How can I derestrict Yamaha SR125 Custom

geminian · L Plate Warrior Joined: 13 Jun 2005 Karma :

Can someone please help.
I have a yamaha sr125 custom on a P reg.
Can someone tell me how to de restrict it?
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John

Ste · Not Work Safe Joined: 01 Sep 2002 Karma :

You can't. Very easy answer. Smile

VFR400UK · Scooby Slapper Joined: 29 Jun 2004 Karma :

https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=97030&item=7161260147&rd=1&ssPageName=WD4V

Josh|RD125LC · World Chat Champion Joined: 08 Sep 2004 Karma :

Unfortunately, as Ste said, you can't de-restrict a 4 stroke, as they are already de-restricted.
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Honda MBX50 | Yamaha RD125LC | Suzuki RG125F Lucky Strike | Suzuki GSF600S
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Andy C · Tree Seeking Missile Joined: 26 Apr 2005 Karma :

what your top speed atm?0-60 time?
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99 RS125 --> 02 SV650s --> 03 Speed Four --> 92 RXS100 --> 93 CB400sf --> 01 CB600f Hornet

colin1 · Captain Safety Joined: 17 Feb 2005 Karma :

I did my cbt on a yam sr125 and didnt like it much. The easiest way to derestrict is to get a aprilia rs125 and sell the sr125.
you can get a decent rs125 for £1000. dunno what your sr125 is worth but if not that much then start saving up
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colin1 is officially faster than god

geminian · L Plate Warrior Joined: 13 Jun 2005 Karma :

guess I cant do it then, I'm getting about 60mph with a fair wind, well in fact a bloody strong wind hee hee.
I was talking to someone and they told me about washers in the exhaust ect. Oh well never mind, I'll start saving up.

Thanks guys Crying or Very sad

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John

Grubby · Spanner Monkey Joined: 15 Aug 2004 Karma :

fit an SR500 engine in it Twisted Evil

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I am me & you are he & we are all together. See how they run like pigs from a gun!

kingsknight · World Chat Champion Joined: 21 Jun 2003 Karma :

i think the SR125 is a nice bike. just a little.......... slow
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TS50 (sold) NS125F (sold) NSR125R-K (write off after 2 crashes) CG125 (nicked) XR125L-3 (Sold )-: ) DR125SM '11 (sold yay) XL125V '12 (In love with this bike) XT600E '04 (fun on the dirt)

no_shad · Trackday Trickster Joined: 17 Apr 2005 Karma :

I did my CBT on one and thought they were pretty much perfect for learning / CBT.

Compared to my cagiva planet though, they are very bland to ride.

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Not alot you can do to get more speed out of a 125 4 stroke im afraid. Ive got a Honda XL125s. it will do a steady 60. and it has a leakey Head gasket at the moment!

I wouldnt go getting a 125 2 stroke because they are like trying to fight an uphill battle with no legs!!!

Once the problems start, They dont stop!

<|Ben|>

BlackSheep · Trackday Trickster Joined: 22 Sep 2004 Karma :

A freeflowing airfilter , such as a K&N , straight through exhaust and jet the carb up , set it all up on a Dyno and you will gain an increase in power.

ANY motorcycle can be tuned for more power. just depends on how much money you want to spend on it.
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GSXR 1100 StreetFighter

geminian · L Plate Warrior Joined: 13 Jun 2005 Karma :

adding a K&N airfilter sounds within my capabilities although the exhaust and jetting carb up is a little over my head I thinks.
Unless it really is quite easy I think I have only 2 options.
Leave it as it is or pay someone to do it.
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John

Bod · Traffic Copper Joined: 18 Mar 2004 Karma :

My mate has just bought a SR125 too, I'll point him to this thread to see what he can do. I have to admit, the SR125 is a nifty bike. I drove one from Darlington to Rochdale last week and it easily got to 65-70 when I was slip streaming lorries. I think the bike is very one fun and excellent to learn on. Thumbs Up

MattShill · Nitrous Nuisance Joined: 13 Mar 2005 Karma :

What's a straight through exhaust? When jetting up the carb is it just the main jet that gets changed/altered or a few components?

A simple yet fairly shite change to make is to tighten the throttle stop screw so the bike idles faster. This means the throttle is slightly more open with the twistgrip at rest, but since there's still the same amount of travel on the twistgrip, you get slightly extra all the way. As a result, with it all the way open you get the old top power plus whatever you've added on with the screw. Just remember that once it's warmed up it'll idle much quicker anyway, you won't get half as much engine braking as before and it can make the bike very difficult to control when slowing down. Not really a clever thing to do, probably not advisable but its a very simple procedure which, if you really want it, can get you a little bit faster. Or at least it did when I tried it.

Or there's the 'chopper' route - Remove everything which is not absolutely vital and replace everything else with something lighter to increase the power/weight ratio. Having said that, on a 4t 125 there isn't much power nor much weight to work with.
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Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

geminian · L Plate Warrior Joined: 13 Jun 2005 Karma :

I think Ive had a great idea how to get my SR125 to go faster!
I currently weigh just over 15 stone, If i can get down to my youthful weight of about 11 1/2 stone I might get an increase of about 5 mph Laughing

what do ya reckon guys......

I think I'm giving up now.. Keith thanks for your input, it makes sense and I had a laugh too.
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John

MattShill · Nitrous Nuisance Joined: 13 Mar 2005 Karma :

Heh, well it looks like the answer really is to pass the test and buy a new bike.
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Living life in the second overtaking lane!

'98 Kwak ER-5

geminian · L Plate Warrior Joined: 13 Jun 2005 Karma :

Yup. guess I've got to do it and take my test, its just this bloody theory and hazard perception I'm not looking forward to. I have had a full licence for over 18 years so realistically I dont stand a chance without going back to skool as it were!!! Crying or Very sad

Still its booked for end July and Ive ordered every learning aid I can find on Amazon. While they do have them training cd's for bikes they only have hazard perception cd's for car drivers. Also, I was reading in MCN that this has been noticed, so what may I ask is anyone doing about it?

Still its good to see that the new roads minister is a biker, restores my faith somewhat.
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John

MattShill · Nitrous Nuisance Joined: 13 Mar 2005 Karma :

What are the differences between the car HP test and the bike one? I can imagine road surfaces being featured, but other than that surely they're pretty similar?
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Living life in the second overtaking lane!

'98 Kwak ER-5

geminian · L Plate Warrior Joined: 13 Jun 2005 Karma :

to be honest I'm not sure, like you say road surfaces and there are weather conditions, puddles, smears on the road. But I would have thought there are hazards more specific to bikers than other road users. Accidents happen because drivers did not see riders ect.
I dont think I am experienced enough to know what the differences if any are.
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John