Gx390 - Honda GX240RT2 Service And Repair Manual

SERVICE INFORMATION

GX390

Part
Engine Maximum speed (at no load)
Idle speed
Cylinder compression
Cylinder head Warpage
Cylinder Sleeve I.D.
Piston Skirt O.D.
Piston-to-cylinder clearance
Piston pin bore I.D.
Piston pin Pin O.D.
Piston pin-to-piston pin bore clearance
Piston rings Ring side clearance
Ring end gap
Ring width
Connecting rod Small end I.D.
Big end side clearance
Big end I.D.
Big end oil clearance
Crankshaft Crank pin O.D.
Crankshaft runout
Cylinder barrel Camshaft bearing I.D.
(Crankcase)
Crankcase cover Camshaft bearing I.D.
Valves Valve clearance
Valve stem O.D.
Valve guide I.D.
Guide-to-stem clear-
ance
Valve seat width
Valve spring free length
Valve spring perpendicularity
Camshaft Cam height
Camshaft O.D.
gx240ut2_gx270ut2_gx340ut2_gx390ut2
Item
3,850 ± 150 min
1,400 ± 150 min
0.51-0.69 MPa (5.2-7.0 kgf/cm
psi) / 600 min
88.000 – 88.017 (3.4646 – 3.4652)
87.975 – 87.985 (3.4635 – 3.4640)
0.015 – 0.042 (0.0006 – 0.0016)
20.002 – 20.008 (0.7875 – 0.7877)
19.994 – 20.000 (0.7872 – 0.7874)
0.002 – 0.014 (0.0001 – 0.0006)
Top 0.015 – 0.060 (0.0006 – 0.0024)
Second 0.030 – 0.060 (0.0012 – 0.0024)
Top 0.200 – 0.350 (0.0079 – 0.0138)
Second 0.350 – 0.500 (0.0138 – 0.0197)
Oil (side rail) 0.2 – 0.7 (0.01 – 0.03)
Top 1.160 – 1.190 (0.0457 – 0.047)
Second 1.160 – 1.175 (0.0457 – 0.0463)
20.005 – 20.020 (0.7876 – 0.7882)
0.1 – 0.4 (0.004 – 0.016)
36.025 – 36.039 (1.4183 – 1.4189)
0.040 – 0.064 (0.0016 – 0.0025)
35.975 – 35.985 (1.4163 – 1.4167)
16.000 – 16.018 (0.6299 – 0.6306)
16.000 – 16.018 (0.6299 – 0.6306)
IN 0.15 ± 0.02
EX 0.20 ± 0.02
IN 6.575 – 6.590 (0.2588 – 0.2594)
EX 6.535 – 6.550 (0.2572 – 0.2578)
IN/EX 6.600 – 6.615 (0.2598 – 0.2604)
IN 0.010 – 0.040 (0.0004 – 0.0016)
EX 0.050 – 0.080 (0.0020 – 0.0032)
1.0 – 1.2 (0.04 – 0.05)
39.0 (1.54)
IN 32.498 – 32.698 (1.2794 – 1.2873)
EX 31.985 – 32.185 (1.2592 – 1.2671)
15.966 – 15.984 (0.6286 – 0.6293)
Standard
-1
(rpm)
-1
(rpm)
2
, 74-100
-1
(rpm)
–
–
–
mm (in)
Service
limit
–
–
–
0.10 (0.004)
88.170
(3.4710)
87.85
(3.459)
0.12 (0.005)
20.042
(0.7891)
19.950
(0.7854)
0.08 (0.003)
0.15 (0.006)
0.15 (0.006)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.140
(0.0449)
1.140
(0.0449)
20.07
(0.790)
1.0 (0.04)
36.07
(1.420)
0.12 (0.005)
35.93
(1.415)
0.1 (0.003)
16.05
(0.632)
16.05
(0.632)
–
–
6.44 (0.254)
6.40 (0.252)
6.66 (0.262)
0.11 (0.004)
0.13 (0.005)
2.0 (0.08)
37.5 (1.48)
1.5° max.
32.198
(1.2676)
29.886
(1.1766)
15.92
(0.627)