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Keihin® Professional Edition

For calculation please enter the 3-digit needle code into the following boxes. The current values will be shown immediately and could be adjusted due to your specification via the +/- buttons.

Needles

Needle comparison: None

Range

Value

Characteristic (Lean Rich)

Taper (A)

1/4 to 3/4 slide position

n.a.

Height (L1)

1/4 to 1/2 slide position

n.a.

Diameter (D)

1/8 to 1/4 slide position

n.a.

For calculation please enter your current pilot and main jet into the following boxes. The current values will be shown immediately in the graph below and could be adjusted due to your specification via the +/- buttons.

Jets

Comparison jets

35

Pilot jet (PJ)

closed to 1/2 slide position
112

Main jet (MJ)

1/2 slide position to fully open

Jet comparison: None

For comparison please enter your current and alternative setting into the following boxes.

Current setting

PJ MJ Needle Clip Carburetor

BS

Alternative setting

PJ MJ Needle Clip Carburetor

V1
V2
V3

Slide position

Choose a slide position to highlight the corresponding chart area and show the components acting there.

50 % · 1/2
ClosedOpen
Components active in this area
ND Needle diameter Needle taper Clip HD

The highlighted zone is a guide. Component influence ranges overlap.

Setup evaluation (delta)

The comparison setups are evaluated against the current base setup across four slide-position ranges. Positive delta values mean richer, negative values leaner.

Δ %

After “Evaluate”, the delta evaluation of the available comparison setups will appear here.

Delta values are averages of the already calculated curve within each slide-position range; they are not an additional calculation or recommendation.

Setup Garage

Save the current base setup locally in this browser and load it later as the base or a comparison.

0 Saved setups

No setups saved yet.

Change history

Changes to the current base setup are recorded locally in this browser. Earlier or later states can be loaded at any time. A maximum of 100 changes is stored; when more are added, the oldest entry is removed automatically. Up to 3 entries are shown at once, with additional entries available by scrolling.

0 Changes

No base-setup changes recorded yet.

Tuning assistant

Choose the observed engine behaviour and the affected slide-position range. The assistant ranks the carburettor components most likely to matter and explains the direction to check.

Reference setup

This input row mirrors the reference setup in “Jetting” and is synchronized automatically between both tabs.

PJ MJ Needle Clip Carburetor

BS

Optional: the most recently calculated environment values are shown as an air-density note. They do not automatically change the recommendation.

The assistant is a rule-based guide. It never changes setup values automatically and does not replace checks of combustion, engine temperature or mechanical condition.

Test history

Completed real-world test steps are documented locally in this browser.

0 entries

No completed test step has been documented yet.

Environmental check

Check how current environmental conditions change air density and mixture tendency compared with the reference.

°C
m
hPa
%
Near reference
Air density–
Relative air density–
Pressure used–
RicherReferenceLeaner

Reference: 20 °C, 0 m, 1013.25 hPa and 50% relative humidity. If no local pressure is entered, it is estimated from altitude.

Note: This environmental check is a physical guide, not an automatic jet recommendation. Engine condition, fuel, intake and exhaust can also affect real behaviour.