RE: Starting trouble - Bad starter? (Full Version)

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RE: Starting trouble - Bad starter?

  

druncle -> RE: Starting trouble - Bad starter? (5/13/2008 7:52:08 AM)

Interesting stuff Kaska, and perfect timing!!
Ive just rebuilt my engine for this very purpose; I examined the damper and clutch.. looked okay, but on reassembling the bike, the dreaded problem has come back to haunt me.. SHIT!!   anyway, your post is very timely; Im sure that it must be my damper spinning under starting load. Question is... hasn't the alternator chain got an automatic tensioner on it?
This being the case, on removing the starter clutch etc, isn't that chain going to tension itself up and make reassembly impossible??? I was thinking of dropping the sump to improve access, but would rather not if you have a way around this!
dry roads
    druncle

  
kaska -> RE: Starting trouble - Bad starter? (5/13/2008 8:57:11 AM)

Yes It has a self timing tensioner, but unless mine was broken it woun't do you any harm.
I removed the chain using just knife and reassambled it again using only a knife and my ten fingers of course:)

If you have problem starting the engine - the starter doing this wynie sound then probably it is the damper. You can also chek it by removing the cylinder head cover and run the starter - if the engine is not turning correctly then i am pretty sure that the damper is the problem.

Or you can just took out the damper and open it to see if the plates have wearing marks and also you can measure the friction plates  ( my plates was 1,77 -1,80  and i reassambled only the thickest ones).
There are i think 7 friction plates and 6 metal + one thick metal plate.
If you dont want to buy a new one and you have no place to get "new" one also, cou can also just clean the plates correctly and mix they positions - so they get new plate do scrach with.
And most important when you are assembling the damper dont forget to COVER ALL THE PLATES WITH ENGINE OIL! Just a slightly with finger, its enough:)

And doing so you probably gain some improvement - its not new after that but probably will postpone buying new damper.





druncle -> RE: Starting trouble - Bad starter? (5/22/2008 10:40:37 AM)

As an addition......one problem with replacing the damper/ starter clutch is that tension on the alternator chain will inevitably be reduced as the alt shaft is withdrawn. CBR1000f's have a spring loaded tensioner on this chain, and guess what....if it is working properly, youll find that when reassembling, the chain is now too tight to get the shaft back in place properly. ( there is a lot of useful help on this forum, and also a lot of advice which can be time wasting and expensive if followed, I imagine because the authors dont know what theyre talking about...BEWARE!!- ive been there; especially on this very topic!)sooo..
You can do this job with engine in frame-
take off carbs/ airbox/ starter, undo alternator nut, remove alternator shaft.
Hook piece of wire round chain to stop it dropping....Dont bother lieing the bike down  (!!!???)
Theres a tang off the alt chain tensioner in the way; bend it down out the way.
The damper should now eventually come out... this is fiddly! have patience!
Have cup of tea and fag.
The tensioner will (should have) automatically have tensioned the chain... If you look at it down the alternator aperture, youll see a spring loaded plunger.. the ratchet on this needs to be disengaged... have second fag.
I got a 6" length of bicycle spoke, and found that if bent to the correct shape, it could enter the engine via the starter motor hole, and go down to where the teeth on the ratchet are. next to these teeth, you can push the spoke thro a hole, at the same time disengaging the ratchet. At this point leave the spoke in situ.
Damper replaced , chain put over it, tang bent back, safety wire round chain removed. Alt shaft & alternator replaced.
Now the magic bit!!  the bicycle spoke can be withdrawn thro the starter hole, allowing the tensioner to do its job again. Reassemble everything else.
Have crate of Newky Brown.
This is the result of a very long day yesterday, when I tried to do the job as advised, and found that there was no way to do it, if the tensioner was working!!! Maybe some cbr1000s dont have this tensioner, but I have my doubts!
Its not a difficult job but it is a bit fiddly. Take your time, dont start hitting things with hammers, and itll be ok.
If anyone has any pics of the tensioner; I'd have found them very useful, and so would anyone else doing the job.
Have Fun, John.

  

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