Team!

Which one do i choose?

Engine number is SC21E2018156

Any help welcome

 

Although they are all effectively the same
28120-MM5-003 specifically relates as a
part number to the (87-88) MK1 SC21
engine.

 

Do you need a starter clutch or a starter damper ???
I ask because when my starter started to turn very slowly I bought a starter clutch when what I should have bought was a starter damper.
I have an as new starter clutch if you need one, from a 90 model.

 

Sprock - much appreciated, i will order that one then.

Shadow - yes it is disengaging when the engine goes to fire. I'm also changing the damper so hopefully one way or the other it will start. will be getting new bearing too. will post progress and maybe even purchase process.

 

Ok, so finally found the cash to buy the necessary parts.

Bought both starter clutch and the alternator damper (and the bearings)

hopefully I've ordered the right ones as the site had 4 or 5 references to both the damper and the clutch

will keep you posted!

Owen

This is the site i used

http://www.partzilla.com/

Cant make the image any bigger, trust me it was reassuringly expensive 337 inc shipping to AUS of $65

 

As mentioned elsewhere, the damper is discontinued by Honda-bugger! So now faced with disassembly, shuffling of a plates and addition of a 1-2mm washer to create more friction. There has been some thought that a MkII might fit. Any thoughts?

Parts have arrived. Three bearings and the starter clutch. The part that arrived was 28125-MS2-613

I am unconvinced that this is the part I ordered but looking it up on the Partzilla.com site shows it common across all bikes from 87 to 96.

Looking at old v new



I was initially doubtful that this is the right part but i suspect that it has simply been improved. the spline and bearing housing look identical. still in packet though. anyone done this job and found this to be the case.

So now need to disassemble the Damper and start to place the jigsaw together again!

Owen

 

G'day Owen,

I got your mail and sorry I haven't replied, that is not my work computer and rarely gets switched on these days as I've been travelling for work over the last few weeks with a work supplied notebook and tablet.

I know Shadow has rebuilt his alternator damper as did Stu in his How To. Sprocks probably done one as well as he knows every part of the CBR1000F on a first name basis

I seem to recall the plates have to go in with the 'dish' a certain way. Just think of a motorcycle clutch and the damper provides essentially the same service.

Cheers, SB

 

A very worthwhille thread to read on the subject.

Shadow - gets detailed about the "cupped" washers and reassembly.

https://cbrforum.com/forum/cbr-1000f...per-ok-117309/

and of course Owen the now infamous Stu's alternator damper reference

http://www.stu.co.nz/cbr1000fix/

Well now Seb - this is actually one I have not had to do yet - but it will be my destiny
of that I am 100% certain

 

Gents - appreciate the thoughts. Am reading the damper rebuild next!

Seb - if you do have any time to measure the MkII damper that would be awesome.

Am following Stu's thread although i like Seb's modifications. (I have a coat hanger for a spoke substitute) I am going to photo journal my own rebuild as well to hopefully add to the pool.

Either of you replaced the starter clutch and found the new one to have the smaller external diameter you see in the photo?

Day off tomorrow, so hoping to get started and maybe get the mechanic to bench press the bearing in to the housing (He's a strong lad!)

O

 

Here are the measurements Owen - for the Mark 2 CBR1000F Alternator Damper- with pictures to save a heap of trying to explain


The total length is 55mm


Length of the plate housing is 31mm


Width of the plate housing is 50mm


Inner splined end is 26.8mm


Other end near cog 29.8mm


Cog teeth of which there are 21 are 39.8 mm across

Hope this helps.

Cheers, SB