Any info on this double sprocket? Was it a factory option or did someone make it?

Any info on this tank colour? Every tlr I've seen had a white stripe through it. 

I need new shocks is 400mm the best size to go with?

Cheers

 It appears you are not in the UK? Markets varied world wide.

I am in Australia, bike was imported from Japan I believe an 83.

Will the chain run on the smaller sprocket ? It looks to be more of a spacer or adaptor.

It would give a massive rise in gearing, would the bike even be able to pull it ?

I would be surprised if that was factory supplied.

Some works bikes tried double sprockets on the rear to enable higher road speeds between sections, mainly for ISDT and time keeping. But this Honda by the looks of it has no way of tensioning the chain when its slipped to thesmaller sprocket. There is of course the issue of alignment between chain and gearbox sprocket, unless this was able to slide across on the output shaft to compensate. Some pictures of the gearbox side would help. As this bike has a helmet lock fitted on the top rear frame loop it looks as though this is an Aussie spec. machine and the taller gearing option is there for distance travelling. Would really like to see the drive side of the bike. There was on some bikes a pull out twist and lock device which altered or engaged another gearbox drive sprocket, but I doubt that this Honda has that.

Edited December 14, 20187 yr by section swept

Long after people had stopped riding such things there, Paul Jackson (if I remember the name corrrectly) rode a rather special C15 in the SSDT.  It had two rear sprockets and he removed links for the roadwork.  A bit fiddly but probably worth it for the distances involved.

@collyolly Yes I have used both and both go really great!

@sectionswept Yes no way of tensioning you have to drop a link in. But no Aussie spec, was a Jap bike and imported as a farm bike roughly 8yrs back.

I have managed to find 2 other tlrs online with this same double sprocket setup. The teeth on mine are 13,36/50.

Are you wondering why, if it works so well on your bike, why having twin rear sprockets is not more commonly seen?

@feetupfun   No, I asked::  Any info on this double sprocket? Was it a factory option or did someone make it?

Obviously a specialty setup, pointless to most.  To much effort to keep unclipping and clipping in a link in a trial for most folks.

Edited December 15, 20187 yr by mower16

Its not too much effort if the set up is for road use most of the time, then swapped for more serious off road use at the weekend. Adding or removing a short length assuming all is well shouldn’t take more than a few minutes.

Does the chain line up with either sprocket ?

10 hours ago, b40rt said:

Does the chain line up with either sprocket ?

I doubt it, unless the gearbox sprocket can move on the output shaft.

21 hours ago, section swept said:

I doubt it, unless the gearbox sprocket can move on the output shaft.

I meant one or other - or neither ?

Just seen a Honda C100 Hunter Cub on eBay with the same set up, it's in as new condition and includes a length of chain in the tool kit, you learn something everyday, no new tricks out there as this bike dates back to 1960.

13 hours ago, collyolly said:

Just seen a Honda C100 Hunter Cub on eBay with the same set up, it's in as new condition and includes a length of chain in the tool kit, you learn something everyday, no new tricks out there as this bike dates back to 1960.

Told you so!