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Gearbox sprocket

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Gearbox sprocket

Posted by Dan Field at April 13. 2018

What started as a quick oil seal change turned into something more major but Ive seen kickstarts, sprockets and gear levers welded to their shafts  but this takes the biscuit!

 

Re: Gearbox sprocket

Posted by ian_soady at April 14. 2018

Apart from being worn out, as long as it's been competently done don't see a problem? The engine sprocket on my ES2 has been welded at some time in the past and it seems OK.....

Re: Gearbox sprocket

Posted by Dan Field at April 14. 2018

The whole sprocket ring was welded on to the splines and it isn't aligned properly,you can see by the side wear, let alone the weld quality, but what’s the point when sprockets are and have been available!

Re: Gearbox sprocket

Posted by patrick_mullen at Sunday 07:40

Hi Dan,

From memory this sprocket should be held on with a big left hand thread nut.  Are the threads damaged as well.

Patrick

Re: Gearbox sprocket

Posted by ian_soady at Sunday 11:03

I've seen worse.....

These bikes were just cheap transport for most of their lives and were often worth less than a proper repair would cost. That one does seem to have lasted long enough to hook the sprockets....

I'm not suggesting it should be done now but understandable in the past to keep on the road.

Re: Gearbox sprocket

Posted by richard_hudson1 at Sunday 20:26

Previously ian_soady wrote:

I've seen worse.....

These bikes were just cheap transport for most of their lives and were often worth less than a proper repair would cost. That one does seem to have lasted long enough to hook the sprockets....

I'm not suggesting it should be done now but understandable in the past to keep on the road.

If the teeth are off centre and you put it back on the other way it may line up and you can use the un-warn side of the teeth, lots of life in it yet. (just joking)

 

Re: Gearbox sprocket

Posted by Dan Field at Sunday 21:49

Andy tells me that gearbox sprockets were like hens teeth a few years ago so I guess that was the only way to keep it running, so I forgive the po, but he could have done a better job welding it!

Patrick the mainshaft threads and nut are good .... fortunately! I’m doing the chaincase seal and drive side crank seal while I’m in there.

Cheers dan

Re: Gearbox sprocket

Posted by patrick_mullen at Monday 18:48

That's good news then, Dan.  I've changed the oil seal a couple of times but don't recall much about it which probably means it is pretty much a screw off/screw on job but as Uli will probably vouch for nothing is ever a simple screw off/screw on job on a    Jubilee/Navigator !!!.  Mr Honda probably keeps one in a glass display case in his office just to remind himself how superior Japanese technology ( C50 ) was.  How do you say Vorsprung durch Technik in Japanese ??.

Yes Jubilees were worth nothing or a bit less back in the seventies/ eighties and not much more now.  But we still love them - they are better than the average jigsaw puzzle (with a few bits missing).

Re: Gearbox sprocket

Posted by Dan Field at Monday 19:24

The biggest challenge was getting the new seal in, the original was encased in metal, the new one is rubber and the edge of the casing is sharp, ideally it needs easing but I didn’t want Aluminium filings in the mainshaft bearing!

Oh and I had to drill one of the chain case screws which even an impact driver couldn’t shift, that needs a nut welding on the remaining stub.

so yes, nothing is quite straightforward !!

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