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alternator chain too tight

Old 04-16-2019, 08:53 AM
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Default alternator chain too tight

my CBR 1000F 1988 developed the symptoms of a failed alternator/starter chain tensioner. It made a sound like chain going over cogs when the starter button was pressed.
I thought I would have a go at the fix posted by Henry M.
When I got the alternator off, the chain looked slack. I levered the tensioner gently in the tightening direction and it made 2 or 3 clicks an stayed there, now the chain is too tight to replace the alternator shaft !!
Does anyone know a way of releasing the alternator chain tensioner ratchet ?
Old 04-16-2019, 09:11 AM
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Old 04-17-2019, 01:50 AM
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Thanks CaBaRet,
I sorry I did not search the forum very well ,I can now see this a regular fault with this model (I have usually restored SOHC Honda's from the seventies).
I noted in Tentacleslap engine rebuild , he installed I shim and 1 spacer as he installed the alternator shaft, I appear to have the same on my machine, however, in the CMSL parts diagram, there are 2 more washers listed ( part 8).
I am concerned that I have dropped these down the engine!!!
Can you reassure me that the shim and spacer are the only items on the after the damper , and before the clutch.
I appear to have eliminated the alternator chain tensioner as my fault. Therefore the clutch or damper is the culprit. There was a noise sounding like a chain going over cogs, this could be the clutch riding over the humps , can the clutch be dismantled and repaired? What can be done with the damper if it is faulty?
Many thanks _ This forum is magnificent, I hope to be able to contribute in due course.
Old 04-17-2019, 02:07 AM
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Hi , not knowing these bikes too well , the 2 washers your talking about are spring washers, I'm sure I read on here somewhere about not needing them, but could be wrong,so they might have not been there in the first place, Tentecleslap and Timbuc2 are your gurus on here,and as your in the uk try Fowlers they are good for parts Wemoto too, Starter Clutch maybe page 11-15 of the manual

Last edited by CaBaRet; 04-17-2019 at 02:10 AM.
Old 04-20-2019, 01:04 PM
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The extra washers that the diagram shows are located behind a snap-ring inside of the spacer that sits between the large gear and smaller driven gear that the drive chain runs on. i suppose repairing the clutch might be possible, you can definitely tear it down further than the diagram suggests but unless you can correct the problem with the parts that live inside you're probably looking at buying a replacement anyhow.
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