CYLINDER AND PISTON
5-30
b. If out of specification, replace the cylinder,
and replace the piston and piston rings as a
set.
c. Measure piston skirt diameter D “a” with the
micrometer.
d. If out of specification, replace the piston and
piston rings as a set.
e. Calculate the piston-to-cylinder clearance
with the following formula.
f. If out of specification, replace the cylinder,
and replace the piston and piston rings as a
set.
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EAS24430
CHECKING THE PISTON RINGS
1. Measure:
• Piston ring side clearance
Out of specification
→
Replace the piston
and piston rings as a set.
TIP
Before measuring the piston ring side clearance,
eliminate any carbon deposits from the piston
ring grooves and piston rings.
Bore
92.000–92.010 mm (3.6220–
3.6224 in)
(YFM5FGY/YFM5FGPY)
102.000–102.010 mm (4.0157–
4.0161 in)
(YFM7FGY/YFM7FGPY)
Wear limit
92.080 mm (3.6252 in)
(YFM5FGY/YFM5FGPY)
102.080 mm (4.0189 in)
(YFM7FGY/YFM7FGPY)
Taper limit
0.05 mm (0.002 in)
Out of round limit
0.05 mm (0.002 in)
“C” = maximum of D
1
–D
6
“T” = maximum of D
1
or D
2
- maximum of D
5
or D
6
“R” = maximum of D
1
, D
3
or D
5
- minimum of
D
2
, D
4
or D
6
Diameter D
91.955–91.970 mm (3.6203–
3.6209 in)
(YFM5FGY/YFM5FGPY)
101.955–101.970 mm (4.0140–
4.0146 in)
(YFM7FGY/YFM7FGPY)
b. 10 mm (0.39 in) from the bottom edge of the
piston
• Piston-to-cylinder clearance =
Cylinder bore “C” -
Piston skirt diameter “D”
Piston-to-cylinder clearance
0.030–0.055 mm (0.0012–0.0022
in)
Limit
0.10 mm (0.0039 in)
(YFM5FGY/YFM5FGPY)
0.13 mm (0.0051 in)
(YFM7FGY/YFM7FGPY)
Top ring
Ring side clearance
0.030–0.070 mm (0.0012–0.0028
in)
Limit
0.12 mm (0.0047 in)
2nd ring
Ring side clearance
0.020–0.060 mm (0.0008–0.0024
in) (YFM5FGY/YFM5FGPY)
0.030–0.070 mm (0.0012–0.0028
in) (YFM7FGY/YFM7FGPY)
Limit
0.12 mm (0.0047 in)
(YFM5FGY/YFM5FGPY)
0.13 mm (0.0051 in)
(YFM7FGY/YFM7FGPY)
Oil ring
Ring side clearance
0.04–0.13 mm (0.0016–0.0051 in)
(YFM5FGY/YFM5FGPY)
0.060–0.150 mm (0.0024–0.0059
in) (YFM7FGY/YFM7FGPY)
techsparkstudio.com
Summary of Contents for Grizzly550
Page 1: ......
Page 4: ......
Page 6: ......
Page 11: ...FEATURES 1 4 techsparkstudio com ...
Page 55: ...LUBRICATION POINTS AND LUBRICANT TYPES 2 26 techsparkstudio com ...
Page 58: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 29 1 2 3 4 5 ...
Page 60: ...COOLING SYSTEM DIAGRAMS 2 31 EAS20420 COOLING SYSTEM DIAGRAMS 1 2 3 8 7 6 5 4 ...
Page 68: ...CABLE ROUTING 2 39 A A B B C C A A B B C C A C D E E F B 1 1 2 2 3 3 3 4 5 5 6 6 7 8 ...
Page 74: ...CABLE ROUTING 2 45 A C D B B B B E E B B E E C D A 1 2 2 2 3 3 A B B C C D E E F 4 4 4 ...
Page 76: ...CABLE ROUTING 2 47 ...
Page 79: ...techsparkstudio com ...
Page 116: ...ELECTRICAL SYSTEM 3 37 ...
Page 119: ...techsparkstudio com ...
Page 136: ...FRONT WHEELS 4 17 ...
Page 188: ...REAR ARMS AND REAR SHOCK ABSORBER ASSEMBLIES 4 69 7 6 7 6 4 3 5 2 8 8 1 ...
Page 230: ...AC MAGNETO AND STARTER CLUTCH 5 39 1 ...
Page 246: ...PRIMARY AND SECONDARY SHEAVES 5 55 ...
Page 292: ...WATER PUMP 6 11 ...
Page 302: ...THROTTLE BODY 7 9 ...
Page 334: ...REAR CONSTANT VELOCITY SHAFT ASSEMBLIES FINAL DRIVE ASSEMBLY AND REAR DRIVE SHAFT 8 31 ...
Page 337: ...techsparkstudio com ...
Page 351: ...CHARGING SYSTEM 9 14 techsparkstudio com ...
Page 355: ...LIGHTING SYSTEM 9 18 techsparkstudio com ...
Page 363: ...SIGNALING SYSTEM 9 26 techsparkstudio com ...
Page 391: ...FUEL INJECTION SYSTEM 9 54 techsparkstudio com ...
Page 395: ...FUEL PUMP SYSTEM 9 58 techsparkstudio com ...
Page 411: ...EPS ELECTRIC POWER STEERING SYSTEM for YFM5FGP YFM7FGP 9 74 techsparkstudio com ...
Page 414: ...ELECTRICAL COMPONENTS 9 77 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ...
Page 436: ...ELECTRICAL COMPONENTS 9 99 ...