Tune your bike with method, not guesswork.
Afinados is a set of calculation tools for engine tuning and preparation. Two are already live: one estimates carburetor geometry and shows, in a curve, how each change of needle, jet, clip or venturi alters fuel passage; the other sizes the ideal carburetor or throttle body for an engine. More tools are on the way.
One curve per setup
Plots the free fuel-passage area across throttle, from idle to full open.
Signed comparison
Overlay two setups and see where one has more area (green) or less (red) than the other.
Free
Use the tools at no cost. Save your setups and open each by its own URL.
From the bench to the track
Understand the curve, compare setups and take to the engine only what the numbers support. Less guessing, more method.
Tools
Afinados grows in preparation tools. Today, carburetor tuning and intake sizing. Soon, more fronts.
Fuel-passage area
Estimate and compare the fuel-passage area of a Mikuni or Keihin carburetor (including drop-in clones such as NIBBI, KOSO and OKO) across throttle position.
Open the toolIntake sizing
Estimate the ideal carburetor or throttle body size for an engine and see how commercial sizes fit the RPM band.
Open the tool- Coming soon
Two-stroke exhaust sizing
Estimate the tuned exhaust geometry for a two-stroke engine.
How it works
Build the setup
Pick needle, needle jet, jets, clip, shim and venturi from the catalog.
Read the curve
Switch the axis between throttle opening and needle travel as needed.
Compare setups
Save and overlay setups to see the difference before touching the engine.
Tune with numbers, not guesswork.
Afinados gives geometric estimates, not measured flow. It does not replace bench, dyno, or track testing. Tune at your own risk.