Protek Samurai 321B Instruction Manual page 17

rce it to turn further.
Open
approx 0.5mm
F I N A L A D J U S T M E N T
mm open
ng with the
moved.
• Final adjustment should be performed only after the break-in has been completed.
High Speed Needle
when
se the high speed
dle approximately
HIGH SPEED NEEDLE
as needed. This
Open
cedure will be repeated
eral times throughout
break-in process.
More fuel Less fuel
• Run the vehicle down the longest straight away at full throttle to observe the speed. Bring
the car back to the starting point, close the high speed needle 30° and repeat the run,
taking note of the improvement in performance.
• Continue with additional runs, gradually reducing the high speed needle setting with a goal
to achieve the highest straight line speed. Remember that if the high speed needle is shut
too far the engine will run lean and overheat, accompanied by visibly diminished exhaust
smoke. At this point the model will begin to lose speed. If this happens, throttle down
immediately, stop the vehicle and open the high speed needle 45-90°.
Glowplug
21
Needle
Cylinder Liner
Idle Screw
Low Speed Needle
LOW SPEED NEEDLE
Crankshaft
Close
Close Open
Slight taper
More fuel Less fuel
When the engine is cold.
Rotate the retainer
nut gently until it stops
Exhaust
Chamfer inside edges of bearers
I N S TA L L AT I O N O F
T H E C A R B U R E T O R
Carburetor Body
Ball Link
The carburetor is only lightly installed into the intake boss when it leaves the factory. Follow
Near TDC
the steps below to complete the installation.
Rotate the low speed needle until the head
sticks out 0.5mm from the ball link body.
1 Loosen the retainer screw, rotate the carburetor into the position that best suits your
This is the standard position.
application and make sure that it is fully seated into the intake boss, compressing the
rubber gasket.
2 Gently turn the retainer screw until it stops, then tighten it an additional 120° - 180°. Do
When the engine is cold.
Low Speed Needle Piston
not over tighten the screw as this will damage the carburetor body.
Slide Valve
5.5 turns out. Make adjustments with the slide in the open position.
First rotate the mid needle until its slotted
head is ush with the carburetor body. This is the
standard position.
Glowplug
Mid Needle
Exhaust
2¾ turns out. Make adjustments with the slide in the open position!
Gasket
Carburetor Body
NOTE: Be careful not to damage the o-rings when removing the carburetor retainer from
the engine. Do not push the part in or it could damage the o-rings.
When the engine is hot.
Element glows when energized
Tighten a further
Replace the plug when the
120º - 180º
element does not glow or is
burnt out.
Glow Plug Igniter
bottom of crankcase
to touch chassis
Crankshaft
Slight taper
When the engine is hot.
Rotate the retainer
nut gently until it stops
Turn the high speed needle clockwise
until it stops. This is the fully closed
position. Do not force it to turn further.
O-Ring
Pliers
Approx. 0.5mm open
factory setting with the
restrictor removed.
O-Ring
approx 1mm
O-Ring
Tighten a further
120º - 180º
Close
High Spee
Needle
Open
approx 0.5mm
Retaining Screw
High Speed Needle
14
Dirt and dust may lodge in marked pla