Yamaha MBK YQ100 Service Manual download pdf (Page 87)

ENG

4-7

PISTON PIN AND PISTON REMOVAL

1. Remove:

• Piston pin clip 

NOTE:

Before removing the piston pin clip, cover the

crankcase with a clean rag so you will not

accidentally drop the clip into the crankcase.

2. Remove:

• Piston pin 

• Piston 

• Piston pin bearing 

Do not use a hammer to drive the piston

pin out.

CYLINDER HEAD INSPECTION

1. Eliminate:

• Carbon deposits

Use a rounded scrapper .

2. Inspect:

• Cylinder head warpage

Out of specification→Re-surface.

*****************************************************

Warpage measurement and resurfacement

steps:

•Attach a straight edge  and a thickness

gauge  on the cylinder head.

•Measure the warpage limit.

Warpage limit:

0.05 mm

•If the warpage is out of specification, reface

the cylinder head.

NOTE:

Rotate the head several times to avoid removing

too much material from one side.

******************************************************

CYLINDER HEAD, CYLINDER, PISTON

CAUTION:





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Yamaha MBK YQ100 Service Manual Page 87