Question about Derbi GPR 125 Racing Motorcycles

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Try this

will show you how to do it


Posted on Mar 14, 2011

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How do I de-restrict a 2008 axon 50

Spend more than a new (better) bike will cost, to replace the restrictive parts, Exhaust, ECU, Camshaft and cylinder head. Then put it all on your bike. In other words -It isn't worth it. It will cost more to do than exchanging your bike for a better one.

Sep 14, 2013 | 2008 Qlink Axon 50

1 Answer

Increasing top end 125 4 stroke

de-restrict the exhaust , leave the engine alone, may cause more problems.

Mar 20, 2013 | Motorcycles

1 Answer

Why do none of your so called experts know how to de restrict an a.j.s.125 dde, or even answer if it can be done

different bikes restrict by different means, sometimes smaller carbs are put on other times the jets are just changed to a lower width, the exhaust shape can restrict airflow from the engine. sometimes the airbox restricts flow into the engine. so first stop is check how high a jet you can get for carb, maybe get a jet air filter racing kit.may need to change exhaust for a power pipe. you can put a bigger sprocket on front end for less accelleration but higher top end or smaller for higher accelleration. you can put a bigger sprocket on back for greater accelleration loosing top end. you could change the piston for a higher compression piston and/ or have the head skimmed. the list goes on and if its a 2stroke there's reed valve to play with.

Mar 18, 2013 | Motorcycles

2 Answers

My qlink axon 50, 2007 i believe, is a little slow for me. How can i make it faster without boring it over?

if u can take some hardware off bike-cud help-its only a 50--research racing modifications-library sec629 or online--changing jets on carb or injector helps but u need a pro tech or u cud fry engine

Nov 16, 2011 | 2008 Qlink Axon 50

1 Answer

I would like a method to de-restrict the mufflers for 'some' more exhaust noise. any re-jetting advice would be appreciated. thanx

Removing the baffles will do that but the engine will require retiming. I would purchase some Screaming Eagles or some such slash cut pipes.
Check out ebay for ideas.

Feb 26, 2011 | 2006 kawasaki W 400

1 Answer

Wanting to de-restrict my bike, it has something to do with or around the inlet manifold, but where`s it at and how?

put a racing exhaust and a racing air filter it shoud go faster but tell your insurance because if you have a crash they will not cover you for the changes

Oct 18, 2010 | Hyosung GT 650 R Motorcycles

2 Answers

How do i de restrict my kmx125

i am led to beleev that restricting a kmx is simply taking off the earth wire for the power valve if you could find a diagram of the pow val system or if you have the haynes manual then earth the pow val if the pow val is working then i cnt help gd luck m8

Apr 08, 2010 | 2000 kawasaki KMX 125

2 Answers


if it seems to be running fine, its probably about as good as its gonna get. the 125 just isn't a power house. you might be able to gain a little bit of extra power through add ons like exhaust, rejetting the carb, etc.

Apr 03, 2010 | 2005 Yamaha DT 125 X

1 Answer


It`s ALREADY de-restricted!!! Restriction is only for keeping the 50cc models in the Moped category so some people whould not need an endorsement and not exceed 30mph,

Nov 10, 2008 | 2005 Kymco People S 200

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