MT125R top yoke, JRP engine covers, CR110 pegs and some CB500f carb covers in CR look.
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.
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.
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:
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
Brakeplate
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
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.
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
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.
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.
Monday, June 2, 2014
close ratio gearbox, finally complete
My RSC90 is also on the workbench again, hopefully to have it up and running for next weekend in Varsseveld.
The last time I rode it, there were two things that bothered me:
- the footpegs / groundclearance
- the gearbox
As seen before the footpegs had already been changed, but the gearbox was still an issue.
It had problems shifting from first to second gear, ending up somewhere in between, halfway in neutral but totally stuck until you would kick it up and down a few times and finally end up in second.
And besides that, the gearbox had been changed into a close ratio box, except for first, what meant I had a huge gap between first and second.
So now, I opened up the motor, to finally have first gear altered to achieve a full 4-speed close ratio gearbox as near as I could get it to the original RSC90 gear ratios. While in the meantime altering the shift forks hopefully getting a smooth transition from first to second.
I had already found some gears that could become a first gear in the S90 after grafting them onto S90 parts and my dad made it a reality.
My gearbox now has an SS50 second gear made into an S90 first.
Together with the SS50 3rd/RSC90 2nd as a second gear,
original S90 3rd
and CT200 4th gear
it makes the following close ratio gearbox:
1: 17/31
2: 20/27
3: 22/24
4: 24/23
compared to original S90:
1: 13/33
2: 19/29
3: 22/24
4: 25/22
and original RSC90:
1: 18/30
2: 21/27
3: 22/24
4: 24/23
clearly visible, the difference between the stock 1st gear on top and the diameter of the modified shaft.
Also swapped the crank for a different one, because this motor had terrible vibrations, maybe this could be the solution.
Now to finish the motor and get it back in the frame and I'll have to check everything as a lot of parts had been taken out or used for other bikes in the meantime.
The last time I rode it, there were two things that bothered me:
- the footpegs / groundclearance
- the gearbox
As seen before the footpegs had already been changed, but the gearbox was still an issue.
It had problems shifting from first to second gear, ending up somewhere in between, halfway in neutral but totally stuck until you would kick it up and down a few times and finally end up in second.
And besides that, the gearbox had been changed into a close ratio box, except for first, what meant I had a huge gap between first and second.
So now, I opened up the motor, to finally have first gear altered to achieve a full 4-speed close ratio gearbox as near as I could get it to the original RSC90 gear ratios. While in the meantime altering the shift forks hopefully getting a smooth transition from first to second.
I had already found some gears that could become a first gear in the S90 after grafting them onto S90 parts and my dad made it a reality.
My gearbox now has an SS50 second gear made into an S90 first.
Together with the SS50 3rd/RSC90 2nd as a second gear,
original S90 3rd
and CT200 4th gear
it makes the following close ratio gearbox:
1: 17/31
2: 20/27
3: 22/24
4: 24/23
compared to original S90:
1: 13/33
2: 19/29
3: 22/24
4: 25/22
and original RSC90:
1: 18/30
2: 21/27
3: 22/24
4: 24/23
clearly visible, the difference between the stock 1st gear on top and the diameter of the modified shaft.
Also swapped the crank for a different one, because this motor had terrible vibrations, maybe this could be the solution.
Now to finish the motor and get it back in the frame and I'll have to check everything as a lot of parts had been taken out or used for other bikes in the meantime.
C110 racer in action
Look at what I just found online, pictures from my first event with the C110.
I didn't really look for anything because the bike sadly broke down at the end of training, but apparently somebody had the camera out early.
pictures thanks to the CRT website
The bike is now out to have the seat covered and in the meantime I'm rebuilding the topend of the motor to solve what caused it to break down. Yesterday I had it put back together again only to pull out the threads on the last bolt, causing me to get the cylinder head back off again to fix it. A job for today, together with getting the RSC90 back up and running again, because next event would be nice to ride that bike also.
I didn't really look for anything because the bike sadly broke down at the end of training, but apparently somebody had the camera out early.
pictures thanks to the CRT website
The bike is now out to have the seat covered and in the meantime I'm rebuilding the topend of the motor to solve what caused it to break down. Yesterday I had it put back together again only to pull out the threads on the last bolt, causing me to get the cylinder head back off again to fix it. A job for today, together with getting the RSC90 back up and running again, because next event would be nice to ride that bike also.
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