PGO BR-150 Bug Rider, Service Manual

Page: 59 / 72

7
Engine inspection
•
Pulse air
system
•
Keep the air-in
path clean.
•
Keep the
vacuum pipe
well connected
to intake
manifold,
•
Never jam the
vacuum pipe.
Part name /description
Sta nda rd
( mm )
L im it
( mm )
Cy lin de rh ead
flatness
Cy lin der
Bo re 5 7 .4 9 0~5 7 .5 1 0 5 7 .6 0 0
Cur ve
- 0 .0 5
Cy lindrili ty
- 0 .0 5
Ro undness
- 0 .0 5
Piston/
Pis ton ring
Cl eara nce b/w Pisto n and
Pis ton ring
lst r ing
0 .1 0
2
nd
rin g
0 .1 0
Cle ar an ce o f cu ttin g
sect ion
lst r ing
0 .5 0
2
nd
rin g
0 .5 0
---
Piston outer dia meter
5 7 .4 7 5~5 7 .4 9 0 5 7 .4 0 0
Mea suring lo cat ion of p isto n o ut er dia . 5 mm fro m the lo wer en d o f skirt
Cl ear ance b/w pi sto n and cyli nder
0 .0 2 5 ~0 .0 3 5 0 .1 0
Piston pin hole inner dia
1 5 .0 0 6~1 5 .0 1 2 1 5 .0 3 0
Pisto n p in ho le inn er di ameter
1 4 .9 9 0~1 4 .9 9 2 1 2 .9 6
Pisto n p in ou ter d iamet er 0 .0 2 0 ~0 .0 1 7 0 .0 2 5
Cl eara nce between pi st on and pi ston p in
1 5 .0 1 0~1 5 .0 2 8 1 5 .0 6 0
Co nn ecti ng ro d smal l en d i nn er dia
Cylinder & piston inspection data: