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SERVICE INFORMATION

HCA-2500

7

2  EMISSION ADJUSTMENT GUIDE

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” 2-
stroke oil.

6. The gear case assembly with blade set adjusted clearance properly must be installed for proper engine
loading.

B. Set L and H mixture needles with limiter caps anticlockwise to rich side stop.  Start and run engine for 2
minutes alternating engine speed between WOT and idle every 5 seconds. Adjust idle adjust screw to 2800
+/- 300 r/min. Adjust H mixture needle with limiter cap to 10000 +/- 500 r/min. If engine does not run correctly
after this adjustment, proceed to the next step (2-2).

C. After adjusting carburettor according to the steps 2-2 and 2-3, the limiter cap(s) must be installed on L
and/or H mixture needle(s) to comply with Emission Directive.

2-2 Presetting idle adjust screw, L mixture needle and H mixture needle

1. Remove cleaner lid. Turn the L and H mixture
needles anticlockwise  to rich side stop and meet
limiter caps tabs (A) with locating slot (B), using 3
mm blade screw driver.

NOTE : If cap tabs (A) misalign with locating slots
(B), there is a chance to strip thread.

2. Screw left hand thread of limiter cap tool 91019
into centre hoIe of limiter cap anticlockwise until tab
of the limiter cap just come out from locating slot.

NOTE : DO NOT COMPLETELY REMOVE
LIMITER CAP FROM CARBURETOR!   If the limiter
cap were pulled out completely, there is a chance
that the other mixture needle would turn and limiter
cap tab would misalign with locating slot when
screwing the limiter cap tool into centre hole of the
other limiter cap, and thread is stripped. When the
thread is stripped by limiter cap tool, screw 3 mm
wood screw in the stripped centre hole of the limiter
cap, and pull off the cap.

91019 

  (Continued)

H

L

(A)

(B)

(B)

(A)

Summary of Contents for HCA-2500

Page 1: ...sed on the latest products information available at the time of publication 1 CONTENTS page 1 SERVICE INFORMATION 2 1 1 Specification 2 1 2 Technical data 3 1 3 Torque limits 4 1 4 Special repairing m...

Page 2: ...Automatic rewind Rope diameter x length mm in 3 0 x 1000 0 12 x 39 4 Fuel Type Premixed two stroke fuel Mixture ratio 50 1 2 Petrol Minimum 89 octane petrol RON Two stroke air cooled engine oil ISO L...

Page 3: ...coil resistance 200 400 Secondary coil resistance k 1 3 1 8 Pole shoe air gaps mm in 0 30 0 40 0 012 0 016 Ignition timing at 3000 r min BTDC 29 at 8000 r min BTDC 28 at 9000 r min BTDC 12 Carburettor...

Page 4: ...ne Crankcase M 5 75 85 7 5 8 5 65 75 Cylinder M 5 75 85 7 5 8 5 65 75 Cylinder cover M 4 35 45 3 5 4 5 30 40 Muffler M 5 55 65 5 5 6 5 50 55 Top guard M 5 25 35 2 5 3 5 22 30 Regular bolt nut and scre...

Page 5: ...inder bore When plating is worn and aluminium can be seen B Piston outer diameter Min 33 91 1 335 C Piston pin bore Max 8 030 0 3161 D Piston ring groove Max 1 6 0 063 E Piston ring side clearance Max...

Page 6: ...Removing and installing piston pin Use 8 mm dia adapter 9 897705 11520 Bearing tool Removing and installing con rod small end needle bearing 10 897712 04630 2 pin wrench Removing and installing pawl c...

Page 7: ...roceed to the next step 2 2 C After adjusting carburettor according to the steps 2 2 and 2 3 the limiter cap s must be installed on L and or H mixture needle s to comply with Emission Directive 2 2 Pr...

Page 8: ...p tool 91019 into centre hole of previous limiter cap to pull out completely 5 Turn idle adjust screw anticlockwise and set the screw until the tip to just contact throttle plate Then turn idle adjust...

Page 9: ...ed in the range of 2 600 to 2 800 r min NOTE Engine speed must be allowed to stabilize a minimum of 20 seconds after each adjustment of L mixture needle to assure accurate tachometer readings 5 Turn H...

Page 10: ...on Directive 9 Start engine again and make sure engine runs at idle speed in the range of 2 400 to 3 200 r min and at WOT engine speed in the range of 9 000 to 10 500 r min Also make sure blade would...

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