and tensioner lock bolt ans plunger

Matt_Harrington:
Westfield fasteners will do most of what you want (there is another supplies but I can't think of them on a Monday morn!)
I'd replace the camchain as well.
As Bryn says, unlikely shells need changing. Check if the cylinder bore look OK and if there is a lip at the top.

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