C110 close ratio 4th gear

On paper the standard C110 gearbox is pretty close, nicer then any standard OHC gearbox, but while riding I felt the step from 3rd to 4th was a bit tall, so for the racebike I was wondering if anything could be done about that easily.

I have a lot of ratio's on paper of different gearboxes, so looking at OHC models, which have the same distance shaft to shaft and a similar 4speed system I found another gearbox with a shorter 4th gear that might just work in a C110.
I had a look through my leftovers of various gearboxes and came up with an SL70 4th gear what would be my best bet.
An SS50 4th gear could also be used, but then I would have to remove more material from the 3rd gear for it to work, and I didn't want to take off too much.

Seen here the original C110 gearbox with the parts to modify taken off, and on the bottem the new 4th gear, which is too wide to fit in a C110.


To make the SL70 primary 4th gear work, I had to take off a little bit from the 3rd gear cogs so they would slot into 4th. So it went on the lathe with the anglegrinder attachment.


After that, it's time to narrow the SL70 primairy 4th gear, again, grinding it on the lathe.

Same was done the the secundairy SL70 gear, and after that a lot of cleanup to get the lathe free of all the grinding dust, including taking the chuck apart and cleaning the insides.

C110 gearbox, with close ratio 4th gear upgrade kit (in the middle) :


And a quick pic mounted in the engine.


Now I really want to finish the engine and get the rolling chassis done so far that I can feel what a difference this 4th gear makes. Theoretically it should make the step from 3rd to 4th about 40% smaller.

CR750 pedals

about a week ago I did some casting for a friend
look at the nice bunch of parts laying there
copy's of Honda CR750 brakepedal, shiftlever and small change arms for the right-foot-shifter conversion.



Still finding it funny to have all these rare parts, usually made from "unobtainium" but these I just made myself.

anyone who has RSC style footpegs that I could copy?

racing style lever perches, part two

Did some more machining to finish this little sub-project.
Turned some stainless pegs for the spring to hook behind



Drilled some holes and started polishing, one at a time, not too bright, it should match the shine of the levers. I like my aluminium to still look like polished aluminium instead of chrome.



Finished product, including specials springs, bolts, castle nuts and splitpins.



mounted to the RSC90, even though I'm planning to make different ones for this bike later on, but for now it's an upgrade. Special chrome adjuster nuts were already on the cables.


And now there done and I should get back to building the C110 racer, so I can ride it this season.

But when I do another day of casting I might just make another set of these to be machined for another bike, or anyone who is interested.

racing style lever perches

This casting "thing" is getting funny.
Copied me a set of the CL72 perches that I now have on my RSC90, but then with solid mirror mounts, so they can be removed without leaving a trace.

making the space for the lever


just enough, it fits


we're getting there, mirror mounts removed and contour shaped to look like the originals that were a bit less rounded. Then drilled the holes for the handlebar.


but still some machining to do before they will be ready for fitting.
cutting the opening in the clamp, making the hole for the adjuster, threading it and making a slot for the cable. Making the pegs that the spring hooks behind, probably from stainless, and fitting them. Making the holes for the leverbolts, 7mm on top and 6mm bottom without threads for the special bolts.
A lot of work for a couple of perches, but they will be different from all the other ones in the paddock.

fresh paint

I just recieved an e-mail from my painter, where I dropped of 2 bikes last week, that my bike is ready. and next week he will start on my dad's CB100.

And some pictures included also, I can hardly wait to pick it up and start putting it together.



Although I didn't think it would be done so quickly, so the zincplating still has to be sent out.

C(R)110 footpegs

The start is there, first part of the brackets with clamps to hold the CR110 pegs like they are mounted originally. Some self made pegs made to fit. Shift lever will bolt directly to the motor and face backwards when ready.
Now to make the bottom part of the brackets and a brake cable holder.
But I allready like the looks.

another day of casting

Today I had another casting session, and this is the result:



Some of these are for me, some are for sale.

takes a lot of time to replicate existing parts, where it should be made with a two-part mold...officially. Probably triples the amount of work, but still it is nice to look at a bunch of rare new parts that a year ago, I thought I'd never be able to find. And now i'm making them myself.

another picture day

A little while ago, I changed the rear tire on my SS50 motorcycle and took some pictures.



It now has a 120cc motor, that promisses to be very powerfull, only I haven't really got it up and running yet because of bad weather and ignition problems that should be fixed now.
Have been tinkering with the jetting on the CB750 carb, but today I found something in my local Honda moped shop that will change all that again:



Found this in a box of 2stroke carbs, an original cable operated 28mm carb, So as far as I know, this should be a rare CB750K0. Not 100% complete, but I have a lot of newer ones that I can steel some parts from. The other three weren't there sadly. But I just have to put this on my bike now, as I'm crazy about original rare Honda stuff.

exhaust mount

Got the C110 project out again, and made me an exhaust bracket.



Goal is to get it looking like a complete bike for this years admissions day, because I might want to ride it in the "oldtimer" class

Bridgestones

My new 2,25x17 bridgestone tires, just in from japan, thanks to masato
Mounted to my newly laced 17" wheels for my C110 streetbike, with 17x1.20 Morad shouldered alloy rims by Poelma.



They're not cheap, but I wanted a classic profile with good handling and in the original size. No inferior chinese rubber shaped like a tire.