Yamaha TZR50 '03 Service Manual download pdf (Page 94)

ENG

INSPECTION AND REPAIR

4-15

Measuring warping and steps for sanding

the surface:

• Put a straightedge and a thickness gauge

on the cylinder head

• Measure the warpage

Outside specifications



Sand / Replace

• Place nº 400~600 wet sandpaper on the

surface and sand this down in a figure

eight shape.

NOTE

Turn the cylinder head round several times

so as not to take too much material off only

one side.

PISTON

1. Eliminate:

• Any carbon deposited (on the piston and

the ring slots)

2. Eliminate:

• Scratches and deposits found (on the

wall of the piston)

• Use nº 600~800 water sandpaper

NOTE:

Sand this in a cross shape and do not sand

excessively.

3. Inspect:

• The piston wall

• Wear / Scratching / damaged



Replace

Maximum cylinder head warpage:

0.03 mm

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Yamaha TZR50 '03 Service Manual Page 94