Cbr125r

[onetonedrone]

Hey, ive had my cbr125r for a few months and im hoping to drain alittle extra fun outta it, like firstly, is it a de-restrictable bike or is it made to be a 13bhp bike and no more, secondly is it possible to buy some sort of race exhaust for it, i relise it may sound stupid for a cbr125r but still and thirdly, on my cbr125r it has some very skinny wheels and can bigger wheels be fitted instead.
cheers
Deano!!

[stinkwheel]

Dunno about the rest of it, but WHY do you want to fit bigger wheels to it??

I have ridden one and they go round corners like they are on rails. The only good reason I can think of for fitting wider tyres to a bike would be if you were spinning up the back wheel as you open the throttle. If you say you are doing this on a CBR125R, you are a big fat fibber.

Messing with the tyre sizes will just fuck-up the handling, honda spent a lot of money getting that exactly right so leave it well alone.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Frost]

No you cannot derestrict it.
Yes you can get race exuast systems
no there is no point to getting one
yes you can fit fatter wheels and times
no you cant afford to doit/it is nor a sensible thing to do given the cost, comapired to the improvement it will make.

[wisebeuy]

[rsooty]

There are things you could do to the CBR, but why? I've got one and it rides very smoothly. So what if it doesn't do 80mph? The fastest you should legally go on UK roads is 70mph which this bike can do so just keep it as standard. I must admit I am looking into some smaller indicators for it, but that's just because of personal taste.

Sooty

[Ste]

The CBR125 is full power as standard so you can't make it go faster without doing something like dropping it off a cliff.

You can (I think) get race exhausts but they won't do anything for it (they might claim they'll add lots of BHP to it but they'll add 1 or 2 at the most), will cost lots (few hundred) and will not be road legal so you're at risk of being done by the police and you're insurance would be made invalid technically by it and you have to inform them of all modifactions as well.

If you're willing to pay stupid amounts of money then you should be able to get some bigger wheels for it but you'll then mess the handling up and it'll be crap so there is no point really. Hond aput those sized wheels and tyres on there for a reason as they could quite easily just stuck some CBR600 sized ones on there but they'd be very very crap.

[onetonedrone]

ok, cheers, i just wondered about those factors cause i wanted a cagiva mito or rs125 and i think the wheels must be that big for a reason and i was hoping for more power because yeah 70mph is the limit but come on, people try upgrading haybusa's which are like 170mph bikes standard. you just see those sort of bikes and i guess u hope there is something you can make it that little better, if you get..
thanks any ways guys,

[Trunecka]

What sort of fun do you want from the bike?

If you have to spend most of your riding time in town or rarely ride roads where you get much over 60mph, why not gear it down a little? Sounds strange for a racerep, I know, but it will be even quicker off the line, will teach you to change gear quickly and will pull better wheelies.

And if you've still got buckets of dosh laying around, try to find a single seat for it, most cbr125 riders won't (shouldn't) carry a pillion anyway, and the pillion seat is the only bit of the bike's styling that doesn't look cohesive IMO.

p.s. I had to teach Spellcheck 'dosh'
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[dibbster]

Yep micron do a special aftermarket can for the CBR125 but i wouldn't bother getting one.
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[Last-of-the-nsr's]

[Frost]

186 it is

Normally people downgear them or put an end can on for the noise. Only a serious nutter / someone with too much time ont heir hands upgrades it to improve its top speed

[onetonedrone]

ok ok 186 mph, but wen i said fun, well ive always wanted a mito or rs125 u know, ive pulled 85 at 11000rpm top gear and i thought "can i go faster", but, yeah down gearing sounds cool, or is it possible to bore the bugger out abit, i envy how much faster the rs's and mito's are, but i just wanna go alittle faster and questioned the size of tyres cause the don't look like its be safe for me to try and get my knee down, cause i wanna get it down but then i think how big the wheels and decide not to try

[Dusty]

[Dark_Templar]

Hi there.

i know you people have been posting all the info already buy can someone recap what can be bought or done to the CBR125R.

I'm getting one next thursday (16th Sept 04) as i have had enough of my Yamaha Dragstar 125, coz its the pimple on the bum of biking.

I just want to know - especially from the guy goin on about detuning it - where I can do this, if its possible, as I would prefer to have a top speed of 70 (I read it'll do 75-80 mph) with a much higher acceleration at start off. The reason being I am going to be going to college again, and a lot of the roads I need to travel require quick acceleration to get out onto them.

Please can someone e-mail me @ Dark_Templar@dsl.pipex.com to tell me the information about the exhaust pipes and detuning please.

Many thanks.

Dark_templar

PS. I LIKE THE BLOKE WHO HAS A NAC MAC FEEGLE FOR AN IMAGE!
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I just love biking.

[G]

Wider tyres will make it harder to get your knee down.
The thinner tyres will turn in quicker. Watch some 125 GP racing, they have really skinny tyres.

I presume they have put tyres good enough to get enough grip on there.

The RS125 has 150 section rear I think; the same size as the rs250 which has twice the power, it is definitely not needed.

If you want people to think you've got a bigger bike, why not get a cbr600 sticker?

[Dark_Templar]

I was asking about detuning the bike and the exhaust sets, not wider tyres.

I also gave my e-mail address becasue I don't want to have to keep coming back to this website everytime someone puts a new post up.
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I just love biking.

[Ste]

Well it would seem logical to tick the box next to where it says "Notify me when a reply is posted" under the box where you type posts.

