Yamaha NEOS 50 YN50 (2002) [62/161] Inspection and repair

ENG

INSPECTION AND REPAIR

4-11

INSPECTION AND REPAIR

CYLINDER HEAD

1. Eliminate:

• Carbon deposits Use a rounded scraper



2. Inspect:

• Cylinder head warping.

Outside specified value



Rectify



Steps for measuring warping and rectifica-

tion:

• Join a straight edge  and a thickness cali-

bration  on the cylinder head

• Measure the limit of the warping

• If the warping is outside the specified value,

rectify the cylinder head

NOTE:

Turn the cylinder head several times to avoid

removing too much material from one side



CYLINDER AND PISTON

1. Eliminate:

• Carbon deposits Use a rounded file 

2. Inspect:

• Cylinder wall Wear/striping



Rectify or

change

3. Eliminate:

• Carbon deposits 

From the piston crown and ring grooves.

Warping limit

0.02 mm