SERVICE INFORMATION
SRM-265ES
7
2 CARBURETTOR ADJUSTMENT PROCEDURE
2-1 General adjusting rules
A. Before starting the unit for adjustment, check the following items.
1. The correct spark plug must be clean and properly gapped.
2. The air filter element must be clean and properly installed.
3. The muffler exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel filter are in good condition and clear of debris.
5. The fuel is fresh ( > 89 octane :
RON
) and properly mixed at 50 : 1 with “ISO L-EGD” or “JASO-FC/FD” 2-
stroke oil.
6. Remove shield from gear case, and install nylon line cutter if 3-tooth blade is installed. Extend nylon line
cutter and cut nylon line cutter lengths to 180 mm (7.0 inches) for proper engine loading to adjust carburettor
on both SRM-265ES(L) and SRM-265ES(U).
B. Start and run engine for 2
minutes alternating rpm between WOT and idle every 5 seconds. Adjust idle speed
to 2,900 +/- 200 r/min by turing idle adjust screw. If engine does not run correctly after this adjustment, proceed to
the next step 2-2.
IMPORTANT : After adjusting carburettor according to the steps 2-2 and 2-3, the limiter plug(s) must
be installed in idle and hi speed (H) mixture needle(s) hole(s) to comply with Emission Directive.
2-2 Presetting Idle mixture needle and hi speed (H) mixture needle
Parts Required : 2 limiter plugs P/N P005-001270
1. Remove the plugs from Idle mixture needle hole
(A) and hi speed mixture needle hole (B) using limiter
plug tool (C) as follows.
1) Put limiter plug tool (C) on limiter plug in mixture needle
hole.
2) Push and turn limiter plug tool anticlockwise 2 turns into
limiter plug slowly.
3) Pull out limiter plug tool with the limiter plug from mixture
needle hole.
NOTE :
If plug is damaged and stays in the hole,
use hand auger or pin-shaped tool to scrape, and
lift the cap pieces out of the hole.
2. Turn Idle mixture needle (D) clockwise completely until lightly seated. Then turn it anticlockwise 1 1/2 turns.
Turn hi speed mixture needle (G) clockwise until lightly seated. Then turn it anticlockwise 1 1/2 turns.
3. Turn idle adjust screw (E) anticlockwise until screw tip just touches throttle plate (F). Then turn it in
clockwise 3 1/4 turns.
NOTE :
Initial carburettor setting (Idle adjust screw, idle and hi speed mixture needles) shown here is to
start the engine after restoration or carburettor change. Idle adjust screw, idle and hi speed mixture needles
turn for designated engine revolution through procedures indicated here may vary. As long as idle and
WOT engine speed is set in given range, variance would be ignorable.
(A)
(A)
(E)
(F)
(D)
(B)
(G)
(C)
1)
2)
3)
