KYMCO agility R16 150 Service Manual

8. CYLINDER/PISTON
8-1
AGILITY CITY 125
SERVICE INFORMATION
GENERAL INSTRUCTIONS
xThe cylinder and piston can be serviced with the engine installed in the frame.
xAfter disassembly, clean the removed parts and dry them with compressed air before inspection.
SPECIFICATIONS
Ite
m
Standard
(
mm
)
Service Limit
(
mm
)
I.D. 52.4Д52.410 52.50
Warpage  0.05
Cylindricity  0.05
True roundness  0.05
Rin
g
-to-
g
roove
Top 0.015Д0.055 0.09
clearance
Second 0.015Д0.055 0.09
Top 0.10Д0.25 0.5
Piston,
Ring end gap Second 0.10Д0.25 0.5
piston rin
g
Oil side rail 0.2Д0.7 
Piston O.D. 52.370Д52.390 52.3
Piston O.D. measuring position 9mm from bottom of skirt 
. Piston-to-cylinder clearance 0.010Д0.040 0.1
Piston pin hole I.D. 15.002Д15.008 15.04
Piston pin O.D 14.994Д15.000 14.96
Piston-to-piston pin clearance 0.002Д0.014 0.02
Connecting rod small end I.D. bore 15.016Д15.034 15.06
TROUBLESHOOTING
xWhen hard starting or poor performance at low speed occurs, check the crankcase breather for
white smoke. If white smoke is found, it means that the piston rings are worn, stuck or broken.
Compression too low or uneven
compression Excessive smoke from exhaust muffler
xWorn, stuck or broken piston rings x Worn or damaged piston rings
xWorn or damaged cylinder and piston x Worn or damaged cylinder and piston
Compression too high Abnormal noisy piston
xExcessive carbon build-up in combustion x Worn cylinder, piston and piston rings
chamber or on piston head
x Worn piston pin hole and piston pin
SERVICE INFORMATION.......................8-1 PISTON REMOVAL.................................8-2
TROUBLESHOOTING..............................8-1 PISTON INSTALLATION........................8-6
CYLINDER REMOVAL ...........................8-2 CYLINDER INSTALLATION .................8-6
Cylinde
r
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KYMCO agility R16 150 Specifications

General

Brand	KYMCO
Model	agility R16 150
Category	Scooter
Language	English