Tuesday, December 28, 2010

RSC front fender, part 3

Some more progress on the front fender, I didn't feel like it for a long time, so I did a lot of other small stuff but now it is really comming together.

I pressfitted the rods to the fender stays using 2 pieces of steel with half of a round hole cut out of both of them. The rod is now stuck in the stay and will be hold in place by some glue* when all is done.
(special glue also used for putting lining onto brakeshoes)
I bent the stays so they meet up with the fender, that is how it now holds the fender over the tire.

A view of the bike with the fender, for the bigger picture, I like it.

Next step will be to make some reinforcements to go under the fender and riveting it all together. I allready made a mold for the rivet heads by pressing a ballbearing into a piece of aluminium.

pedals part deux

part three is still to come, my pedals aren't finished yet, but they are mounted and functional, when I have a rear brake cable made.

brake pedal still needs some "teeth" so I won't slip off.

Shift lever and linkage, with a hole drilled thru the pedal, like some original RSC/RC/CR levers had.

Connecting rod had to be bent to match up to the engine, so only threaded at one side for adjusting.

some more progress on the Oudshoorn

My dad did a lot more small jobs on his BMW and I helped a little.
I had some tickle style headlamp brackets at home, that were supporting a CB72 headlight on my desk (my kind of paperweight) I fitted them to the ceriani/van bockel forks with an original BMW headlight my dad still had. It has clearly been on a caferacer before, as there are some extra holes and switches and there was only a tacho mounted, no speedo.

Also mounted the levers, they are reproductions of the old tommaselli levers, they fit well with the original tommaselli throttle that I allready found in the bottom of a drawer.

And for when it will not be ridden with a sidecar, a kickstand is fitted. Not the original as the bracket on the frame was ground down, this was made using Honda C50 kickstands and the end is off a Honda brakepedal. Mounted to a 10mm steel plate which sits between the frame and engine instead of original bushings.

Sunday, December 19, 2010

first modifications for the C110

I've done the first modifications on the C110, I don't plan on drastically changing the bike, just some different but if possible original parts.
I had a NOS C110 taillight that I bought for my SS50 motorcycle, but now I think this is a more fitting place to mount it.
I think it goes better with the round backside of the seat then the taillight that was on here.

Just need the correct screws to mount the glass, as honda used abnormal threads in the early days. This needs M3x0.6 while normal M3 has 0.5 pitch.
I didn't paint the taillight because I'm thinking of changing the color to red anyway.
For now this light is on so I can drill the holes in my licenceplate in the correct spot. It still has to be made, but the paperwork has allready arrived.
Date of admission to public roads is set at 1968, taken from the swiss paperwork, so I'm allowed to get an old blue licenceplate for the bike.
(modern bikes have to have ugly yellow plates in Holland)
This also means I had it approved as a small motorcycle, not a moped, so it's legal to bolt on some "go-faster" bits.

Sunday, December 5, 2010

My new bike

Yesterday my dad and I went to pick up a new bike.
This one has been on my wishlist for a while, and when I saw this one for sale on the internet, it looked perfect for me, complete with all the right parts.
It was a 180km ride to get it, and we were lucky that on the way there all the roads were clear, but the way home took a bit longer. The view from the passengerseat:

It is a C110 with Swiss paperwork, and because in Switserland you are not allowed to have a passenger, it had an original racing seat. (as seen on ebay for many $$$)
It is unmolested, allmost all original parts with original bolts, so a good place to start a restoration.

I'm not quite sure what I want to do to it, keep it mostly as it is, or change it to more of a CY110 with racing parts, like this bike found on a japanese blog called oldsportsrider
And for tuning purposes I've got an extra engine with the bike, so I can keep it running while building a faster engine.

I must admit, I goes a bit far to buy a bike to use some parts you allready had, but I will be mounting the original breather set on this bike that was in my closet for a long time.

Only need to make the lid for the labyrinth as I don't have that, but a friend has one that I can probably borrow to copy it.


The last week I've been working on my brake and shift pedals for the RSC90. I have footpegs that are original CYB72 as also seen in RSC90 pictures, but I don't have the pedals that belong to it, and as they are very rare, I don't think I will ever find them.
So I decided to make my own, in the same way I made them for my CB50 and SS50.
I will be making them out of alloy, original would be chromed steel, but I don't want the hassle of chroming.
For now, this is how my brakepedal turned out:

I made it narrower where it mounts to the peg-brackets so it will be easier to put the bike on the paddockstand. The cable mount is different because original CB72 cables are hard to find and/or expensive.
And I want to make a grooved pattern in the pedal itself, but I don't know how I want it to look yet. After that, there will be some more smoothing and rounding off edges to make it look like a sandcast pedal.

