Zenoah G800BPU-1 - Manual (Page 4)

4
counterclockwise decreases the idling R.P.M
Low Speed Needle: This is the fuel adjust screw (not the air screw). Turning this needle
clockwise makes the mixture gas leaner and turning it counterclockwise
makes it richer.
High Speed Needle: Turning this needle clockwise makes the mixture gas leaner and
turning it counterclockwise richer. Set this needle at a position which is 1/8 ~
1/4 open from the maximum R.P.M. position while the airplane is on ground.
[ NOTE ]
1. Do not tighten the High and Low Speed needles too firmly.
2. Ensure the engine is fully warmed up before use. When the engine has just started and is
not fully warmed up there may be insufficient acceleration from low speed operation and
the engine may stop.
No specific break-in is required. The engine is gradually breaking in as it is used and the
output will increase also increased gradually.
This engine is used for power source for radio controlled airplane so you are strictly
requested to check engine and relative parts of airplane.
1) Daily check (before starting)
• Leakage, damage, crack
• Muffler fixing bolts (torque, crack)
• Propeller hub (transformation, fixing bolts/nut)
(P/N:2629-51410 or 2629-91510, 3544-11510 and 1100-43231)
• Rotor (transformation, play, airgap)
2) Every 25 hours check
• Spark plug (gap, cleaning)
• Cylinder (abrasion)
• Piston/Ring (abrasion)
• Bearing (Gritty)
According to the checks, replace any part if necessary.
The engine can be disassembled or reassembled without any specific difficulties, but be
careful of the following matters;
a. For disassembling, the special tools shown in the parts list are required in addition to the
general tools. Be sure to use a new gasket when the crankcase and cylinder have been
disassembled and reassembled.
b. Disassembling rotor
1. Disassemble the spring starter.
9. Servicing
8. Maintenance
7. Engine Break-in
Low Speed
Needle
High Speed
Needle
Idle Screw
H : 1
1
/ 4 ±
1
/ 4
L : 1
1
/ 8 ±
1
/ 4
Standard setting