Honda CBR 125 weight modifications,performance enhancers etc

[Arcane1729]

Which full exhaust system will give the biggest increase in bhp the CBR125 and the biggest reduction in weight?

Any other performance enhancing modifications would be appreciated, thanks.
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Kymco Super 8 (125) Honda CBR 125
A2 2017
Teflon Mike: "A man can dream... but most of them are probably best not voiced.... Folk will likely think you are just mad, sad or simply a pervert."

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[stevo as b4]

Are you in a one make race series, or is it for road use? Does it need to be legal, fast or reliable?

Seeing as your post comes across as bhp and weight reduction are equally important I'm assuming it's for track use?

Weight loss will not matter for shit on the road, there's a good argument too for ''keep it heavy: keep it reliable''

In terms of Pure power output, any pipe will have no noticeable effect on performance on its own. Your looking at barely measurable gains at best.

If you have race class rules on modifications, what are they?
If there's no rules or its a road bike, then budget allowing, fit a 170cc big bore kit to a fresh or low mileage bottom end , with a flowed head with bigger valves and a performance cam too. You'll need a way to tune the EFI fuel delivery to suit then too.

You'll spend a relative fortune doing the above including dyno set up, but will make alot more bhp and a big percentage gain, maybe 40-50% more. 40% reduction in engine life. Would be a fair trade off for that too.

[Wafer_Thin_Ham]

Probably something like Akrapovic system which gives you a dizzying 0.8 bhp.
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[secretagentmo...]

[Beehive Bedlam]

[P.]

It's already one of the quicker 4 strokes. You won't make.it much faster. Just deal with it.

[dydey90]

[andyscooter]

You weren't the twat riding round droitwich conastantly for two hours were you op
If so the bike aounds shit and you need to fuck off

Two hours of a drone going around yesterday up ring road and round again could here rhe open pipea lpoud deone all the way round
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if its spelt wrong its my fat fingers and daft auto correct on my tablet

[RhynoCZ]

Let's give the OP some real answers.

Exhaust = titanium.
Change all the metal bits you can for titanium or aluminium.
Drill all the bits that you can't change for the above.
Get fiberglass fairings and lose some weight yourself.

Now for the engine = big bore kit + pay the specialist for the tune up.
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'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Teflon-Mike]

CBR125's been around a while & gone through at least one major re-design. I'm trying to remember whether the very first had carbs or if they have all had fuel injection, these sort of things do rather influence matters. All model's though are down almost 2bhp on what A1 Learner Licences 'may' permit, as they are one of the lighter bikes in class to start with.

In their early days, there was a 'Factory' HRC race-kit for them, for Mini-Stocks 125 racing. Comprised a pair of hi-lift cams, a lighter, but 'race legal' (103dB, ISTR) pipe and revised fuel map. There may have been other goodies in the box, like lightweight 'replica' plastics and possibly a different back shock & brake pads. 'Kit' gave the motor about 16/17bhp ISTR, and REALLY is about the best you can hope to do with one.

The HRC kit cams hint at the 'problem' trying to tune a CBR125 motor; those HRC cams, liberated an extra 15% more power from the thing without any extra displacement. So, you can muck about to your hearts content, but if the cams don't open valves far enough or long enough to let in enough 'charge' to make more than 13bhp, it don't matter much how bigger the hole beneath them is, or how big the holes in front of them are, those valves still wont flow any more charge, so you wont get any more power.

Tiddler Tuning is a general exercise in futility, where at best, you'll likely get no real measurable gain for whatever you try do, however much you spend. And most likely, you will actually loose both performance and reliability in equal measure to your efforts.

Meanwhile 'Power to Weight'... weight has no influence on top speed; that's purely a function of power vs drag. Does make a difference to acceleration, but, PTW is rather misleading on bikes, where the 'weight' the power has to shift is the 'all up' weight of bike + rider, where even on a 200Kg heavyweight, the 80Kg or so of rider, is quite a significant factor, it isn't to cars where the driver is likely less than 1/1oth the vehicle weight. On a 125Kg lightweight? The rider can almost halve the PTW ratio!

You can save a few grams from ditching the indicators or using titanium clutch cover screws I suppose.... B-U-T in the scale of thing, taking loose change and unused keys out your pocket would probably make as much difference! Heck, leaving your Smart-Phone at home, probably save as much mass as a 'race' exhaust!