This was made by welding some pieces of scrap aluminium plate together and then a lot of sanding and filing.
As you can see here, what is the beginning of my shiftpedal:

Tuesday, November 23, 2010

SS50 engine troubles

Found the problem for the slipping clutch, it was weak springs, luckaly the local Honda shop sells extra strength clutch springs for a C50 clutch that will also fit the C110 unit. You only need to buy 2 sets as a C50 has only 4 springs.
When compressed to 12mm these gave 9kg's of pressure, compared to the 5kg's I had from the stoch C110 springs.
Also something was found for the gearbox problem, it turns out the old C65 casings have a higher hump inside from the footrest mounting holes. This caused my shifting arm to hit against it and not being able to give the full movement to the shiftdrum.
The piece marked in black marker was cut away and now it shifts like a dream.

RSC front fender, part 2

I've made a die to press the ends of the front fender stays.
It is milled from a piece of solid steel and made specifically for 8mm (alloy) tube to be pressed flat like Honda used to do, with a rounded edge and pressed to one side.
The first test:

You can see some irregularities and a nick from the end of the die, so I made some changes by hand, I was happy by the third test:

And the stays as they should be put together:

I want to put it all together in the weekend as I want to take my time for this. I don't want to rush it in the hour after work that I spend in the workshop.

Friday, November 19, 2010

RSC front fender

As the ss50 engine was built up again, I spent some time on my RSC project.
An aluminium front fender has been lieing on my front tyre for some while now, waiting for brackets to be made.
So I started the process. Found a piece of strong 2mm aluminium and cut out the right shape for a fender stay. It has been modelled after a C110 front fender stay although that has a thinner pressed plate example.

I chose 2mm plate for its strength, because I want it to also function as a fork stabiliser.
Something I experienced with my SS50 on the road with plastic or steel fenders, is that I do want a strong connection between the legs.
I will eventually round the edges of the stay to immitate a thinwall pressed plate stay.
The stays will be riveted to the fender and the 8mm tube will be welded to the stay after it is clamped in place by folding the tabs on the stay around the tube. Just like original fenders.
And to give you an idea of what it will look like:

I will also add a plate underneath the fender that will be riveted together with the stays, to add strength to the fender where it functions as a fork stabiliser. Something also seen in original (steel) fenders, mostly causing them to rot out from underneath.

the oldschool engine runs

And it accelerates a bit quicker then with an original clutch.
I rode it home from the workshop today, hoping I could take it for a ride tomorrow, what is probably the last dry day of this year.
But....shifting is still not the way it should be, so I will have to open it up again and sadly the C110 clutch is also slipping like crazy. Tomorrow morning I will check if I did something wrong with the adjusters, but I am afraid that it is the plates or the springs.

Sunday, November 14, 2010

valve spring retainers

The old-school SS50 engine is back together again, and it has run, but I need to make a real testride to feel if everything is allright.
But when checking the head, I found something that didn't work.
I had made triangular valve spring retainers by grinding off parts of the originals, but this resulted in one point of the retainer getting cought on the end of the valve spring, stopping it from rotating over each other.
The solution: making a 6-pointed retainer.

from left to right:
original, old adapted retainer, new adapted retainer

Method: bolt the retainer to a piece of perforated sheet metal with round holes, then spraypaint, this will mark what you need to cut away.
My scales aren't exact enough, but you take off about 2-3 grams, this matters at 12.000RPM.

Wednesday, November 10, 2010

My new tank

My new tank came in a few days ago, thanks very much to Matt Hummel
Trying it on my bike, to see if it clears the master cilinder, as the toaster tank I am currently using didn't and had to be slightly altered on the bottom to fit.
But this tank clears everything perfectly, probably made for the dual disc setup.
Insides are perfect, outside does have some rust as a previous owner started blasting it, but never finished.
I will have it painted black with white pinstripes, luckaly there is enough of the original stripes left to have them copied.

progress on the Oudshoorn

there is some more progress on the Oudshoorn BMW.
My dad is busy fitting the cilinders, heads and pistons so it will al work together, not to easy considdering everything comes from different models.
- 700LS heads and pistons (car)
- /5 cilinders adapted to fit an R50 case that has been modified for long studs that run all the way up to the rockers.
- R60/2 cranck
- .......

old school altered front brake plate, only it should be in the original leading link front end, there will be an original front brake plate to go in these van Bockel (ceriani) forks.

