100 MPG Madness, Project Aprilia SR50 Part 5- More Power!


Project Aprilia SR50 more power!
Project Aprilia SR50 more power!
The regulator itself bolts to the right side of the engine case using the supplied bracket.  The hoses connect to the factory quick disconnect fittings on the injector and that’s about it!

The High Gain Regulator opens up the possibility of a whole new range of tuning potential for the DiTech engine.  Now we are toying with the idea of more radical porting and perhaps a little more compression.  The main side effect that we were not too keen on was that our fuel economy dropped to 90 mpg.  We guess this isn’t bad for something that is as flexible as our bike is for driving nearly anywhere except for the freeway.

Project Aprilia SR50 more power!
 The regulator allows you to take advantage of the flow gains beyond your basic bolt ons and beyond the tuning of the piggyback ECU.  The regulator is one of the most important tuning tools for the DiTech.

Now our scooter has power, looks, brakes and handling as well as green low emissions and killer fuel economy.  We have achieved our goals of having cool urban transport and use our SR50 to save gas running errands around our office.  We also use it as a cool pit bike and to help our photographers get around quickly at events.  Are we done?  Not necessarily, we are always looking for ways to get more power.  We will keep you updated as we continue to tweak Project SR50.

Project Aprilia SR50 more power!
With a lighter rider our bike can loft the front wheel.  This isn’t some lame stunter wheelie but a power wheelie.
Project Aprilia SR50 more power!
Our project bike is about as cool as a scooter can be!


High Gain Tuning

Scooter Dynasty

Provo Scooters

WPC Treatment





  1. Bonjour
    Pouvez vous me donner le branchement des durites du régulateur de pression essence et l’affectation de chaque durites s’il vous plait je suis en france et j’ai pas ce type de pieces toutes faites
    Can you please give me the connection of the fuel pressure regulator and the assignment of each hoses
    Thank you , l’m in France

    1. The regulator goes inline between the fuel pump and the injector. You need to take the higher pressure reference for the regulator off of the top of the air injector.

  2. Hello, I also want to install the larger throttle valve (26mm) on my Gilera Runner Purejet. However, I can’t find these anymore. Are these still available to buy somewhere or do you still have one? Kind regards from Germany Victor

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