SOHC.co.uk Forums > CB350/400

Pitted tappets, mashed valve ends and a loose primary chain?

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Trigger:
A primary chain has No guilds or adjustment. Just make sure it is not touching the casings. It needs a little play.

Bryanj:
A new chain when first fitted will have nearly zero play, Ive seen totaled ones at 20,000 and good ones still at 60,000. depends of level of thrash and how well iwas kept in tune (especially carb balance)

Trigger:
Good call Bryan and Oddjob. I did take the measurements of a new chain for a 400F. But as normal i wrote them on a post it note and now can't find it.

DayvW:
Thanks again guys.  That tip on replacing bits sounds very sensible .. I was getting there in my thought process (was baulking at the price of a primary chain - but you are quite right - and though I will do OddJob's test - I cant believe its supposed to be as slack as it is (wonder if that was the source of my weird noise the subject of another post?!)) - but advice from people that know is exactly what I need!  Especially useful is advice on how you know when stuff is worn and what to look for (thanks OddJob).  I am planning to take everything out prior to soda blasting - so can look at state of the cam chain tensioner and guides (with the head off the guides look ok - but I will replace them anyway - along with the chain).

Thanks once again!  I will report back on findings in case discussions such as this help others.

Lynx:
The primary guides, listed here as No. 142 put some tension on the chain when the crankcase halves are together.
http://www.cmsnl.com/honda-cb400f-england_model14639/partslist/E01-3.html#results

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