Monday, November 8, 2010

more new parts on the oldschool engine

New crankcase for the "old school engine"
well, not exactly new, it comes from a used C65 motor. I wanted these because of the mounts underneath the cilinder for a guard plate. At some point an oilcooler will be mounted on here.
After glassbead blasting:

Nice that there is no engine number, the old engine must have had the cases swapped at some point.
BUT.....these are 1960's cases, this means problems like I've encountered with the S90 motor, but didn't expect on this.
different locations for the guide pins, should both be be on the top tappets in this picture, but they are not, so I can use only one that corresponds with my cilinder.

A hole, my piston for the camchaintensioner will not block this and won't be able to build up pressure, will have to find/make a longer piston.

The piston I had in the other cases, with the long spring. And the short spring that was with the C65 cases, this tells me I need a longer piston.

new clutch for the ss50 engine

I have been collecting parts for my "old school tuning" ss50 engine, to replace the original clutch with one from a C110.
The C110 has an aluminium center that weighs a lot less then the original ss50 clutch. Although my engine had a 2plate clutch from a chinese copy. even more weight then the original 1plate, but it was the only complete clutch I had laying around at the time.
C110 clutch:

Only it doesn't fit onto an SS50 crankshaft without modification, so I had my dad grind the inner diameter to fit the SS50 crank, then the splines fit.

On all sides it needed some work, the primairy sprocket needed some work to fit onto the gearbox main shaft. Some spacers needed to fit the whole clutch onto the crank, and a bearing holder had to be fabricated to let oil thru, as the c110 doesn't have that.

To give an idea about the weight loss
2 plate:

C110 clutch:

Now to finish the engine so I can hear the difference in revving, I'm looking forward to starting this up and hearing the difference.

A nice bonus is the difference in primairy reduction.
SS50 originally has 16:69.
my 2plate system had a 17:67 reduction.
And the C110 has 15:70. this means the gearbox will make less revs, letting it shift easier.

90 valves

The valves for the 90 have been done.
Thinned down the shaft for the length it sticks into the port with full lift on the cam.
This means more space for fuel to get thru and a reduction in weight, this will help in the higher revs.
Also they have been ground into the seats to see where the contact is, and the edges sticking out have been removed and rounded to let fuel pass by the valve easier.

Also removed weight from the side of the valve that is in the combustion chamber, the loss in compression is minnimal, but you will notice the reduction in weight.

Sharp edges removed from the combution chamber.
Now only to wait for my titanium valve spring retainers to come in and then the engine can be completed.

Sunday, October 24, 2010

we're back

I've had a slight computer problem, but I'm back online now.

In the meantime I've recieved some nice packages in the post.
12" sidecar wheel I just couldn't let it pass me by.
Seen here next to the 16"front wheel of my dad's sidecar racer

You don't have much opportunities to get these, and it might look great on my dad's Oudshoorn BMW.

Also bought some nice carbs on ebay for my own BMW, because I'd like to determine the position of the throttle slide instead of it being "automatic" like in the original carbs.
These are 36mm BING off an R75/5.
But I will have to alter my footrests first or my foot will get jammed between the shifter pedal and the lower part of the float bowl.
This will be a winter project.

Today I checked the oil levels of the driveshaft, gearbox and final drive, because I had some leaks. Might be a seal put in backwards by a previous owner, this will be checked in winter, for now the levels are correct again.
But when working on the back, the broken rear fender began to really bother me.
The mudflap covered the damage, but I wanted to get rid of the flap because it made my bike look like an old geesers machine.
So I took the grinder and reworked the rear end.

Looking a lot more sporty now. I want to do more to it, but for that I would need to take out the fender, not something I want to do when I need to take the bike home again, or rather, it had to take me home again.

Saturday, October 2, 2010

screw-ons mounted

Today I mounted the new screw-ons.
here you can see a new one mounted and an old one still on the right (of the picture)

A lot of difference in the height and the angle, on my way home I allready found it a lot more comfortable.

Original throttle controls:

Drivers view:

Because I have a twin leading front brake off a CB125k1-5 my front brake cable has an 8mm ferrule, where an SS50 only has a 7mm ferrule. This was never a problem because I used CB-type levers and switches, but now my brakecable wouln't fit into SS50 type switches so I had to machine something to match an 8mm cable to a 7mm hole.

By the way, my old set of screw-ons is now for sale.