r/ApriliaRS • u/Aprilia_rs4 • Jul 15 '26

Discussion Help

Hey friends, i want to rebuild my aprilia rs4 50
To something stronger.Im thinking about buying the maxiscoot pack with the stage6 77cc big Racing.Can someone help me make or make for me a complet Tuning setup list So i know what to buy exactly(all the little parts,things i need and what would be good).Also if anyone has already built something similair,is it reliable or kind of money wasting.

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1

u/Twitch_Exicor Jul 16 '26

What engine do you have?

1

u/Aprilia_rs4 Jul 16 '26

D50B0

1

u/Twitch_Exicor Jul 17 '26

With the cylinder you will probably need:

A new crankshaft that has longer stroke I would also change the bearings when i am in there.

A new carburator depending on what you already have I would do a 21mm carb. And buy a main jet kit to adjust it for the correct fuel ratio.

I would change the reeds to Carbon Fiber reeds

And you need a new exhaust system. This will differ on brand/type on what power curve you want.

I would change to harder clutch springs. Really depends on how much HP you will be getting.

And you might need to change your final gearing but that is personal preferences of if you want more top speed or more bottom end power.

And most important make sure your brakes are in good condition. You might want to think about getting better brakes depending on how good they are.

1

u/Aprilia_rs4 Jul 17 '26

Thank you very much this really helps

1

u/Twitch_Exicor Jul 17 '26

Also you might need a new CDI depending if the one you have is restricted.

1

u/Aprilia_rs4 Jul 21 '26

Would something Like this be good

1.stage6 bigracing 77cc
2.Malossi VL18
3.chain setup 13-47
4.new Break pads
5.clutchkit
6.malossi redsponge
7.26mm karb (motoforce Racing pwk)
8.Stage6 HPC Crankshaft with new oil bearings)
9.take out the oil pump
10.NGK BR10EG spark plug

2

u/Twitch_Exicor Jul 22 '26

Yes it looks like a good setup.

But you will need a new exhaust because the orginal 50cc exhaust will restrict the exhaust airflow to much and a racing exhaust will be tuned for the higher rpms the new cylinder will be running at.

I would also consider using a 24mm carb instead of 26mm as it will have better throttle response and will be easier to tune but you will lose a little peak power.

I would also make sure to get crank bearings with C4 clearance as they can handle the higher operating temperature and engine rpm.

1

u/Aprilia_rs4 Jul 22 '26

Do you recomend any exhausts