Removing Valves; Checks; Valve Springs Free Length - APRILIA QUASAR 125 2003 Workshop Manual

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3.2.15 REMOVING VALVES

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Remove the head, see 3.2.13 (REMOVING THE HEAD).
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Use the special tool to compress valve springs.
To avoid valve wrong positioning after disassembly, mark intake and
exhaust valves.
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Remove intake valve guide oil seal.
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Remove exhaust valve guide oil seal.
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Thoroughly clean mating surfaces. Do not damage them.
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Thoroughly clean the combustion chamber. Remove any carbon deposits.
Take care not to score valve seats while cleaning these parts.

3.2.16 CHECKS

Check the combustion chamber for cracks or damage.
Using a scale, check that cylinder head bottom surface is perfectly flat. Take
measurements as shown in the figure, see 3.2.20 (CHECKING THE HEAD
AND CYLINDER).

3.2.17 VALVE SPRINGS FREE LENGTH

Measure springs length:
-inner spring 31.2 mm (1.228 in)
-outer spring 34.1 mm (1.342 in)
QUASAR 125-180
Release 00/2003 - 09