the last event this season

Last weekend was already the last event for this year, Giessen, for me the first time here and I like the track a lot. So hopefully we can ride here again next year.

We took a lot of bikes with us, left to right:
-the C110 racer for the oldtimer class.
-CB50 racebike we overhauled for someone to do a couple of test laps in the oldtimer class, luckaly it behaved all good so I could jump on my C110 after 2 laps en do the rest of training with that.
-My dad's old CB50 racer that we had a friend ride in the 50 class.
-My own CB50 that didn't run very well in this experimental phase, took a little getting used to again to rev between 12.500 and 14.500.
-and last but not least, my RSC90, reliable and quick, might just open up the engine this winter to see why it is as quick as this, because I can't really believe how it's doing so well.

picture day

Not bikes this time, but parts.
homemade cast aluminium parts.

Honda CR750 pedals


Honda RS125 / RS250 foot pegs


Honda CR110 pedals and pegs


Honda MT125R top yoke


Honda replica brake plate for 160mm drum


Honda CR110 / CR93 perches

(in machining all evidence of mirror mounts will be removed, better then plugging one up or welding it shut)

JRP covers for sale, part two.

the top engine covers / breather kits are also ready now
for sale as a set with the points cover or separate.



interested?
cb-viguur@hotmail.com

only 10 to 12 breather sets will be made

JRP covers for sale

I've now got 5 JRP points covers for 6v monkeybikes machined and ready, but I don't have that much engins myself, so some are for sale, if anybody is interested, give me an email.



I'm also working on the top cylinder head covers / breatherkit, but they are not ready yet. Will be available soon, and also as a set with the points cover.

2 more days of aluminium casting

Last week, I planned two days of casting and managed to create some more nice parts



some Honda MT125R top yokes, CR750 pedals and shift arms, CR110 pedals and pegs, also useful for other Honda racers like RC162, RC181, CR450, CR72 replicas and so on.

Another 160mm TLS front brake plate and a bunch of JRP engine covers for monkey engines, most of which are already reserved for friends.
Guess I'll have to do some more casting...

after Den Helder

Den Helder went pretty well, the RSC90 ran like a top but once back in the workshop I discovered the cilinder base gasket is leaking some oil, so sadly I will have to open up the engine.


picture from the CRT website
Note the 4LS front brake is back in there and this time it worked.


The longer brake lever on the C110 front hub didn't do what I hoped it would, still pretty much no front brakes and they became really hot, so I decided on making some cooling holes in the hub.



Angled so the rotation of the wheel will create a vacuum to draw out the hot air.


Maybe I want to create some sort of small air scoop on the brake plate just above the lever, but I'll have to put the wheel back in the bike to see if that wouldn't look horrible, and this is now how the bike stands:


Rear brake was terrible also, so swapped some brakeshoes and having everything skimmed to fit again.

On the bench also a bigger front hub, replica CR110 built to match the forks in the past, but I want to try and keep the original C110 hub, it looks nicer.

tachometer

Okay, last weekend was another event, and again I forgot to take pictures, the day is pretty full when riding 3 classes and doing repairs in between.

The RSC90 had a brake problem in training, so I swapped the 4LS wheel for the spare 2LS with homebuilt brakeplate, which performed perfectly.


(picture from the CRT website)

The C110 did really well, only the brakes leave a little to be desired, might be they are too small, or that I can't get enough force into them, so I swapped the brake lever for a longer one to see if that will help for next weekend.

And then there was the CB50, took a little getting used to, as it revs much higher then the other bikes, and now found it annoying that the tachometer wasn't accurate anymore since I had fallen some time ago where the tach had some damage afterwards.
So finally I decided on making another tachometer that would be accurate even in those high revs. and the old one from the 50 went onto a CB72 where it is no problem if the accuracy goes down above 13.000rpm.

Step one, take a standard Honda tachometer and open it up.
Step two, make a little bracket that stops the needle at 3, or whatever you make your custom face start at.


Step three, replace the face, and paint up all the outside bits to the colour of your choosing. In my case black, like the original CR110 tachometers where my face is modelled after.


Step four, put the tachometer back together again, seen here still resting in the cilinder liner that has been modified to become a tach-pressing-tool to crimp the original ring closed again.


and in between, check if it still works okay, these things are delicate, I'm glad this one went well, and also like the completely white needle and black surrounds, the first ones I did were different, but I like this better. Less fuss, more pure racing use.

and another day of casting

I'ts been a long time ago, so I made some mistakes, but most of this casting session worked out pretty well.



MT125R top yoke, JRP engine covers, CR110 pegs and some CB500f carb covers in CR look.

spare wheel

The spare wheel is pretty much done, just a screen to make in front of the scoop, tested it in my SS50 motorcycle and everything seems to work just as it should.
Testfitted to the RSC90 and the brake anchor fits as it should to both the S90 and CY50 forks that I have in these two bikes.



not a bad look either, but as it only a 2LS, there will be torsion in the forks, which I don't want.

New front brake for the RSC90

With the S90 forks I've had the issue that under braking, the forks twist with the single sided brake. It's not a big problem, but it just doesn't feel that confident.
So what I wanted to do about that, was to create a double sided drum brake. As a test for that I started the homemade 160mm single sided brakeplate to see if a homemade brake could be up to my standards as for rigidity of the plate and so on.

But then I found something online in Japan: an original CB125RSC front brake

It took some time and effort to get it over here, with thanks to the great service of Masato But I got it, a real original NOS Honda 4LS front brake. Dreams come true.

This would become my new brake for the RSC90, a fork brace would have been a lot cheaper to stiffen up the forks but no way as cool as this.
So I started on making all the other little things needed to fit the hub, like the cable splitter:


machined it from billet aluminium, from pictures of the original CB125RSC and RC166 splitters, I just kept it a little bit smaller to match the tiny build of the S90.

I had spokes made to fit my 18x1,50 DID rim so the hub could be laced up.

ah look how beautifully tiny the hub is, only a 130mm but 4LS, making it cute and tough at the same time.

Making brake anchors out of aircraft grade aluminium


And as always, the last step is to make the cables, made from 2 original grey ss50 brake cables that were discoloured just a bit so they match the other cables.


and the endresult, including my newly built bigbore stroker motor: