4-12
ENG
;;
;
;
;
Piston
Feeler gauge
Cylinder
CHECKING THE ENGINE PARTS
●
Method to use a feeler gauge.
Feeler gauge
How to insert the piston and the feeler gauge
is as shown: The piston pin is inserted in
parallel with the crankshaft axis.
Optimum piston clearance is evaluated by
smoothness of drawing out the feeler gauge.
●
Calculate the piston-to -cylinder clearance with
following formula.
* Refer to the following sections for inspection
method: CHECKING THE CYLINDER and
CHECKING THE PISTON AND PISTON PIN.
CHECKING THE PISTON CLEARANCE
●
If out of specification, rebore or replace
cylinder, and replace piston and piston
rings as a set.
●
If the piston clearance is over specification,
rebore cylinder and replace piston with
oversized piston to meet the specification.
●
If piston is replaced with oversized piston,
piston ring should be replaced with the
equivalent oversized piston ring.
Standard piston-to-cylinder clearance
0.030〜0.035mm
PISTON
DIAMETER
PISTON
CLEARANCE
CYLINDER
BORE
−
＝
Piston size number
Piston ring size number
Piston diameter(mm)
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
52.00
52.05
52.10
52.15
52.20
52.25
52.30
52.35
52.40
52.45
52.50
52.55
CAUTION:
Summary of Contents for KT100SEC
Page 1: ...RACING KART OWNER S SERVICE MANUAL 7YP 28199 SE ...
Page 47: ...4 23 ENG ...
Page 59: ......
Page 60: ...PRINTED IN JAPAN E PRINTED ON RECYCLED PAPER YAMAHA MOTOR CO LTD ...
