Yamaha BWS CW50L Service Manual download pdf (Page 40)

I..o Ic-01 I..o°.-I

__ CYLINDER HEAD • Piston wall

1. Eliminate: Wear/Scratches/Damage --*Replace.

• Carbon deposits

Use a rounded scraper (_)

NOTE:

Take care to avoid damaging the spark plug

3o,ool threads. Do not use a sharp instrument. Avoid _ .J 3o7oo,J

scratching the aluminium.

__________o_ f._---- _, 6. Measura:

J 2. Inspect: • Piston to cylinder clearance

• Cylinder head warpage ..................................................... **

Out of specification --* Resurface, Piston to cylinder clearance measurement

•****************************************************** steps:

Warpage measurement and re-surfacement First step:

steps: Measure the cylinder bore "C"with a cylinder

Attach a straight edge C) and a thickness bore gauge.

gauge (_)to the cylinder head. NOTE:

Measure the warpage limit. _ ___- /I Measure the cylinder bore "C"in parallel to and

_o Warpage limit: _ at right angles to the crankshaft, Then, calculate

/ I t,e veraoeo,t,e ea ure ens

If the warpage is out of specification, resur-

face the cylinder head. P'_"X] Standard Wear limit

NOTE:. Cylinder 39.993~ 49.912mm 40.10 mm

Rotate the head several times to avoid removing

3 too much material from one side. 3o7oos Bore "C" (1.574~ 1.575in) (1.579in)

Taper _ 0,006 mm

CYLINDER AND PISTON "T" (0.0002in)

1. Eliminate: C=MaximumD

• Carbon deposits T = (Maximum D1,D3or Ds) -

Use a rounded scraper C) (Maximum D2,D4or Ds )

2. Inspect:

• Cylinder wall If out of specification, replace cylinder, pis-

Wear/Scratches --, Replace. ton and piston rings as a set.

3O4O01

Sand3"Eliminate:incrisscross Do not sand exces- r,l,2ndstep:

• Carbon deposits __ • Measure the piston skirt diameter"P" with a

Fromthe piston crown (_)and ring grooves 0. micrometer.

.;,, ,_:: 4. Remove: @ 5 mm (0.2 in) from the piston bottom edge.

• Score marks and lacquer deposits

From the sides of piston. _ Piston Size: I

Standard:

NOTE: 39.952 ~ 39.972 mm

a pattern. I (1.573 ~ 1.574 in)

3o7oo3 sively. 3o_oo6

4 - 11 4 - 12

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 106 107

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Yamaha BWS CW50L Service Manual Page 40

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