N.B.
THE TOOL FOR INSTALLING THE STOP RINGS MUST BE
USED MANUALLY.
CAUTION
USING A HAMMER MIGHT DAMAGE THE STOPS' HOUS-
ING.
Specific tooling
020454Y Tool for fitting piston pin stops (200 -
250)
Choosing the gasket
The shimming system allows the compression ra-
tio to be adjusted correctly.
Characteristic
Compression ratio
10.5 ÷ 11.5 : 1
Measurement "A" to be taken is a value of piston re-entry, it indicates by how much the plane formed
by the piston crown falls below the plane formed by the top of the cylinder. The further the piston travels
inside the cylinder, the thinner the washer "B" of the base gasket to be applied (to obtain the required
compression ratio) and vice versa.
N.B.
MEASUREMENT "A" MUST BE TAKEN WITHOUT ANY GASKET FITTED BETWEEN THE CRANK-
CASE AND CYLINDER AND AFTER RESETTING THE GAUGE, EQUIPPED WITH A SUPPORT, ON
A GROUND PLANE
ENGINE 250 SHIMMING
Name
Measure A Thickness
shimming 3.70 - 3.60 0.4 ± 0.05
shimming 3.60 - 3.40 0.6 ± 0.05
shimming 3.40 - 3.30 0.8 ± 0.05
Beverly Tourer 250 i.e. Engine
ENG - 129
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