Honda TRX70 Fourtrax 1986 User Manual

SERVICE INFORMATION
TROUBLESHOOTING
CYLINDER REMOVAL
SERVICE INFORMATION
GENERAL
7-'
7-'
7 -2
7. CYLINDER/PISTON
PISTON REMOVAL
PISTON INSTALLATION
CYLINDER
INSTALLATION
7-2
7-5
7-5
• Cylinder/ piston maintenance and inspection can be performed with the engine installed.
•
Camshaft and rocke r arm lubricating oil is fed through cy linder oil passages. Be sure the passages are not clogged.
SPEC IFICATIONS
I TEM
STANDA RD
mmlinl
B
SE RVICE LIMIT
Cylinder 1.0.
47.005 - 47.015 11 .8506- 1 .8510) 47 . 05 (1.852)
Warpage across top
--
0.10 (0.004)
Taper --
0 . 10(0 . 004)
Out - af - round
--
0.10 (0.00 4)
Piston,
Piston ring- lo- ring
TOP 0.015-0.045 { 0.0006-0.00 18 ) 0. 12 (0.005)
piston groove clearance
SECOND
0.015 - 0.045 (0.0006-0.00 18 ) 0.12 (0.005)
rings
and piston
Ring end gap
TOP 0.15-0.3510.006-0.014) 0 .5 (0 .02)
pin
SECOND
0.' 5- 0.35 (0.006 - 0. 014) 0.5 (O .O2 )
OIL 0 .2 - 0 .5 (0.008-0.019) --
Pi ston 0.0 . 46.980 - 4 7.000 (1.8469-1.8504) 46 . 90 (1 . 847)
Piston pin bore 13 .002- 1 3.008 (0.5 119 -0.5 121 1 13.06 (0.5 14 )
Connecting rod small end 1.0.
13 .0 13 - 13 . 043 (0.5 1 23 - 0.5 1 35) 13 . 10 ( 0.5 16 )
Piston pin 0.0. 12.994 - 13.000 (0.5116 - 0.5 118 ) 12 . 98 (C.511)
Piston - lo - piston pin clearance
0 .002 - 0.014 (0.000 1- 0.0006) 0.075 (0.0030)
Cylinder - lo-piston clearance 0 . 005 - 0.035 (0.0002 - 0.001 4)
0 .
15 (0.0061
TORQUE VA LUE S
Cam chain guide roller bolt
Cylinder mount in g bo lt
7 - 13 N·m (0.7 - 1.3 kg -m, 5 - 9 ft-Ibl
10 - 14 N'm 1 1.0 - 1.4 kg - m. 7 - 10 ft -Ibl
TROUBLESHOOTING
Compression low
• Worn cylinder or piston rings
Excess ive smoke
Worn cylinder or piston rings
Improper installation of piston rings
Scored
or scratched piston or cylinder wall
Overheating
Excessive carbon build-up on the piston or co mbusti on
chamber
Knocking or abnormal noise
Worn piston and cy li nder
• excessive carbon build · up
7-1

Honda TRX70 Fourtrax 1986 Specifications

General

Brand	Honda
Model	TRX70 Fourtrax 1986
Category	Offroad Vehicle
Language	English