SOHC.co.uk Forums > CB350/400

New cam chain tensioner or not?

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Drew400:
Hello all,

CB400/4 - having shelled out (if you'll pardon the pun) for new crankcase bearings, ground-in my valves, etc. I'm considering replacing all of the cam chain tensioner parts. I read all sorts of stuff about how bad or neglected they were and, having seen lots of evidence of previous engine failures/rebuilds, I'm thinking that, as the engine is out and dismantled, I should play safe and order a whole load of new parts rather than risk reusing stuff.

Any views out there (I'm sure there are lots!). Replace all of the bits or just a few? If so, which ones?

Cheers and thank you, D.

Bitsa (Ralph Wright - RIP):
Drew
As a Precaution I have done that with all the bikes I have bought.As usual its in my mind being my age that I am going to keep them so all is new they will out live me.No sad shit intended but once done doubt you will ever do it again unless you do a crap rebuild.Sorry to be a bit morbid but thats my view
All the best
Bitsa

Trigger:
Drew, if the tensioner is working. You only need to change the blades if worn.

Lobo:
Hi Drew,

I gave my engine over to an engine rebuilder (Terry Ives)... along with a big box of new DSS parts and a VERY specific instruction, "Terry, I'm a fussy bugger & won't tolerate any fudges etc... please use anything you need, and inform me anything extra (oversized pistons whatever) & I'll get them soonest"

I collected the 45000 engine a few weeks later.... with much of the box of bits back.... unused. I was disappointed (initially) - but Terry was adamant that the engine was beautiful within, "& only just run in" (I'm not saying it hadn't had a complete overhaul by some PO) He didn't see any point in throwing out perfectly serviceable / in tolerance parts for new. And when all's said and done... MY bike will only be riden a few 00 miles a years .... I'll likely never wear it out.

POINT is.... these Honda OEM parts can cost a fortune, and if like me, you'll not be using the bike as a daily commute etc... don't unnecessarily waste cash. The manuals state tolerances everywhere, there is this great site ... by all means the primary chain & cushs, camshaft chain / bits (peace of mind)... but the rest???

Oh... & my engine sounds beautiful... with its new clutch cushs!

Bryanj:
As long as the horshoe pivots freely and the plunger is free in the casing I would only replace the springs on the plunger as they were only just strong enough when new.

Check the blade for cracking where it bends at the ends and the cushion for rubber loss replace either if faults fond---The tensioner blade can be replaced with just a cam cover off but the cushion needs the head off and barells lifted

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