SERVICE INFORMATIONSRM-510ES 7
2 CARBURETTOR ADJUSTMENT PROCEDURE
2-1 General adjusting rules
A. Before 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. Install nylon line cutter with 2 nylon lines (225 mm) properly cut without shield, even if 3-tooth blade is
installed, for proper engine loading to adjust carburettor on both SRM-510ES(L) and SRM-510ES(U).
B.
Adjustment with limiter plugs on carburettor.
Start and run engine for 10 seconds at idle, and for 2 minutes alternating engine speed between WOT for
20 seconds and Idle for 10 seconds. Adjust idle engine speed to 2,800 +/- 200 r/min by turning Idle adjust
screw. Adjust nylon line length to be WOT engine speed within
8,000 +/- 500 r/min (10,000 +/- 500 r/min with
shield). 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 mixture needle(s) hole(s) to comply with Emission Directive.
2-2 Presetting Idle adjust screw, Idle mixture needle and Hi speed mixture needle
Tools Required : Small screwdriver with 2.5 mm
blade, electronic tachometer P/N G310-000050, lim-
iter cap tool with 2.5 mm left-hand thread P/N 91020.
Parts Required : (2) limiter plug P/N A259-000000
1. Remove plugs from Idle mixture needle hole (A)
and H mixture needle hole (B) using limiter plug
tool (C) as follows.
(1)Put limiter plug tool (C) on limiter plug in mixture nee-
dle hole.
(2)Screw limiter plug tool anticlockwise 2 turns into lim-
iter plug pushing the tool against the plug to engage tool
threads.
(3)Pull limiter plug tool, with the limiter plug, from mixture
needle hole.
(4)Repeat plug removal procedure for remaining mixture
needle.
NOTE : If the plug is difficult to remove, use a
needle or pin to completely remove plug.
2. Turn Idle mixture needle (D) anticlockwise to
fully come out until clicking sound is heard. Then
turn it clockwise 13 turns. Turn Hi speed mixture
needle (G) clockwise until lightly seated. Then turn
it anticlockwise 3 3/4 turns.
3. Turn Idle adjust screw (E) anticlockwise until screw tip just touches throttle plate (F). Then turn it in
clockwise 1 1/2 turns.
NOTE : The initial carburettor settings for Idle adjust screw, Idle and Hi speed mixture needles are intend-
ed to start and run the engine before final carburettor adjustments are made to conform the unit to meet
Emission Directive are made. The actual number of turns needed for engine operation may vary.
(3)(2)(1)
(C)
(A)
(E)
(B)
