Welcome to my aprilia RS125 Tuning Page

There are many tried and tested ways of making your 15bhp 95mph RS italian head turner go FASTER!!!!!!!!!!!!

and here they are.........

A good way to start is by replacing your exhaust system with a full race spec. Arrow exhaust system. This will increase acceleration and top end power by providing a quicker escape route for the fumes created in your combustion chamber. Slight acceleration and upto 10mph gaines at top end can be expected.  Costs around £180.

Try putting in a bigger barrel. The Polini 160 cm3 kit (pictured left) is available for around £160, this will increase top end speeds by upto 20 mph and will help no end with your acceleration. Although a great addition to your bike, there is a greater risk of an engine seizure with this bit of kit.

The first way an RS125 is restricted is by removing the power valve, a power valve is made up of two main parts, the guilotene and the solenoid motor. The guilotene sits in your exhaust port and regulates how big the exhaust port hole is, this is attached to a solenoid motor which pulls the guilotene out of the exhaust port at around 3000 rpm thus increasing the air flow, the solenoid then pushes the guilotene back into the port at around 7500 - 8000 rpm. You can tell if your bike has a powervalve by

switching your ignition on without starting the engine and listening for the sound of an electric motor. If you can hear the motor then your bike is not restricted this way, if you cant hear this motor then go out and bye one for around £170 and get a two-stroke mechanic to fit it for you.  This will greatly increase your acceleration.

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