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Martin125tdc |
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Martin125tdc L Plate Warrior
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Teflon-Mike |
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Teflon-Mike tl;dr
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Shaft |
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Shaft World Chat Champion
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WD Forte |
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Martin125tdc |
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Martin125tdc L Plate Warrior
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Posted: 11:33 - 22 Sep 2018 Post subject: CB125 TDC - rear disc conversion |
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thanks for your replies,
Why?
well Why not, a lot of younger riders are making conversions, and making then at home of in a garage or in their work.
I think in the modern day we're in it isn't impossible. I was in a MUTT motorcycle shop yesterday and all of their new machines which are either 125cc or 250cc have rear disc, even with ABS>
Most new 125cc are disc, whether its a Honda, YAM, KWAK, SUZI or jap / china import.
These could be considered OVER BRAKED / OVER POWERED REAR BRAKE.
I really think this would be another way of keeping our bikes alive and on the road where others can admire.
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Martin125tdc |
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Martin125tdc L Plate Warrior
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Posted: 18:02 - 22 Sep 2018 Post subject: CB125 TDC - rear disc conversion |
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could a wheel from a vf500 and a nsr125 [2003] swing arm work as an option? |
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Speedy23 |
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Speedy23 Two Stroke Sniffer
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WD Forte |
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WD Forte World Chat Champion
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Martin125tdc |
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Martin125tdc L Plate Warrior
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Fisty |
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Ste |
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Ste Not Work Safe
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redeem ouzzer |
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Shaft |
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Teflon-Mike |
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Teflon-Mike tl;dr
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Posted: 19:19 - 23 Sep 2018 Post subject: |
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Oh-Kay... well if you look in the sig-line, I admit go owning half a dozen CB125TD's. If you look in profile, you'll find links to a couple of 125TD's I have ground-up restored!
Yes, I do keep these ruddy things alive and on-the-road... as to admired?!?!? Well, yeah... I'm almost half a century ancient, so take this relatively, I DO get the odd, and they ARE normally pretty odd, even compared to how odd I must be, pigging about with clapped out 125-twins!!! But I do get the odd 'old-boy' looking at one of the Super-Dreams, telling me they dont make'em like they used to, and how they had one when they were a Learner, and usually insisting, that despite the 125 badges clearly on the side-panels, it MUST be a 250.....
No, I have NOT done rear-disc conversion... why would I even want to?
VF400... it has disc-brakes... ish! They are actually the Honda patent 'inboard' discs, in a drum. Fantastic application of technology over common sense, to make something with pretty much all the draw-backs of both drum and disc and nie on impossible to change the ruddy pads in! Totally different wheel, and it's not even the same style as the Mk3 Comstar of the Super-Dream, it has slots not holes.
VF500... has more conventional disc brakes, 'some' models also had the same style round-hole Comstar as the 125 Super-Dream.. but in anodised black, not silver.... good luck finding a VF500, let alone a pair of wheels for one.
VT250? Inboard disc & slotted Comstars. VT500... inboard discs, usually chucked away for CX500 front ends by dispatchers to whom it was easier to change half the bike than the brake pads!!!!!
You are barking up the wrong tree... no, cut that, just barking!!!!
Yes, modern bikes have discs; this does not mean that they are 'better', and even less that the bike might slow-down any better.
Modern small bikes tend to have disc-brakes for two reasons; first the construction and use regs say that they have to, second its usually 'cheaper' for manufacturer to use 'standard' disc-brake components and wheels than it is make drum-brake assemblies... they dont have them for 'better' slowing down!
Have you done CBT? Tests? Do you remember the lesson on braking? in the dry, 75% front, 25% rear 'effort', in the wet, 50/50, front-before-back in all cases.
MOST braking force comes from the front brake; which is why super-bikes and the like tend to have two pretty enormous wheel-sized brake rotors on the front.... and a single tea-cup diameter rotor on the back. You brake hard... back wheel comes off the floor... and it dont transmit braking force too well... so what brake is on it matters not a lot!
What matters is the tyres! If you have crappy tyres, they dont grip very well. If you have really good brakes, they lock the wheel real easy, result is wheel locks up and you skid, not slow.
On a 125 Superdream, the standard drum back brake is more than powerful enough for the bike, and likely most tyres you could fit to its wheels. The OE drum, is sufficient; bits to recondition/overhaul are all cheap and available of the shelf, no engineering is required, and insurance salesman dont tend to frown at the suggestion! In short, its about the 'best' back brake you could fit to one!
A-N-D in the list of things where a 125 Super-Dream might be 'improved' or 'upgraded'... the brakes? Pretty much at the very bottom of the list!
The front brake; A hydraulic 'floating' twin-piston caliper design, for its era and even today, is, if in good condition, a pretty sophisticated and very 'powerful' bit of design.
But take note; only a crunt-locks-the-front... tyres are still the most limiting factor there, and decent tyres are a far better 'upgrade' for one of these things, and or so much more than just slowing down.
Meanwhile Honda 'floating' brake calipers are notorious; the calipers have a habbit of not 'floating' on thier mount-pins. This is NOT so much a design problem as a user-error.
