Saturday, November 15, 2014


Since I've built a new tacho for my 50 this year I got annoyed by the quality of the old prints for the tacho face. So I asked a friend who is good with graphics and has his own company in printing if he could help with new tacho faces, not only the CR110 / CR93 replica, but also an RSC and two different smiths faces, like the ATRC tacho's.
Today I mounted the first test print into an old housing to see what it would look like and how it would fit. Just a few tweaks and then it will be ready for a small production run.

also available will be:
smiths from 1 to 14
RSC from 3 to 15
CR110 CR93 replica 3 to 16

all to fit in original honda 1:7 tacho's as used on most models up to 500cc

Monday, November 10, 2014

another batch

And yet another batch of brand new vintage parts.
Including two of the newest project, a rear backing plate for 110mm Honda hubs, SLS but also in the future I plan on making a 2LS out of it, some preparations for that are already in the mold.
Planning the 2LS for my RSC90, will make the rear hub fit more with the 4LS front CB125RSC hub.

the line-up:
160mm front brake plate, Honda RC styled
110mm rear brake plate, Honda RC styled
CR110 footpegs
CR750 clutch perch
Honda RC styled brake pedal
JRP breather covers
S-monkey oil cooler adaptors
RSC engine cover, meant for a Honda 50, but going towards a 750

Thursday, October 23, 2014

CB72 racer

Had one of my dad's CB72 racers out to testfit a CR93 fairing that I have for sale, someone wanted to know how it would fit a CB72.

Fits it quite nicely I would think.
And then we rearranged some of the workshop, what meant that another CB72 came out of a dark corner, making me want to start this project.

Not with original tank and (replica) CYB seat as seen here, but with something more like a CR72 tank, period correct and with a lot of home made castings and other replica parts, and even some originals. As I have collected some CYB72 stuff over the years.
I have, or can build many of the small parts, the tank will pretty much be the only part I really don't have any idea of where to find or how to built yet.

Thursday, October 16, 2014

S90 trial

another great project from a friend, who is building an S90 trial bike.
And I will so lucky that I get to work on some little things for this bike also.

Wednesday, October 8, 2014

end of season checks for the C110

the racing season is over now, so time to check the bikes and store them for winter.
At the last event the C110 started shifting a bit less smooth, so I wanted to open up the motor to see if I could find anything.

couldn't really find anything with the gearbox except for normal wear, well, not even normal as the bike is about 50 years old and all I could find was a small mark on a shift fork. Made some clearance there and that was it.

Then wanted to clean the clutch, as it acts somewhat as a centrifugal filter and found this:

oops, although I've seen them worse in pictures.

luckily I had a spare engine by now that still had a good clutch center, so this is going back together as it worked fine up till now with the extra preload washers with heavy duty springs.

Just one modification I wanted to do to the gearbox, I replaced the standard stopper arm with an S90 part, these have a little roller on the end, that might just prevent the selector to stick between gears. I've had this happen a couple of times so hopefully this helps, or the fact that I now swapped the old style shift arm for a more modern type, eliminating about 2cm of play in my pedal.

Monday, September 29, 2014

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.

Friday, September 26, 2014

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)

Thursday, September 18, 2014

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.


only 10 to 12 breather sets will be made

Wednesday, September 17, 2014

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.

Friday, September 12, 2014

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...

Wednesday, August 27, 2014

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.

Thursday, August 21, 2014


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.

Tuesday, August 19, 2014

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.

Tuesday, August 12, 2014

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.

Monday, August 11, 2014

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:

Monday, August 4, 2014


A while ago I found a new brake for my RSC90, that I'm now in the process of fitting (pictures will follow) but the old brake has come out and I've also started machining my self cast brakeplate to fit that hub, so I can have this as a spare wheel.

Already starting to look like a real Honda racing front brake :D

Sunday, August 3, 2014

bigend trouble

During the last event at Gramsbergen, I blew up the S90, The bigend totally expired causing damage to the piston, cylinder, valves and of course the crankshaft itself.
This is what was left of the bigend bearing, the rest of the aluminium cage could be found all over the insides of the engine.

As I was running a 53mm bigbore kit, I can't just go for a different crank and an oversize piston, so I decided on getting plan B out and building me a stroker/bigbore engine as I had planned a long time ago.
Now built with an ATC110 crank and cylinder that is bored out for an ATC110 56mm bigbore piston, combined with a ported and modified C90 head to fit all S90 internals from the other engine that wouldn't fit in the ATC110 head.
Also in different cases that where bored to except the ATC110 cylinder but still with the same 4speed close ratio gearbox that I ran in the other engine.

Note the extra bolts in the right cylinder head cover, these are for the oilcooler that also has been added this season.

Tuesday, July 8, 2014

Honda C110 Racer Hondadag 2014

Hondadag 2014, Somebody was kind enough to film my C110 racebike on the dyno and put it up on youtube, enjoy the sound of a pushrod motor going up to 112km/h (70Mph) with 6,6Hp at the rear wheel.

pretty much done

Okay, it's been a while since I posted anything, been busy with lots of things and the racing season has started again, but I constantly forget to take pictures.

In the middle of it all, my road going C110 has been pretty much finished, I still want to open up the motor as I feel it is a bit noisy on the camshaft drive, but I've been riding it.
Last weekend I took it to the "caferacerdag" and for the event I mounted the exhaust of the racebike.

pictures thanks to chalopy

Friday, June 6, 2014

Two bikes running

The C110 came back from upholstry so I fitted the repaired motor and got all the cables and bits hooked up again.
So this one is pretty much ready for the CRT event in Varsseveld

In the meantime the motor for the RSC90 is all put back together again and fitted to the frame, fired it up and it looks like there is a lot less vibrations with this other crank, which I now will be running without any rotor on the crank to reduce weight.
Stole the front fender back from my SS50 motorcycle.
Gave the exhaust a fresh coat of paint to hide some big scratches.
And my dad built me a new paddock stand to go with the new foot pegs.

Just a few little bits to do, like putting my startnumber on the front.