Gear Linkage
After altering the footrests I needed a system to enable me to
change gear and I decided that it would have to use a rear set linkage
system to allow me set the length of the lever and also its location
and still retain the 1 down-5 up selection (some systems were just the
lever is altered involve reversing this set-up) which I like. I
again went to my local breakers, they know me well now, and had a root
around some of there more geriatric models and found a linkage and lever
complete from a Kawasaki KH 250. This was ideal as the lever only required
shortening a little, and the linkage consisted of a rod threaded at both
ends with clevises fitted at either end. Even better was that the threaded
rod had a right hand thread one end and a left handed one at the other,
so that by just slackening the lock nuts the rod could be turned in either
direction to lengthen or shorten the linkage, allowing the height of
the tip of the pedal to be set to the ideal position. With a gear lever
from a Morini rear-set picked up with some bits from an advert (you know
the ones, were 90% of the stuff is crap but you just have to have it
anyway) and hole bored through it I was able to connect the linkage to
it. After I welded a mounting to the right footrest I could pass a bolt
through the footrest and the gear change levers mounting and everything
fitted. So after re-assembly with a couple of nylon bushes (made by my
friend/brother in law Bruce) the whole assembly was greased, fitted and
adjusted. After some adjustments to get everything where I wanted it,
the system worked well.
The whole system was a success and
worked well for about 6-7 years. But at the start of the summer
this year I noticed I was starting to miss gears and on examination realised
that quite a fair amount of play had developed in the linkages. I decided
to strip the system and found most of the play was due to the pins in the
clevises having badly worn, well they were second hand when fitted. So I
decided to see if I could improve things. I settled on replacing the clevises
with rod-ends (often known as rose joints, although this is actually the
name of one of the main manufacturers — a bit like Hoover), which are screw
fittings with a drilled ball joint at the end. So the hole in the gear change
was filled with weld then re-drilled to take up the wear from the pins and
the lever mounting was cut from the footrest and a
better mounting
turned up by Bruce that I then welded back on. The two rod ends again one
left and one right hand threaded were mounted on the linkage then bolted
to the lever and the gear change and the whole lot attached to the footrest
and then refitted to bike. Again after adjustment the system worked much
better, it was a lot more positive in changing (no more missed gears) and
a great deal smoother. It was amazing how easy it had been to miss the wear
in the previous set-up as you just get used to something.

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