yamaha yzf r125

[urmum145]

can anyone give me some ideas on how to increase the acceleration or top speed of a yxf r125 please?
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[G]

By far the most 'sensible' way would be to sell it and buy a faster bike - possibly using some of the money you save to pass your test if you haven't.

I believe there are a few mods to make fairly marginal gains, but a metaphor I've used before - it's like spending a load of time and money making a BMX faster, when you could just get a mountain bike that's much more suitable for going fast.

[NickD]

Do you have access to a mineshaft?

As I understand it they're close to as fast as they get as standard. Get rid and go big!
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I was only doing what it said on my licence officer....
Tear along the dotted line!

[urmum145]

Nkd666

believe me i would if i could, but im stuck with a 125 for 18 more months
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[Tom_B1H]

Why are you?
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Previous: '08 Suzuki DRZ400SM > '04 Kawasaki ZX-6R B1H
Current: '07 Kawasaki ZX-6R P7F

[BenR]

I see everyone's giving the usual "sell & get a bigger bike" advice/routine. Why peeps just can't answer the question is beyond me.

You could try mucking about with your sprockets although you will only get better acceleration or top speed. There are plenty of de-cat exhausts available if you're willing to spend the money but really you will need to mod your air filter & fuelling as well. Depends on how deep your pockets are & how far you're willing to go.
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Current bikes: suzuki RG125UN wolf. Yamaha MT-07

[The999Kid]

[urmum145]

BenR

thanks, about time there was a proper answer
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[Mord]

Trying to make R125 faster is like trying to make VW Polo 1.0 faster, but people do it so hey... lol

1) One tooth smaller front sprocket = better acceleration, a bit lower top speed

2) for the 15 bhp bike the best mod you can do is.. losing its and riders weight. I'm not joking. The first can be expensive, the second cost nothing, you actually get money from that.

3) Big bore kit + exhaust = crazy money for 2-3bhp increase. Do it, do it!

Anyway this is a direction youre heading to - Yamaha R125 with 182cc big bore kit showing its impressive acceleration...

https://www.youtube.com/watch?v=zSIOdnag9cA

[Ste]

[Noxious89123]

[Doovy]

[patience]

Hiya buddy I got my yzf r125 about 2 months ago, Im 6ft 3" and i fit the bike perfectly the bike has been designed with the taller person in mind. I did the plymouth Mega ride on it and managed to get 77 out of it. There is restriction in the exaust (catylic converters) im thinking about getting a micron exaust on mine wich gives me an extra 2.5bhp. not sure deristricting it would do much. dunno.
Anyway its a top bike so go get it.
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buy r4 ds

[Wilson123]

It seems this forum is run on people telling others to do such a thing and get such a bike :l

Turns out some people have 4 stroke 125s, turns out they have a reason not to sell it, do their test and ride around on a pepped out 600 until they can afford something flash, some people aren't 21+ with full time jobs

It also turns out that I agree with these people in a way, don't fuck about with it trying to make it faster, not because I'm 30 with a superbike and I want to reassure you that no matter how hard you try you won't be able to keep up, but because if you don't know what you're doing you'll most likely end up fucking your bike up(and the R125 is a sexy bike so please don't do that :l)

Also, like others said, waste of time/money
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Doug97 wrote: Fuck you, what they did was awesome. You just wish you had the balls to be like them, instead of being constantly afraid that there's a rule somewhere out there you might be breaking.

[G]

[BenR]

[Ste]

People are reading the question and are giving the best answer.

He could pour lots of money into making it faster, and the bike will go slightly faster. Or, he could just sell it and buy a faster bike. That will be less expensive than tuning the YZF-R125 and will go faster than a tuned YZF-R125.

There isn't a good reason for spending lots of money tuning a YZF-R125 as if you want to go faster you should get a faster bike.

[BenR]

[Ste]

Yes, it is their money and it is their choice.

I'm not saying to sell it and get a bigger bike, I'm saying to sell it and get a 2 stroke 125 as they are a lot faster than a YZF-R125. The owners might not like that fact, but it's still true.

No one has made any secret of the fact that they can pour lots of money into trying to tune their YZF-R125 if they really want to, that is completely their decision is they want to. But, it's much less expensive and much easier to just sell the slow YZF-R125 and buy a 2 stroke 125 which will be lots faster than a 'tuned' YZF-R125.

It's similar to someone spending lots of money 'tuning' a 1 litre fiesta, they could spend lots of money on it and they'll make slight improvements to the speed and acceleration of the car. But it would much easier and much cheaper for them to just sell the fiesta and buy a faster car.

The slow YZF-R125 might be their 'pride and joy' but I'm pretty sure if they sold it and then bought a faster 2 stroke 125 then that would very quickly become their 'pride and joy'.

[G]

[stevo as b4]

It looks to be fairly tunable from the aftermarket parts that have now become available for it. You will need to spend £££'s or more to get a noticable decent gain in power from it. They make about 12.2bhp at the rear tyre, and i think at 125cc you might get it up to 15bhp r/w. For alot more cash, probabaly £1k+ you could get a bigger capacity engine conversion kit, and with alot of parts added to this and set up correctly (which would be another few £££), then i reckon a big bore tuned nasp conversion would see anything up to 22bhp r/w. This should allow a genuine 85-90mph with the right gearing.

However this is the nearly at performance level of a std but de-restricted NSR125 or TZR125R, so you will spend alot of cash for a relatively small if still noticable gain in performance. If you are keeping the bike many years and have the cash to blow on it, then fair enough! If your waiting to do your test or saving for a bigger bike in 12months then just forget touching it at all!

I doubt you will get much for such a seriously modifed bike at re-sale time, so you need to think about it carefully IMO. I'm afraid i've been there and got the T-shirt, from my speedfight tuning days. For what i spent on that bike i could have brought a brand new TDR125, and added a few nice aftermarket parts, and been much happier with the end result too!

[TUG]

[T0MMY]

Anyone else think this is a troll?

...Anyway, have to agree with the "don't bother" sentiments, I think it's a perfectly reasonable answer to the question posed. You know what its like at that age, you don't know jack shit...no offence Leave it alone then pass your test or get a 2 stroke. Clearly a total waste of money to do anything else and you'll be bored of any minor increase in power just as fast as you got bored of the current power.
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ZX6R + CBR600RR