Inspecting The Timing System Components; Inspecting The Valve Sealings; Inspecting The Valve Housings - PIAGGIO Fly 150 4T Workshop Manual

Engine

Inspecting the timing system components

- Check that the guide shoe and the tensioner shoe
are not worn out.
- Ensure that the camshaft drive pulley, the chain
assembly and the sprocket wheel are not worn.
- If sings of wear are found, replace the parts. if the
chain, pinion or pulley are worn, replace the whole
assembly.
- Remove the central screw and the tensioner
spring. Check that the one-way mechanism is not
worn.
- Check the condition of the tensioner spring.
- If examples of wear are found, replace the whole
assembly.

Inspecting the valve sealings

- Measure the width of the sealing surface on the valve seats.
Specification
Inlet valve - seal surface
Outlet valve - seal surface

Inspecting the valve housings

- Remove any carbon formation from the valve guides.
- Measure the inside diameter of each valve guide.
- Take the measurement at three different heights in the rocker arm push direction.
ENG - 114
VALVE SEAL SURFACE
Fly 125 - 150 4T
Desc./Quantity
2.4 ÷ 2.8 mm
2.2 ÷ 2.6 mm