SOHC.co.uk Forums > CB350/400
Pitted tappets, mashed valve ends and a loose primary chain?
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
Trigger:
Lynx, these are guide's , not tensioners . I think they are listed as safety guides by Honda. They are to stop the chain chewing the casings, which would result in a blown engine.
Lynx:
But the chain does actually run on it doesn't it?
Sent from my HTC Desire C using Tapatalk
Trigger:
Yes, it always is in contact with the bottom one,(when worn) running in oil. The top one only makes the slightest contact when new. The protector guilds are held in by 2, 6mm bolts. when the chain is in bad condition the bolt head show marks.
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