Honda GX610K1

Honda GX610 engineThe Honda GX610 is a 614 cc (37.5 cu-in) V-twin cylinder air-cooled four-stroke internal combustion small gasoline engine with horizontal shaft manufactured by Honda Motor Company for general-purpose applications, such as concrete saws, pressure washers, chipper and shredders, trenchers, generators, vibratory rollers, ride-on cement trowels, lawn tractors.

The Honda GX610 K1 engine has an OHV (overhead valve) design with 90° V-twin cylinders; horizontal type carburetor with butterfly valve; heavy-duty recoil and electric starter, or only electric starter and transistorized magneto ignition system.

The 90° V-twin OHV format featuring an advanced combustion chamber design and superior intake and exhaust efficiency combines the ordinarily opposed elements of good fuel economy and high power output at the highest possible levels. An advanced breather design and three-piece oil ring improve oil circulation efficiency for lower oil consumption. The result is excellent reliability plus reduced running and maintenance costs.

The cylinder bore is 77.0 mm (3.0 in) and the piston stroke is 66.0 mm (2.6 in), compression ratio rating is 8.3:1. The GX610K1 engine produced 18 HP (13.4 kW) of horsepower at 3,600 rpm and 43.1 N·m (4.39 kg·m, 31.7 ft·lb) of torque at 2,500 rpm.

General information

Engine Specifications
ModelGX610 K1
Type4-stroke, OHV, 90° V-twin
Displacement614 cm 3 (37.5 cu-in)
Max. horsepower18 HP (13.4 kW HP) at 3,600 rpm
Max. torque (crank PTO)43.1 N·m (4.39 kg·m, 31.7 ft·lb) at 2,500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemForced lubrication
Starting systemRecoil starter or Recoil and electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption230 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

GX610 QAF-Type
Length, mm (in)388 (15.3)
Width, mm (in)457 (18.0)
Height, mm (in)452 (17.8)
Dry weight, kg (lb)42.0 (92.6)
Operating weight, kg (lb)43.0 (94.8)

Cylinder Block and Head

Improved crankcase rigidity, extra-durable crankshaft, and optimized cam shape reduce mechanical noise and contribute to quieter, smoother continuous operation. The Honda GX610 equipped with high-strength sintered aluminum connecting rods to reduce weight in overlap areas and minimize vibration caused by the cylinder offset.

Cylinder block
Compression ratio:8.3:1
Bore x Stroke77 X 66 mm (3.0 x 2.6 in)
Sleeve internal diameter77.00 mm (3.03 in)
Piston skirt outer diameter76.985 mm (3.03 in)
Ring side clearanceTop/Second0.030-0.060 mm (0.0006-0.0018 in)
Ring end gapTop/Second0.20-0.40 mm (0.010-0.020 in)
Ring widthTop/Second1.990 mm (0.0783 in)
Connecting rod small end ID18.005 mm (0.7087 in)
Piston pin outer diameter18.000 mm (0.7087 in)
Crankpin diameter39.995 mm (1.5746 in)
Crankshaft journal diameter38.000 mm (1.4961 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Valves:4 (2 per cylinder)
Stem outer diameter (standard):INTAKE6.590 mm (0.2594 in)
EXHAUST6.550 mm (0.2579 in)
Valve spring free length:39.0 mm (1.54 in)
Valve lifter internal diameter:6.010 mm (0.2366 in)
Valve lifter shaft outer diameter:6.000 mm (0.2362 in)
Camshaft journal diameter:16.985 mm (0.6687 in)
Cam height:INTAKE29.865 mm (1.1758 in)
EXHAUST29.865 mm (1.1758 in)

Tightening torque specs

Tightening torque specs
Connecting rod bolt12 Nm; 1.2 kg·m; 9 ft·lb
Cylinder head bolt34 Nm; 3.5 kg·m; 25 ft·lb
Socket bolt27 Nm; 2.7 kg·m; 20 ft·lb
Flywheel nut196 Nm; 20.0 kg·m; 145 ft·lb
Pivot bolt24 Nm; 2.4 kg·m; 17 ft·lb
Pivot adjusting nut10 Nm; 1.0 kg·m; 7 ft·lb
Cylinder head cover bolt9 Nm; 0.9 kg·m; 6.5 ft·lb
Oil level switch joint nut10 Nm; 1.0 kg·m; 7 ft·lb
Oil drain bolt39 Nm; 4.0 kg·m; 29 ft·lb
Standard torque values
Bolt, nut (5 mm)5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Bolt, nut (6 mm)10 Nm; 1.0 kg·m; 7 ft·lb
Bolt, nut (8 mm)22 Nm; 2.2 kg·m; 16 ft·lb
Bolt, nut (10 mm)34 Nm; 3.5 kg·m; 25 ft·lb
Bolt, nut (12 mm)54 Nm; 5.5 kg·m; 40 ft·lb

Service Information

Engine
Maximum speed3,850 ± 100 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression6.0-8.0 kg/cm2 (85-114 psi) at 500 rpm
Valve clearance
Intake valve clearance0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance0.20±0.02 mm (0.008±0.001 in)
Oil system
Oil typeHonda 4-stroke or an equivalent (SG or SF)
Recommended oilSAE 10W-30
Oil capacity With oil filter: 1.80 L (1.90 US. qt, 1.58 Imp. qt.)
Without oil filter: 1.50 L (1.59 US. qt, 1.32 Imp. qt.)
Oil change intervalEvery 6 month or 100 Hrs.
Carburetor
Main jet#92
Float height14.0 mm (0.55 in)
Pilot screw opening1-7/8 turns out
Ignition system
Ignition timing20° B.T.D.C.
Spark plugNGK: ZGR5A
DENSO: J16CR-U
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Primary ignition coil resistance0.8-1.0 Ω
Secondary ignition coil resistance5.9-7.1 kΩ
Ignition coil air gap0.4 ± 0.2 (0.016 ± 0.008)
Starter motor
Brush length10.0 mm (0.43 in)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

1 Comment

  1. Dear gentlemen, I am trying to find a parts supplier for an Honda Engine GX610, 18HP gasoline in Miami, please could you help me out with a distributer in that area? And I would like to get a parts manual for this engine too. Best regards.

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