And I assume you actually meant to ask about how to tune the bike to make it accelerate and go faster? You can get race exhausts for it which will claim to add like 1-2bhp but which actually do bugger all for the performance and they're generally bought for the noise and to for tart value.

If you want to go faster there is only one real way to do so, pass your test and get a faster bike. The CBR will be able to keep up with traffic, you'll need to wait for gaps in the traffic which you're able to pull out into without cause other people to have to brake, I very much doubt this would be impossible.

Wider tyres are being talked about because that was one of the original questions in this thread.

[Dark_Templar]

1) I have got the notify me option enabled.

2) I would do my test if I had an odd £350 laying about in my bank account to spend.

2b) My father is paying the difference, so that when I get a job, I'll pay him it back.

3) Even if I did my full licence, I'm only 5 foot 1, and so the bigger bikes I can safely go for are limeted to a) Harley davidson b) Royal Enfield c) Triumph or d) A classic motorcycle that may or may not have a low seat height.

I would include Yamaha in there, but as I am part ex'ing a XVS 125 Dragstar for the CBR, I will not touch another Yama again, with execption to the Virago 535, which is an awesome middleweight cruiser.

Before yu say something along the line of "If your 5 foot 1 why are you gettin a sport bike?" I'll answer you by saying I am getting a tad over a centimetre cut out of the seat, so that it will be 760 ish.

Anyway, I would like to know if the people who stated that detuning is the best mod you can do will put a post OR e-mail me to say what company makes the sprokets and, if possible, the price of the sprockets in general.

Thank you
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I just love biking.

[Kickstart]

Hi

You can change the sprockets to gain a tiny amount of acceleration from a standstill. However on the CBR it is not really going to have any positive effect above 10~20mph. All you do is slightly lower the gearing so that at the same speed the engine is revving higher where it is producing slightly more power, but of course by the time you are ready to change into 2nd gear the advantage is gone. Try people like Supersprox for a different set of sprockets, but see how the bike is first.

At 5'1" there are bikes you can ride. Kawasaki GPX250 or ZZR250 (although old) are small and are UK models, same for the GPZ500S. Also look at a Ducati Monster.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dark_Templar]

Ta.

Are these bikes you mentioned 2 strokes, if they are I really wouldn't fancy them. If I were to buy a 250 it'll be either the CB250 that has just been re modeled or one of the 250 cruisers.

If I were to buy a supersprox sproket, would cutting some more weight down do anything at all?

I weigh a rather impressive 12.4 stone. I really don't care what the top speed is as long as it goes a little faster than 60, which is what my Dragstar 125 did, as long as it doesn't take as long to get there.

i have an advert for Supersprox in my M&P catalogue that is goin on about how their sprokets cut down the wieght of the bike coz their mad of steel and aluminium.

i'd have to get the Suza seat cut down significantly

Won't touch Italian. Also heard from many that Dukes are really crap
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I just love biking.

[Kickstart]

Hi

No, those are 4 strokes.

Being honest the difference in weight from an alloy sprocket over a steel one is going to make very little difference as it is such a small part of the weight of the wheel, tyre, disk, etc.

A 2 stroke putting out as little power as a 4 stroke of the same capacity could easily be very reliable. The reason modern 2 strokes are viewed as unreliable is because they are compared with 4 stroke which produce little more than half as much power.

Why won't you touch Italian bikes? They might (on average) be marginally worse on reliability than Japanese bikes, but realistically you are talking about the difference between 99% reliable and 98% reliable. Basically irrelevant. Certainly my Aprilia RS125 has better build quality than my Suzuki 1200 Bandit (which has frame paint crack off within 6 months of buying it new).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[G]

There's a few short people on here.

CBR400 seems to be a popular choice.
I believe the cagiva raptor was particularly good.

There's plenty of other things you can look at, like getting you seat cut down, suspension lowered etc.

[Dark_Templar]

Ok you've gotten me looking into it.

The only thing is that in since Novenber 02 I have had in this order:

Nov - Mar: Vespa ET4 125 - don't even ask!
Mar - Nov: Gilera DNA 125 - I miss this, but its too easily nicked - u only need a screwdriver ffs

Nov - Sept: Yamaha XVS Dragstar 125 - I was in love with it for about 2 months, then got the problem that it died every time it got wet, then alarm packed up last week.

Sept - god knows when: CBR125R - I wonder if I'll be happy with this, and whether it'll be any good?

I'll buy another bike when:

1) I have a good enough job to afford to do a) My full licence and b) Gotten all my dept paid off.

2) I feel confident enough to go through all sorts of traffic densities and conditions

3) I find a bike I might like for more than a couple of months.

4) if I can find one that might actually have 3rd party parts made for it to make it go faster etc.
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I just love biking.

[Dark_Templar]

By the way, I prefer the look of the NSR too, but I sat on one and found it a little uncomfortable on my wrists, guess I'm one of the unlucky ones who can't ride a 2 stroke crotch rocket

I'll still be happy with my CBR, as I said before, I'm not bothered what the top speed is as long as it goes a little over 60 and gets there quicker, preferably without me falling off or spilling it.

I'm shit scared of gettin on it when I pick it up coz I'm used to the feet forward position of the cruiser I had.
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I just love biking.

[Dark_Templar]

I forgot to put down.

When I can afford the premiums and cope with the worry of whether it'll be nicked overnight or not I'll buy a Cagiva Mito simply coz its the bee's bo**ocks and the dogs knees!
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I just love biking.