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Royal Enfield ELECTRA User Manual

Royal Enfield ELECTRA
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carburetor venture.
The
tapered end of the jet
needle fits into the needle jet broach which is
located in the. carburetor body.
The
jet needle virtually blocks the needle
jet when the piston slide is
in
the closed (idle)
position. As the slide is lifted the tapered section .
of the needle rises out of the needle jet, thus
increasing the clearance between them and
allowing more fuel to flow. With the piston valve
raised, the increased airflow creates a sufficient
pressure drop to draw more fuel from the float
bowl and through the needle jet. At approximately
three-quarter lift of piston valve, the clearance
area between the jet needle and the needle jet
becomes greater than the area
of
the main jet.
At this point, the fuel flow is determined primarily
by the size
of
the main jet.
The position of the jet needle relative to the
needle jet determines the amount of fuel flowing
through the clearance between them, changing
the position of the jet needle relative to the slide
changes the air-fuel
mi~ure.
The
jet
needle is
moved relative to the slide
by
changing the
position
of
the E-ring up
or
down in the grooves
on the jet needle. Moving the E-ring towards the
top of the needle has the effect of reducing the
fuel flow, thus leaning out the mixture. Bringing
the E-ring towards the lower grooves will have
the effect of richening the mixture.
DISASSEMBLY
* Unscrew the top cover fixing screw and
remove the diaphragm top cover, piston
valve spring and piston valve assembly
from the carburetor.
* Remove the
ri
.ng and diaphragm from the
piston valve.
* Generally, it is not advisable to remove the
jet
needle. if it is necessary, un screw the
jet needle fixing plate screws and remove
the jet needle along with the jet needle
retainer spring.
* Unscrew the guide holder assembly by
using the right size spanner and remove
the plunger along with the spring.
In
case
of lever type plunger assembly, it comes
out as a single unit.
* Unscrew the mixture control screw along
with its spring, plate washer and o-ring.
* Unscrew the float body fixing screws and
remove the float body from the mixing
beidy.
* If it is absolutely necessary, unscrew the
float toggle pin retaining spring and remove
the float along with the needle valve.
* Unscrew the pilot jet, main jet and main
jet
· holder from the mixing body.
* Remove the needle jet from the mixing
body only if it is necessary.
* Unscrew the drain screw from the float
body.
* Unscrew the pilot air jets from the mixing
body if required.
ASSEMBLING
PROCEDURE
*
Follow
the
reverse
sequence
of
disassembling procedure.
* While assembling the jet needle ensure that
the jet needle ring pin coincides with the
corresponding hole in piston valve.
* When fixing the needle jet ensure that th~
correct concentricity to main jet holder hole
is maintained.
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Royal Enfield ELECTRA Specifications

General IconGeneral
Displacement346 cc
Compression Ratio8.5:1
Max Power19.8 bhp @ 5250 rpm
Max Torque28 Nm @ 4000 rpm
Fuel SystemCarburetor
Transmission5 Speed Constant Mesh
Front SuspensionTelescopic, 35mm forks, 130mm travel
Overall Length2140 mm
Bore x Stroke70 mm x 90 mm
ClutchWet multi-plate
Rear SuspensionTwin shock absorbers with 5-step adjustable preload, 80mm travel
Front Brake280 mm Disc
Rear Brake153 mm Drum
Fuel Tank Capacity13.5 L
Reserve Fuel Capacity2.5 litres
Engine TypeSingle Cylinder, 4 Stroke, Air Cooled

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