Wheelbuilding

From the cancelled CR110 replica project I had some 18" alloy rims left over, so I decided to use them on the C110.
Found a set of original S90 spokes, old style spoke pattern, crossed over 6 (instead of the normal 2 or 4)



And this is what a wheel looks like when it's done.

Bridgestone AC01 racing tyre, will probably wear out pretty quickly with roaduse, but I do like skinny tires and there is no other option which looks and performes good.
The wheels look a bit flashy now, compare to the rest of the bike which is a little rusty and dirty, but soon it will be taken appart for painting.

Giuliari Knoscher

My beemer got a new seat, an original Giuliari.
It's a lot shorter and narrower then the imitation I had on there before.
I like it, it looks a lot sportier.
And even though it is used, all the markings are still clear, just a little cut at one edge and I will need to make a bracket to mount it, as it has gotten lost over time.



Other modification; knoscher rear sets.
Really like the ride now, you can really stear with your feet by applying pressure to one of the pegs. think this is because they are really near to the swingarm pivot.



All the ingredients for a caferacer a comming together.

C110 br(e)aking

It has been a while since the last blog, but that doesn't mean I didn't do anything.

The C110 has had its front brake stay replaced.
The balljoint system worked...until I really hit the brakes and the tab on the forks bent, causing the balljoint to end up between the spokes.



So I searched if I could find some bearings the size of the original silentblocks, but nothing really had the right dimensions. Luckaly my dad had some free time to spend behind the lathe and he created some teflon and stainless bushings.



This ads a lot of braking power, because non is consumed anymore for warping the silentblocks

new project

As if I didn't have enough projects, I started a new one, just to use some of the parts I have gathered over the years for the cancelled CR110 replica project.

It will be an 85cc racer for the SAM 50cc class (4strokes are allowed to have 85cc)

first time outside, the lengtened swingarm was just ready, made from a CL90 swingarm, now with needlebearings. Long wheelbase like the Van Veen kreidlers back in those days.


I plan on keeping it pretty simple, mostly using parts I have.
Also, the project is for sale, would somebody want to buy it and finish it themselves. That would give me more time for other projects.

CB50 caferacer

A bike I built, rode and then sold. Sometimes I miss it, it rode really nice, pretty comfortable, quick and it looked pretty cool.
Very retro 80's caferacer with magnesium wheels that just about everybody in the dutch 4-stroke community hated. I think they were just accustomed to the spoked wheels of the SS50's.

this is pretty much how I bought it and rode it for a while, the only modification by me were the sporty handlebars. It came with the giuliari seat.


Starting the transformation, this is a picture of one of the first complete mock-up's
When I bought the bike, it came with a lot of extra parts, including the tank with Bultaco stickers, I originally planned on riding it like this, just to piss people off with my "bultaco"


And the endresult, I changed the exhaust endcan later on, so the bike could breathe better, but I have no nice pictures of that.



some specs:
-ktm magnesium wheels
-CB750k1/6 front brake caliper and master
-50cc (still a legal moped)
-5speed xr80 gearbox
-CB50F camshaft
-16mm kei-hin carb
-slightly ported head and rounded valves
-adjustable clipons
-Ducati seat
-homebuilt rearsets with 10mm spanner as shifterpedal

C110 racing cam

How can you get more power out of a C110 engine? Fit it with a racing camshaft.
Only one problem, racing cams are not really available anymore.
I've seen some adds of old american aftermarket suppliers that had cams for Honda's including the 50/55cc OHV engines, but have never run across these camshafts for sale anywhere.
Luckaly my dad has some experience in making his own camshafts.

The C110 camshaft in line with a BMW R50S camshaft that will provide the profile.


Grinding stone, grinding away the C110 camshaft, this will result in a smaller ground cirkel, but also a higher lift and longer duration.


Finished product, the intake cam is reground, looks small next to the original exhaust cam, but because the groundcirkel is smaller, it is actually an inprovement.
Already made a testrun and you can feel the extra power in the higher revs without losing a lot lowdown.


