Name: Cylinder Head Kit Fits Honda GX340 GX390
Brand: Chongqing Power Equipment Co, LTD
SKU: ADA: HK1-390
Price: 98.95 USD
Availability: InStock

Cylinder Head Kit Fits Honda GX340 GX390

Description Shipping Options Torque Specs & Info Additional Info

Fits Honda Models:

GX340

GX390

Includes:

Cylinder Head Assembled with

Rocker Arms
Inlet and Exhaust Valves
Valve Springs
Retainer Clips
Spark Plug

Valve Cover Gasket

Cylinder Head Gasket

Carburetor Gaskets

Muffler Gasket

Carburetor Stud Mounting Bolts

Cylinder Head Bolts

Valve Cover Bolt

Carburetor Insulator

Engine Specifications
Model	GX390K1
Type	4-stroke, OHV, single cylinder, inclined by 25°
Displacement	389 cm ³ (23.7 cu·in)
Max. horsepower	13.0 HP (10.0 kW) at 3,600 rpm
Max. torque (crank PTO)	27 Nm (2.7 kg·m, 20.0 ft·lb) at 2,500 rpm
Carburetor	Horizontal type, butterfly valve
Cooling system	Forced-air
Ignition system	Transistorized magneto ignition
Lubricating system	Forced splash
Starting system	Recoil and Starter motor
Stoping system	Ignition primary circuit ground
Fuel used	Unleaded gasoline (octane number 86 or higher)
Fuel consumption	6.5 Liters (1.72 US gal, 1.43 Imp gal) / h
PTO shaft rotation	Counterclockwise (from PTO shaft side)

Honda GX390K1 (Type S)
Length, mm (in)	380 (15.0)
Width, mm (in)	450 (17.7)
Height, mm (in)	443 (17.4)
Dry weight, kg (lb)	31.0 (68.3)
Operating weight, kg (lb)	37.0 (81.6)

Cylinder block
Compression ratio:		8.0:1
Bore x Stroke		88 X 64 mm (3.5 x 2.5 in)
Sleeve internal diameter		88.000 mm (3.465 in)
Piston skirt outer diameter		87.985 mm (3.4640 mm)
Number of piston rings (compression / oil):		2 / 1
Ring side clearance	Top/second	0.030 – 0.060 (0.0012 – 0.0024)
Ring end gap	Top	0.20 – 0.40 mm (0.01 – 0.02 in)
	Second	0.20 – 0.40 mm (0.01 – 0.02 in)
	Oil (side rail)	0.20 – 0.70 mm (0.01 – 0.03 in)
Ring width	Top	2.0 mm (0.08 in)
	Second	2.0 mm (0.08 in)
Connecting rod small end I.D.		20.005 mm (0.7876 in)
Connecting rod big end I.D.		36.025 mm (1.4183 in)
Crankshaft outer diameter		35.985 mm (1.4167 in)
Cylinder Head
Warpage (limit)		0.10 mm (0.004 in)
Valve Arrangement:		OHV
Valves:		2
Stem outer diameter (standard):	INTAKE	6.590 mm (0.2594 in)
	EXHAUST	6.550 mm (0.2579 in)
Guide inner diameter:	INTAKE/EXHAUST	6.60 mm (0.6260 in)
Cam height:	INTAKE	32.40-32.80 mm (1.276-1.291 in)
	EXHAUST	31.89-32.29 mm (1.256-1.271 in)
Camshaft outer diameter:		15.984 mm (0.6293 in)

Tightening torque specs
Connecting rod bolt (M8x1.25 Special)	14 Nm; 1.4 kg·m; 10 ft·lb
Cylinder head bolt (M10x1.25)	35 Nm; 3.5 kg·m; 25 ft·lb
Flywheel nut (M16x1.5 Special)	115 Nm; 11.5 kg·m; 83 ft·lb
Rocker arm pivot lock nut (M6x0.5)	10 Nm; 1.0 kg·m; 7 ft·lb
Rocker arm pivot bolt (M8x1.25 Special)	24 Nm; 2.4 kg·m; 17 ft·lb
Crankcase cover bolt (M8x1.25)	24 Nm; 2.4 kg·m; 17 ft·lb
Oil level switch joint nut (M10x1.25)	10 Nm; 1.0 kg·m; 7 ft·lb
Fuel filter joint nut (M10x1.25)	2 Nm; 0.2 kg·m; 1.4 ft·lb
Muffler mounting nut (M8x1.25)	24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner wing nut (M6x1.0)	9 Nm; 0.9 kg·m; 6.5 ft·lb
Oil drain bolt (M12x1.5)	23 Nm; 2.3 kg·m; 17 ft·lb
Fuel tank bolt (M8x1.25)	24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner mounting nut (M6x1.0)	10 Nm; 1.0 kg·m; 7 ft·lb
Fuel strainer cup (M24x1.0)	4 Nm; 0.4 kg·m; 2.9 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)	24 Nm; 2.4 kg·m; 17 ft·lb
Bolt, nut (10 mm)	37.5 Nm; 3.75 kg·m; 27 ft·lb
Bolt, nut (12 mm)	55 Nm; 5.5 kg·m; 40 ft·lb

Engine
Maximum speed	3850 ± 150 rpm
Idle speed	1400 ± 150 rpm
Cylinder compression	6.0-8.5 kg/cm² (85-121 psi, 0.59 – 0.83 MPa) at 600 rpm
Valve clearance
Intake valve	0.15 ± 0.02 (0.006 ± 0.001)
Exhaust valve	0.20 ± 0.02 (0.008 ± 0.001)
Carburetor
Main jet	Externally vented carburetor bowl: #105 Internally vented carburetor bowl: #115
Float height	13.2 mm (0.52 in)
Pilot screw opening	Externally vented carburetor bowl: 2-1/2 Internally vented carburetor bowl: 3
Oil system
Oil type	Honda 4-stroke or an equivalent (SE or later)
Recommended oil	SAE 10W-30
Oil capacity	1.1 L (1.16 US gal, 0.97 lmp qt)
Ignition system
Ignition timing	B.T.D.C. 25° (Fixed)
Spark plug	NGK: BP6ES, BPR6ES DENSO: W20EP-U, W20EPR-U
Spark plug gap	0.7-0.8 mm (0.028-0.031 in)
Air gap	0.2-0.6 mm (0.01-0.02 in)
Starter motor
Brush length	7.0 mm (0.28 in) limit: 3.5 mm (0.14 in)
Mica depth	1.0 mm (0.04 in) limit: 0.2 (0.01)

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Cylinder Head Kit Fits Honda GX340 GX390

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