As has been said, for the road, it's all rather pointless; if you actually achieve anything, then it will almost certainly breach L-Plate/A1 licence regs, and if you have a licence to ride the thing legally you could have got an awful lot more, an awful lot more cheaply ad easily, just by buying something else!! Heck, even the fastest of the fast illegal on L's/A1 125's, the Aprilia RS or Cagva Mito two-strokes, that might just scare 30bhp, and 100MPH, are only just about as powerful and quick as an old 250cc commuter bike!

For the track? Old Padock Lore: Want a faster bike? Fit a Better Rider!

A better rider, will go quicker, without necessarily going any faster; they'll be 'smooth', they'll not 'waste' speed slowing down so much to have to speed up again so often; they'll not load the tyres with violent action, so save grip to react higher corner speeds; so it will 'look' all rather un-dramatic, but they'll get the absolute most the bike can deliver, whatever that happens to be.... and time and time and time again, in the heat of real competition where points mean prizes not penalties and the stop watch never lies; them 'better riders' get far more impressive 'results' from that pure talent than thier mechanics can ever find them from a bit of tinkering or even a heck of a lot of 'cheating'!!!!

To wit.. most will be found improving your riding, NOT your bike...

Better rider? Makes the bike go faster, and further, between services and doesn't crash. So, its all win; bike holds its value; whilst not costing any more to run or insure. AND better rider fits any bike it's fitted to.. 'no cost'.. It's ALL win.

So... my advice, forget trying to tune a tiddler; work on that 'better rider'.. go get trained, go get that licence you suggest you plan in your profile.
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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?'

[stevo as b4]

I didn't know OP was a hopeful on a hiding to nothing newbie, desperate for a tiny bit more interim speed. His post didn't come across that way, like the countless fools that say 'make my xxx faster for 3ponds'

I thought race use hence my reply.

I also disagreed really with the weight loss idea, as I thought he was after power and speed, not making the most of what's already a light bike, with little weight to loose reliably without making it fragile.

Big bhp increases affect top speed and high speed acceleration unless your looking at aerodynamics in a committed serious way to the point of a stream liner or speed record machine. Weight does not have any effect really on top speed once your going quick enough for wind resistance to matter.

[redeem ouzzer]

^^disregard Captain 'Tism (teffers) up there.

More power will make you faster in a straight line. Less weight will make you faster EVERYWHERE.

But you have to be autistic about it.

Battery - small or replaced with an eliminator
Starter motor and relay - scrap bin
Clocks - minimise
Ignition switch - remove

Anything not needed for propulsion should be open to review, trust me, once you start throwing stuff away it gets addictive.
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[Rogerborg]

OP was just on about getting an FZ6 (on A2?) but only if he can find the right flyscreen to make it be bitchin'.

So I'd suggest the ideal bike is an R6. Imaginary ones can be as light as you like.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[notbike]

If a panigale engine can fit inside a grom, it can fit in your CBR125, just saying. Pic related.

https://www.todocircuito.com/ckfinder/userfiles/images/honda-msx-panigale-ducati.jpg

[stevo as b4]

He must have had trouble wording his post then, as where I come from CBR125 is spelt differently to FZ6?

I like light bikes, love them even. But say on my own 125 that started out at 99kg dry, I've maybe lost 3-4kg from it having a non std exhaust, rear light and numberplate holder, alloy handlebars and the removal of the oil pump and cables?

For road use it doesn't seem to make any difference, and unless I weigh it against a std bike I doubt I'd know it's lighter? I certainly wouldn't feel the difference lifting it onto a workstand. But I would agree that for off road trials or enduro use, having it weigh 90kg is better and less tiring over the day than it being 100kg.

[definitelyinc...]

Had a CBR 125 '15 plate, no point in m odding it, keep it stock, tidy and work towards a full license, nothing matches up to going from a 125 to a 650, just saying, sell off said 125 for as much as possible, job done.

Edit: Even someone I know who has a derestricted 2 stroke 125 which (I think) makes 33bhp when derestricted is left behind in the dust by my heavier, restricted 650cc, so no matter how hard you work to mod it you won't get any more adrenaline from it than you already do :/

[arry]

[Ste]

If you want a fast 125 then you should get a two stroke.

[Rogerborg]

Oh, lordy, yes.

Crashed his scootay on his first ride, totes not his fault.

Had 3 days of A2 lessons, ragequit.

Is possible restrict KTM Superduke 1290 for A2 tho?

Want FZ6 S2 naow (still no licence, hasn't spotted that the FZ6 isn't legal for A2 anyway).

Rather than investing in a licence, is thinking about pouring money down the 4-stroke 125 racebike hole.

Serial fantasist manchild.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[definitelyinc...]

[Hong Kong Phooey]

[definitelyinc...]

[Arcane1729]

[Teflon-Mike]