dose any one know how to derestrict my derbi gpr 50 racing

[jamieward]

dose any one know where the restrictors are in my bike and how i would take them out to make it go faster



plz help thanks jamie
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first bike was a derbi gpr 50 got some right looks when I fired up lol
second bike is a tuono rs 125 love the bike keeps up with the 600's

[R6 Wilson]

Check to see if there's an air restricting washer in the carb between the filter and the carb

Could be the other kind though, which I believe is somewhere near the clutch bit
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♥ YZF-R6 '05 ♥
Time is money so I stay late

[jamieward]

hey


there is a golden plate in one of the tubes for the air flow and i took it out and it was running like shit and not starting so i put it back in i dont know if ive done the right thing mate
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first bike was a derbi gpr 50 got some right looks when I fired up lol
second bike is a tuono rs 125 love the bike keeps up with the 600's

[R6 Wilson]

Was it like a metal circle with holes in it?

I'm certain that's the restriction, you'll need to take it out and altar the air/fuel mixture to compensate for the increase in air going in to the engine
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♥ YZF-R6 '05 ♥
Time is money so I stay late

[Bike Bunker]

R6 Wilson is right ....will also be a part of your exhaust (most likley the near where it comes out of the engine ....with another pipe coming off and going back into the engine ...(ithink this slows down the rate carbon leaves the bike as it sends some back in not100% though) but i know that if you take that off and weld up the gaps it unrestricts 1 part of the exhaust.....most likley other restrictions in the exhaust too.........on the up side the bike is probly worth over 1k possibly near 2k if its newer sell it get a big bike

[R6 Wilson]

[jamieward]

do you think its hard to alter the mix and would this make it pick up speed faster
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first bike was a derbi gpr 50 got some right looks when I fired up lol
second bike is a tuono rs 125 love the bike keeps up with the 600's

[R6 Wilson]

That is the restrictor, yes.

And to altar the fuel/air mixture you turn one of the screws on the carburettor. If you don't have a clue what you are doing I'd recommend asking the help of someone who does, but if you don't and want to risk it go ahead, have a look in your manual which screw does which and play with them a slight turn at a time until it's right

Yes it'll make it faster, your ped isn't going fast because the amount of air taken in to the engine, the more air you can get in, the more fuel you can get in, the bigger the bang, the faster the movement! Good luck
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♥ YZF-R6 '05 ♥
Time is money so I stay late

[connornrg]

The screw on the carb will only effect the engine when at idle. You WILL need a new jet, search the scooter forums for a recommendation of where to start jet wise. Buy a new exhaust or derestrict the current one.
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Bikes (Not Bikes Really Just Shitty Mopeds)
**04 - Piaggio NRG MC3**02 - Yamaha Aerox 50/100**07 - Piaggio NRG Power - Shit.**

[R6 Wilson]

[jamieward]

dose any one know where i can find out what jet i will need to put in my bike and where i would get one from and how much are them
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first bike was a derbi gpr 50 got some right looks when I fired up lol
second bike is a tuono rs 125 love the bike keeps up with the 600's

[jamieward]

hello thanks for the help Ive just took the carb apart and found the main jet it was a size 89 jet so what should i upgrade it to ? and will i need to upgrade the other jets or will they be ok ?



thanks for your time and help Smile
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first bike was a derbi gpr 50 got some right looks when I fired up lol
second bike is a tuono rs 125 love the bike keeps up with the 600's

[Clutchy]

If its taken you 291 days just to find out what jet size it is, i'd highly recommend just getting a bigger bike, you'll enjoy it 10 fold
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Malaguti F12 Phantom-Dead, Suzuki AY50- Dead, NRG power DD LQ, CBR125.
*33 BHP restriction up on 10/12/14* Current bikes/car: SV 650 S/ MKIV GOLF
Guide to pass your test with no lessons!

[Wilzon_3r3]

Speaking from experience ... Dont bother doing it unless your going to do it properly and know what your doing .... or just DONT BOTHER at all!

I had a Derbi Senda SM50 Limited Edition, mine was de-restricted and would hit 58mph (reving the bollox off it) and 50-53 on a flat.

It didnt last long mate... Ive now upgraded to a Honda NSR125F and its the best thing i ever did, is pretty quick, comfy & im not filling up every 10 mile because of sh*t small tank.
You can get them cheap enough if you look hard enough... i got mine for £800! BARGAIN!!

GET A 125 Mate!
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Currently Riding a Honda NSR125F 1989 Italian Import Full Power ... Beauty

[Usher4566]

Have you deristricted exhaust?
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New cd200 benly owner

[Drake]

pour sugar in the petrol tank
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[HD]

Your going to need to derestrict the exhaust or buy another, change the jets and keep fannying around with them til you get it right.

It sounds easy but there is a hell of a lot of work and a massive ballache. I bought a derestricted bike and had to rejet as I put a different exhaust on. Complete pain in the ass and as above, the max speed for me was 55 screaming it downhill.

Just wait til you are 17 and buy a 125 or do your test, best thing you can do. It will sell better standard as well. Just out of interest, whens your 17th?
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Rusty '02 Vito Camper + CBR600F3

[jamieward]

thanks for the help im 17 in october so im thinking if i go in for my a2 test i can ride any bike restrictewd to 33 bhp so im thinking of deristricting my bike so i can get the feel for the power
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first bike was a derbi gpr 50 got some right looks when I fired up lol
second bike is a tuono rs 125 love the bike keeps up with the 600's

[HD]

[adascool]

does someone know where is derbi gpr restrictor

[slowasyoulike]

Well, considering it took OP the best part of a year to find the carb jet he may well have worked out how to derestrict his moped after 11 years... you never know.

In the meantime, 10 seconds on Google found this:
https://www.apriliaforum.com/forums/showthread.php?194212-help-with-derestricting

Apparently it depends on which revision of the machine you have, which unfortunately is one of the many facts you have failed to tell us...

[Rob Fzs]

I'd be amazed if there's any of these bikes left that are still restricted
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30> Yamaha RD350 YPVS F2 > Kawasaki ZZR 600 D1 > Yamaha TZR 250 2MA >Suzuki TL1000R > Yamaha TDR250 > Honda 929 blade > Suzuki SV1000 > Honda H100
Mod 2 Passed 09/06/2011

[MCN]

I'd be even more amazed if de-restricting made any significant benefit in speed.
It's a 50cc (48/49cc).

You can't squeeze much more out of a 50.

Unless you only expect it to last a few months.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Nobby the Bastard]

There's a reason why highly stressed engines are quoted to have hours running rather than miles driven when sold.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[mentalboy]