SERVICE INFORMATION
SRM-265ES
8
2-3 Adjusting carburettor
1. Start and warm up engine alternating engine
speed between WOT and idle every 5 seconds for
1 minute.
2. Adjust idle mixture needle (D) to reach maximum
idle speed with 2.5 mm blade screwdriver.
3. Set idle speed to 3,700 r/min by turning idle adjust
screw (E). Engine speed should be stable at 3,700
+/- 50 r/min.
4. Turn idle mixture needle anticlockwise to reduce
engine idle speed 800 r/min to set idle speed at
2,900 r/min. The idle speed range is 2,800 - 3,000
r/min.
NOTE : Engine speed must be allowed to stabilize
a minimum of 20 seconds after each adjustment of
idle mixture needle to assure accurate tachometer
readings.
5. Adjust hi speed mixture needle (G) to reach
maximum WOT engine speed. Then turn hi speed
mixture needle anticlockwise to reduce WOT engine
speed 10 r/min (max. approx. 8,500 r/min).
6. SRM-265ES(L) : Reinstall shield with cutting knife.
Cut nylon line cutter lengths to 152 mm to match
nylon line cutter reach to shield cut knife. Start
engine again and verify engine idle speed ranges
from 2,700 to 3,100 r/min, and WOT engine speed
ranges from 9,400 to 10,400 r/min.
SRM-265ES(U) : Reinstall shield for 3-tooth
blade(230 mm). Start engine and verify engine idle
speed ranges from 2,700 to 3,100 r/min, and WOT
engine speed ranges from 10,200 to 11,200 r/min.
Make sure the nylon line cutter/3-tooth blade(230
mm) does not rotate when engine is idle,and engine
should accelerate smoothly.
7. After adjusting carburettor, insert and secure new
plug(s) (J) P005-001270 deep in the needle holes
per the Emission Directive using limiter plug tool (H).
NOTE :
Engine WOT, and idle speed in field
operation may vary from final adjustment
specifications due to changing ambient conditions,
fuel, and engine loads. Safe engine speed variances
should be within the WOT and Idle speed ranges
listed in Section 1-1, otherwise the carburettor
should be readjusted.
(C)
(J)
(J)
(E)
(D)
(G)
(E)
