-23-
Confirmation after reassembly
Location
Q’ty
Part name
Tightening torque
Shaft
Joint Case
(169)<169>
1
Hex. Socket Hd. Bolt M5 x 12
(154)<154>
4.0 to 7.0 N•m
{41 to 71 kgf•cm}
1
Hex. Socket Hd. Bolt
(W/Button) M6
(156)<156>
6.0 to 9.0 N•m
{61 to 92 kgf•cm}
Hanger
[187](166){187}<166>
1
M5 hex. screw
3.0 to 4.0 N•m
{31 to 41 kgf•cm}
Throttle Lever (B)
[151]{151}
1
M5 screw
2.0 to 3.0 N•m
{20 to 31 kgf•cm}
2
P tite screw
1.3 to 1.7 N•m
{13 to 17 kgf•cm}
Throttle Lever (A) Ass’y
[99](99){99}<99>
1
M5 screw
1.5 to 2.0 N•m
{15 to 20 kgf•cm}
4
P tite screw
1.3 to 2.0 N•m
{13 to 20 kgf•cm}
Handle Holder (C)
[158]{158}
2
Hex. Hole Button Screw
6 x 25S
[159]{159}
4.0 to 7.0 N•m
{41 to 71 kgf•cm}
Other Throttle
wire
1
M6
nut
1.0 to 3.0 N•m
{10 to 31 kgf•cm}
1. Check the following before starting the engine.
(1) Confirm that all fastening screws, bolts and nuts are properly tightened.
(2) Confirm that there is no gas leaking from any part of the engine section.
(3) Confirm that the crank shaft rotates and there is compression when pulling the starter handle.
(4) Perform priming ten times and then confirm that the priming pump is full of fuel.
2. Check the following after starting the engine.
(1) Confirm that the engine starts up by following the procedure below.
(a) Set the stop switch to the startup position.
(b) Perform priming ten times.
(c) Set the choke lever to the CLOSED position (
).
(d) Pull the starter handle and check for initial ignition. (As a guide, pull the handle 3 to 5 times at
ambient temperature of 20°C. Pull the handle more at lower temperatures.)
(e) Set the choke lever to the RUN position (
).
(f) Pull the starter handle to start the engine. (As a guide, pull the handle 2 or 3 times at ambient
temperature of 20°C. Pull the handle more at lower temperatures.)
(2) Confirm that each moving part functions properly, and that rotating parts make no abnormal noise.
(3) Check the speed as follows and adjust the carburetor according to “2. Checking and adjusting the
carburetor ass’y” on page 10.
(a) Speed at full throttle for up to 30 seconds after idling for 30 seconds
• When attaching the cutter blade: 8,500 to 12,500 min
-1
• When attaching the nylon cord: 8,200 min
-1
or higher (projecting part of nylon cord: 170 mm)
(b) Idling speed (Increase the speed to 6,000 to 8,000 min
-1
prior to measurement.)
The idling speed should be stable for at least 10 seconds at 2,500 to 3,500 min
-1
. Make sure the
cutting attachment does not rotate.
(c) Clutch-in speed (at which the cutting attachment starts to rotate): 3,800 to 4,800 min
-1
(4) Make sure that the engine accelerates smoothly.
(5) Release the throttle lever and make sure that the engine idles.
(6) Let the engine idle, and then rapidly accelerate and decelerate the engine. Make sure that the engine
does not stop.
(7) Confirm that the stop switch functions properly.