Hydraulic disc-brakes are 'self-adjusting', so no-one pays them any attention until the pad backings start grinding on the disc, meanwhile the calipers are all gunged up, with brake pad dust that promotes corrosion, on both pistons and float-pins, and ham-fitsted DIY pad-changes shove that gunk back into the caliper with the pistons to get new thicker pads in, and make them even more sticky and prone to sieze.
Overhaul of the caliper; new fluid, new pads, and some contentious cleaning, IF you can get away with it, if not, full and proper overhaul with new pistons and seals in both caliper AND master-cylinder, and probably a new hose, will make the brakes as good as they are ever going to be, better than most and almost certainly better than the tyres!
Moving on....
Other top jobs on these bikes, is normally the engine/carbs/exhaust. Engines usually get looked at first, cos people like to hear motorbike noises, and then worry about going round corners and or stopping and stuff... engine is almost the last thing you need look at. Again, they tend to suffer numpty DIY servicing, and the unobtanium carburettor mount-rubbers usually get spilt or torn by foilk trying to get the carbs off, usually without removing the air-boxes first. Carbs themselves are then oft cleaned to death, as they seem less scary than looking inside the engine, and stickly float valves and wampy choke links are notorious niggles. 'Problem' though is usually that the engines fcuked. They have tiny little pistons, into which the piston rings are want to 'stick' with age, and cylinder and ring 'wear' is almost imperceptible, BUT to run half well these motors like decent bores and rings.... about £120 of there abouts for a barel kit to do a top-end rebuild, little point in messing elsewhere if you dont.... change the valve stem seals that are probably crusty flakey mess, if even still there, whilst you are at it, and check that the cam-chain isn't slack as a tart's nicker elastic.
Happy you have put-put-noises... starter motor, solenoid and battery, could probably do with attention, or again, you will be moaning about Honda Regulators and faffing with carburettors, and reaching for a can of etha.....
More happy... back suspension on these goes sloppy, and a sloppy super-Dream is simply horrible. Still more sophisticated than any current 125 on the market I know of, the back-suspension uses a full rising rate, multi-linkage, and short mono-shock. New mono-shocks are around £15o if you can get one.... unsurprisingly few do.... so neither do the probably seized links get reconditioned with from flakey-memory, about £120 worth of new bloody hard to fit new bushes.... BUT, a tight back-end is a joy, and a well fettled Super-Dream, with sticky tyres will handle superbly.
So make the front as good; pretty cheap comparatively; overhaul probably only takes about £30 worth of taper-roller steering bearings, £10 worth of fork seals and £15 worth of decent fork oil... and lots of cleaning.
A-N-D you may like to wonder about doing something with the electrics, and the likely rather rotten wires and rusty bullet connectors, and the indy flasher full of water.....
The torn vinal seat? The manky paint and mis-matched side-panels? Well. POR15ing the petrol tank early on, is well worth while; tanks do tend to rot on bikes this age, and it saves a LOT of carb cleaning. But otherwise, its just pretty bits, and that costs, takes time, and makes no difference to how the bike goes, turns or stops really.. its not all 'that' important.
B-U-T..... a well fettled 125 Super-Dream, on decent tyres, can be a pure joy.... ish!
As standard.... one can hold its own against any of the contemporary 'sports' 125's, or even big-bikes! It LOOKS like a humdrum 'commuter' like a CG or YBR, which doesn't garner great expectations, but, under that conservative styling, its light, tight and got as many if not more technical 'features', like proper multi-link rising rate rear suspension, like that twin-cylinder motor, and all 'restricted' to learner-legal power limits... its just as quick... and point to point, if ANYTHING will make a difference, its the bravery/skill/stupidity of it's rider.....
So take another 'look'.... audacious mods like a rear-diac or full fairing or or or... RATHER detract from what is the thing's likely 'best' feature, which is its rather conservative, dour, 'un-sporty' by modern-standards styling..... it dont look a lot, so no-one expects a lot from one, which means when it DOES it is all the more satisfying, and if it dont.. well no-one expected much any-way!
And there is simply LOADS on one of these things to keep your fiddle-fingers occupied IF you are so inclined; most of it hauling something out of thirty odd years of basic maintenance overdraft just to make it 'standard' let alone try and make it better than standard, even less, do daft ill-considered things to it that wont make it any 'better' for it, and likely a lot worse in so many ways.
Your call.... B-U-T.... you really do seem to be barking to think it's even worth contemplating, let alone pursuing! IF just owning a CB125TD isn't proof enough you are already a long way down that road of delusion! Hey, yup, I'm nuts, I have half a dozen of these things, but I am still not quite SO nuts as to think that any of them need a disc back brake! ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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Martin125tdc L Plate Warrior
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Sister Sledge |
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Sister Sledge World Chat Champion
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Ste Not Work Safe
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Posted: 08:46 - 05 Feb 2019 Post subject: |
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Martin125tdc |
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Martin125tdc L Plate Warrior
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Teflon-Mike |
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Teflon-Mike tl;dr
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Posted: 13:11 - 05 Feb 2019 Post subject: |
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Martin125tdc |
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Old Thread Alert!
The last post was made 5 years, 74 days ago. Instead of replying here, would creating a new thread be more useful? |
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