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RedMax GZ25N, Workshop Manual, Page: 1 / 25

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RedMax GZ25N Workshop Manual Download Page 1

STRATO CHARGED ENGINE

GZ25N

R

Workshop Manual

July 2000

S4810-0006

Applicable Model Name:

1. Brushcutters BCZ2500S/BCZ2500SU
2. Long Reach Trimmer LRTZ2500
3. Short Reach Trimmer SRTZ2500
4. Pole Saw PSZ2500
5. Reciprocator SGCZ2500S
6. Sweeper RMSZ2500
7. Hand Held Edger HEZ2500S
8. Split Boom Trimmer : EXZ2500S

Summary of Contents for GZ25N

Page 1: ...000 S4810 0006 Applicable Model Name 1 Brushcutters BCZ2500S BCZ2500SU 2 Long Reach Trimmer LRTZ2500 3 Short Reach Trimmer SRTZ2500 4 Pole Saw PSZ2500 5 Reciprocator SGCZ2500S 6 Sweeper RMSZ2500 7 Han...

Page 2: ...ssembling of lgnition Coil 12 6 7 Installing of Spark Plug 12 6 8 Laying of Switch Cable 13 6 9 Fitting of Plug Cap 13 6 10 Removing Piston Pin 13 6 11 Installing of Piston 14 6 12 Assembling of Pisto...

Page 3: ...tional 2 stroke engine level By optimizing the combustion chamber design ignition plug position and ignition timing lean burn operation became possible By combining with the stratified lead air scaven...

Page 4: ...during the piston upstroke intake stroke to the top dead centre air fuel mixture is charged to the crankcase and lead air is charged to the scavenging ports though the reed valves As piston proceeds t...

Page 5: ...igned for the Strato charged Engine Spark Plug Cylinder Reed Valve Reed Valve Carburetor Lead Air Intake Tube Lead Air Intake Tube Insulator Brushcutters BCZ2500S BCZ2500SU Long Reach Trimmer LRTZ2500...

Page 6: ...h automatic timing advance system Ignition Timing rpm 35 7000 Spark Plug NGK CMR7A Stopping Method Primary coil short circuiting Cooling System Forced Air Cooling Air Cleaner Dry Type Output Axle Rota...

Page 7: ...Fuel Cap Air Cleane Carburetor Plug Cap Recoil Starter Fan Cover Fan Cover 122 4 80 223 8 78 168 6 61 238 9 36 271 10 67 85 3 35 7 85 0 31 155 6 10 188 7 40 113 4 45 248 9 76 113 4 45 248 9 76 GZ25N f...

Page 8: ...ometer Piston Pin Diameter mm in 8 0 315 7 98 0 314 Micrometer No stepwear is allowed Connecting Rod Small End Bore mm in 11 0 433 11 05 0 435 Cylinder Gauge Clearance between Small End Piston 0 0 021...

Page 9: ...ding portion Grease of screw Clutch AREA MATERIAL TO BE APPLIED Oil seal lip Grease Piston sliding area 2 cycle oil Main bearing 2 cycle oil Piston pin bearing 2 cycle oil Crank pin bearing 2 cycle oi...

Page 10: ...ng assembling clutch and rotor 2 Piston Stopper 4810 96220 1 Puller Assy 2890 96100 To remove rotor 8 Drum Remover 5500 96120 To remove clutch drum 9 Snap Ring Guide 5500 96130 To install clutch drum...

Page 11: ...and oil seals as they can be damaged easily Be especially careful not to lose parts that have been removed Arrange the removed parts in a pattern that approximates their actual position to prevent lo...

Page 12: ...ex Remove the rotor nut 12mm Hex Remove the rotor using the puller assy 2890 96100 Apply 8mm puller bolts 6 3 Mounting of Clutch Shoe 6 4 Removing of Rotor Apply grease into the holes on the clutch sh...

Page 13: ...0 96220 to the plug hole Engage the puller 4500 96100 to 2 holes on the pulley and pull out the pulley Note Pulley screw is right turn screw 6 5 Removing Recoil Pulley Pulley Puller Wrench Ignition co...

Page 14: ...y Caution Check that the plug cap is not deteriorated stiffened nor has cracks Also check that there is no play after fitting the cap 6 10 Removing Piston Pin Remove snap rings from both sides of the...

Page 15: ...clip Fit the circlip in the groove so as to face the end gap below Exhaust side Allow mark Piston Circlip End Gap 6 13 Direction of Setting Cylinder Gasket Set an arrow mark punched out on the cylinde...

Page 16: ...g of either F or S S is for the starter end and F for the fan end Assembling position shall not be mixed up Caution Oppositely assembled tubes will cause a sealing failure Before assembling the tubes...

Page 17: ...0 008in or the valve is distorted Screw lock agent shall be applied to the reed valve and the stopper fixing screw The reed valve case has a marking either S or F S is for the starter side and F for t...

Page 18: ...and the snap ring push guide 5500 96140 After the assembly apply molybdenum grease on the clutch drum spline 6 19 Assembling Cluch Drum 1 Assembling Snap Ring Snap Ring Push Guide Clutch Drum Snap Ri...

Page 19: ...alve outside diameters differ each other As the venturi bore sizes also differ each other air intake timing can be changed by rotation of the rotary valves Intake timing for the air fuel mixture and t...

Page 20: ...ation Main Jet 38 5 Metering Lever Height mm in 1 5 0 16 0 059 0 006 Venturi Bore mm in MIX 9 0 0 354 AIR 8 0 0 315 Choke Bore mm in 13 2 0 5210 Valve Opening Pressure kg cm 2 psi 1 0 2 0 14 2 28 4 Va...

Page 21: ...by blowing and open by sucking the valve has no failure In case of failure soak the valve into gasoline for about 10 minutes and repeat blowing and sucking several times If this is not successful exch...

Page 22: ...adjust or exchange 4 Clogging of air cleaner Wash with mixed gasoline 5 Faulty fuel Change with proper fuel Fueling normal but 1 Worn out cylinder piston or piston ring Exchange 2 Gas leakage from cyl...

Page 23: ...or tightening or carburetor joint screws 3 Water in fuel Change with good fuel 4 Piston start to seizure Filing of seized surface with fine files 5 Muffler choked with carbon Cleaning 6 Crack on lead...

Page 24: ...23 STRATO CHARGED ENGINEGZ25N...

Page 25: ...R KOMATSU ZENOAH AMERICA INC 4344 Shackleford Road Suite 500 Norcross Georgia 30093...

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