
-10-
• Idle adjust screw
Idle adjust screw
9. Checking and adjusting the carburetor ass’y
(1) Checking the Carburetor Ass'y WYC-36
[24](24)
/WYC-37
{25}<25>
/WYC-30
While disassembling the Carburetor Ass'y WYC-36
[24](24)
/WYC-37
{25}<25>
/WYC-30, check its parts
for wear, deformation, and clogged holes. If dirt or dust is found on a part, clean it off or remove dust by
using an air blower. If a deformed or worn part is found, replace the part or entire Carburetor Ass'y
WYC-36
[24](24)
/WYC-37
{25}<25>
/WYC-30.
(2) Adjusting the Carburetor Ass'y WYC-36
[24](24)
/WYC-37
{25}<25>
/WYC-30
Adjust the opening of the throttle valve during idling. Turning the idle adjust screw clockwise increases
engine speed; turning it counterclockwise reduces engine speed. If the cutting attachment rotates
during idling, reduce the speed so that the cutting attachment does not rotate. Note that excessively
low speed may cause the engine to stop during idling. In such case, increase the speed but do not
allow the cutting attachment to rotate.
10. Cleaning the spindle lock
(1) Disassembly
(a) Loosen the U-Nut (Left Hand) M10
[170](180){170}<180>
of the Gear Case Ass’y (4BB)
[160](170)
{160}<170>
, and then remove the Nut Cover
[169](179){169}<179>
, Cutter Holder (B)
[168](178)
{168}<178>
, and Cutter Holder (A)
[167](177){167}<177>
.
(b) Remove the press-fitted Cap
[163](173){163}<173>
, and then remove the Spring
[164](174){164}
<174>
and Lock Pin
[166](176){166}<176>
.
(2) Cleaning
(a) Thoroughly wipe off grease from the Lock Pin
[166](176){166}<176>
hole on the gear case and its
vicinity.
(b) Thoroughly wipe off grease from the Spring
[164](174){164}<174>
and Lock Pin
[166](176){166}
<176>
.
(c) Clean the groove (to be engaged with the Lock Pin
[166](176){166}<176>
) of Cutter Holder (A)
[167](177){167}<177>.
(3) Reassembly
(a) Apply grease to the Lock Pin
[166](176){166}<176>
and insert the pin into the gear case hole.
(b) Mount the Spring
[164](174){164}<174>
and press-fit the Cap
[163](173){163}<173>
to the Lock Pin
[166](176){166}<176>
. Be sure to use a new Cap
[163](173){163}<173>
.
(c) Push the Lock Pin
[166](176){166}<176>
and make sure that it returns to its home position.