Betamotor EVO 4t Bedienungsanleitung PDF herunterladen (Seite 65)

ASSEM BLY

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the seat. Then insert the valve into the guide until it

is pressing against the seat, and rotate it on its axis.

When the valve is removed, the dye will be missing

on the contact area. The width of this contact area

must fall within certain limits:

Standard 1.15-1.40mm

Service limit 1.80mm

If the sealing area is outside the service limit, the

seat must be recut.

Recut the seat also if excessive roughness is visible,

or if there is damage due to impact.

Check the free length L0 of the inner and outer

valve springs. Change the springs if their free length

is below the minimum value:

Minimum L0 outer spring 38.6mm

(39mm when new)

Minimum L0 inner spring 31.5mm

(31.8mm when new)

Measure the compression strength of the valve

springs with a pressure dynamometer at length L1:

Outer spring: F=200±9N at L1=30mm

Inner spring: F=110±6N at L1=26.5mm

Using a suitable tester, check how well the valves

seal once the head is assembled.

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Betamotor EVO 4t Bedienungsanleitung Seite 65