C110 cam lift profile (not valve lift) compared to some others, the intake cam is now reground to the profile marked 50s,69s, clearly visible that it improves lift and duration.

S90 oilcooler hookup

The 100cc motor I've been runnning this season has the tendency to overheat after a few laps, So even though I like the empty looks of the frame, I will be fitting an oilcooler for next season.
To look at the options, I started drilling into an original headcover, it had a broken fin anyway, so nothing was lost.
But it turned out pretty well, I have my oilcooler hookup now.

The top oil line runs up because that was where the broken fin was.

I think the new motor wil really like this, as it has a topend based on the ATC110 with cast steel cilinder, something I want to put together over the winter, you can see what it will look like mounted on the empty motor here:

this will become a 122cc motor with CT110 crank and 56mm piston.

What's wrong??

The other day I just felt like taking some pictures.
I'm not satisfied with the way my SS50 looks now, something about the totall package that just doesn't feel right, but I can't really put my finger on it.
The line of the tank and seat isn't straight enough, or the swingarm is too short, front forks too long.....
Or should I just put original handlebars back on?

long time no blog......again

Been busy at work and with a lot of different stuff.
My car needed some work, but now I've got brakes again, quite a nice "luxury"

Also took an old CB72 front wheel out of the corner, that before I bought it, had been laying in a field for 40 years.
Skimmed the drum surface just a bit, to hear if any rust had come between the lining and the castwork, but it still sounded good.
Japanese hubs don't have the problems that european sh!t have, but the rustpits in the brakesurface are so deep that a lot of material will need to be taken out, so only for use in a 50cc or 125cc bike. In a CB72 we overcook these hubs anyway.
Narrowed the hub to get rid of some broken edges, but it still needs finishing.



Will probably lace it to an 18" wm00 rim for use in ....... or sell it if somebody is interested.

On the left in the picture a CB750k1-6 carb, 28mm, now prepared for a 1cylinder bike, so I might use it on a 125cc SS50 engine I'd like to build.
Also completed a 26mm Cb77 carb for use on an SS50, just out of view as it is now on the 70cc engine in the background that I might convert to 85cc.
Just some other stuff I've been working on.

bigbore stroker stuff

I've changed my plans.
I have an SS50 motorcycle (2 actually, but the second one isn't ready yet) and I collected a lot of original 50cc 5speed parts for them, like alloy cilinders and the heads with big fins and ports.
But now I've ridden with a 50cc and a 70cc engine on public roads and I just can't keep up with modern traffic. So I've fallen off my beliefs and started with the bigbore stuff. But still not the kitakkiewakkie-craft, just cheap aftermarket stuff.

I've now built a 110cc SS50 engine using a 52mm stroker crank and a 52mm piston.


specs:
- 52x52 110cc
- Old Type 70cc head with big fins (NOS), ported
- C70 camshaft
- advancing flywheel, 6V ignition
- 2plate clutch with alloy centre
- 5speed gearbox with modified first gear
- 20mm carb (until its broken in, then I might go bigger)


Today I built this engine under my SS50 motorcycle and took it for a testrun.
Nice torque, lots of power, in fact, more than the clutch can handle.
So at the end of the day I took the motor out again, will need stiffer clutch springs and also need to look at a small issue with the gearbox.
But this promises much good things, I allready have plans for a 125cc 54x54 engine.

And another crazy idea, a very much cc old style C90 with the 6V engine.
My S90 has shown these old things can be quick, now I'd like to use one of these old beasts to kick the crap out of some of those modern chinese 125cc+ bikes.
With the parts Ralph has, we could get upto 180cc, or just 170cc with the cranck he would sell to me. but still that is more then the china-crap.
Now just to find a C90 to start the project...... if someone in holland has something, you could let me know.

crappy sketch:


I won't be actively pursuing this project, as I still have a couple of other ones that are unfinished, but this would be a fun quick one.