Tue, 04 May 1999 03:54:06 PDT - Message No. 5629
From: "Michael Janko"

Subject: Re: Chain Shaft


Hi guys,

67tkm, RD04, 91.....

sounds like mine - with the identical problem. Not all of the teeth on the 
shaft are really gone and not all over but I think the only reason why is, 
that I checked it early enough. Cause of the costs of a repair (dismount 
whole motor incl. new shaft ~ 800 Euro) I refused to do this till now. With 
the teeth left on the shaft I put a new sprocket? (Ritzel) on it and fixed 
it with two little plates (Unterlegscheiben) under the screws of the unit, 
that fixes the sprocket (Sicherungszahnring) This way the sprocket is fixed 
better and it works on my @ since 6tkm without getting the teeth of the 
shaft ruined furthermore.

Now to the point what causes the problem. The genuine Honda sprocket is so 
wide at the basis that fits on the shaft, that the teeth of the shaft are 
covered on full length. Most sprockets from Polo, Gericke, louis, DID .... 
are not so wide - they fit only on part of the teeth of the shaft. And they 
are of a softer material. So the power that has to be transmitted starts 
eating up first the teeth of the sprocket and then the shaft. Especially if 
you don't grease the teeth when installing the sprocket! Metal moving on 
metal.... don't have to talk further!

So prevention: Use ONLY the genuine Honda sprocket - it cost twice the price 
( ~29 Euro) of another second party sprocket - but it helps you saving lots 
of money!!! Check sprocket every 10tkm and grease the teeth of the shaft - 
it's also worth it and no big deal! As soon as you hear strange sounds 
(Mahlgeräusche) from your sprocket check it!!! I refused to do so for about 
3tkm and the damage was done. If your motor is not the newest (like mine) 
the damage is done and you don't want to change the shaft or buy a new-used 
motor there is another solution. Get a new sprocket and fix it to the 
(damaged) shaft buy welding it on (shaft has to be changed anyway sometimes) 
to the shaft. If it's done correctly, this will give you another 20tkm and 
time to earn and save money for a  repair or new motor :-)))

If you need more details - let me know.

Micha @414



>So the question is what caused this kind of damage? chain tension not
>low enough?
>
>Any ideas to prevent that damage?
>
>Rgs
>	Hajo


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