Home :: GUIDE - Torini Clubmaxx Fuel Jetting Settings

GUIDE - Torini Clubmaxx Fuel Jetting Settings

GUIDE - Torini Clubmaxx Fuel Jetting Settings

 

TC210 CLUBMAXX
JETTING YOUR CARBURETTOR

JETTING YOUR CARBURETTOR FOR:
• BEST PERFORMANCE
• CORRECT ENGINE TEMPERATURE
(Cylinder head 230~240°C)
• INCREASED ENGINE LIFE

FROM THE FACTORY: The carburetor is supplied with Main Jet
96 - Pilot Jet 45. In many cases, this would be considered as a
rich setng but is done to protect against running the engine too
lean straight out of the box.

AS A STARTING POINT, in areas less than 300m above sea level
and with temperatures above 20°C, we suggest startng with a
94 Main Jet and a larger (Red O-ring) 40 Pilot Jet.

ADJUSTING YOUR IDLE SPEED:
ENGINE IDLE SPEED - 2,000RPM

• Increase Idle Speed:
Using a screwdriver, turn clockwise
• Decrease Idle Speed:
Using a screwdriver, turn ant-clockwise

 

CHOKE LEVER:
The choke lever opens and closes the
choke valve in the carburetor.

• Push the choke lever into the
START positon for startng.
• Afer startng, slowly move the
choke lever to the RUN positon.


The carburetor mixes fuel and air at a precise rato, before it goes into the engine to be burnt.


When the fuel air mixture is correct, the engine performs at its best. However this precise fuel air rato is
affected by a number of outside influences, most signifcantly – alttude (air pressure) and temperature, but is
also affected to a lesser degree by humidity.


The factory supplied jetng is a startng point only; for optmum performance you will need to read the spark
plug and engine temperature under track conditons to determine the optmum jet sizing required.


Racing on tracks that are more than 300 meters above sea level, or in a different temperature range (+ - 10°C),
requires that you re-jet your carburetor to compensate.


Going higher results in lower air pressure (lower air density). When racing at higher elevatons your engine is
getng less air, so it needs less fuel (a smaller jet) in order to maintain the correct fuel/air rato. Under such
conditons your horsepower will also go down, this is both unavoidable and universal for all compettors, you
can fgure on losing about 3% of your engine power for every 300m (1000 f) of elevaton.
Now if overnight it gets really COLD! You should also be thinking about re-jetng again! Cold air is dense air,
and dense air requires more fuel (a bigger jet). The jet you won the race with yesterday afernoon (when it was
hot), will be too lean now, you need a bigger jet to run properly when it’s cold. Air temperature makes that
much difference! If the temperature is just 10 degrees colder than it was when last you raced, then you risk
damaging the engine by running too lean, if you don’t change to a larger main jet.


MAIN JET
The Main Jet; is the most critcal for ensuring full power operaton, correct engine temperature and thereby a
long engine life.

PILOT JET

The Pilot jet and the low-speed idle mixture screw; work together, the pilot jet controls the amount of fuel
available and the low-speed idle mixture screw allows you to precisely control the idle mixture being allowed
into the engine at idle.


To recap a bigger main jet has a bigger hole in it, which lets more fuel into the engine making it richer!
Straight forward enough, but the main jet is also absolutely CRITICAL to high-speed engine operaton in
another way. Not only does it meter the amount of fuel going into the engine, it also controls the running
temperature of the engine as well. If you run too lean the engine will overheat causing damage.


A correctly sized main jet will let the engine make good power for a long tme without overheatng. The
problem is that a main jet just 1 size too small may make greater power, but the engine life will suffer as the
operatng temperature becomes extreme. A slightly rich mixture burns cooler than a lean one, so be sure the
main jet is big enough.

 


MAIN JET SIZES: 
88, 89, 90, 91, 92,
93, 94, 95, 96, 97

PILOT JET SIZES:

0690, 40, 43, 45.

 

RICH LEAN
What does a spark plug look like for different mixture conditons?
To obtain an accurate plug reading, run the engine on track for at least 20 minutes, as a new plug will not colour
immediately. A spark plug can only be read correctly, if the engine is shut down immediately afer entering the
pit lane area; do not allow the engine to idle.


The area you are interested in,
is known as the
Fuel Ring
RICH
= Sooty, Black in
colour
OPTIMAL = Light Grey / tan
in colour
LEAN = Extreme white with
aluminium specs