B A S I C E N G I N E Pa R T S - Protek Samurai 321B Instruction Manual

O-Ring
Retaining Screw
Dirt and dust may lodge in
High Speed
Needle
I N S TA L L I N G D U S T C A P S
When storing the engine install the cap on the exhaust port, carburetor, etc. to prevent dust
from entering the engine. This can cause permanent damage.
Needle
C H E C K I N G T H E E N G I N E
As the engine wears, performance will decrease. It is suggested to replace parts as needed
when the following symptoms are detected.
• Engine sound changes and easily overheats.
• Power has dropped.
Idle Screw
• Idling is unstable and/or engine cuts out when idling.
Low Speed Needle
In most cases, the bearings, piston & sleeve assembly, connecting rod and/or crankcase
EED NEEDLE LOW SPEED NEEDLE
have become worn. Check the parts carefully and replace as needed.
Close
Close Open
More fuel Less fuel
Less fuel
25
marked places
Chamfer inside edges of bearers
Carburetor Body
Ball Link
Rotate the low speed needle until the head
sticks out 0.5mm from the ball link body.
This is the standard position.
Low Speed Needle
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.
Mid Needle
2¾ turns out. Make adjustments with the slide in the open position!
Carburetor Body
Low Speed Needle
(Metering Needle)
Thermo Insulator

B A S I C E N G I N E PA R T S

Do not allow
Cooling Head
bottom of crankcase
to touch chassis
Carburetor
Crankshaft
Exhaust
Back Plate
Mounting Lugs
Crankcase
Front Bearing
10