Derbi Rambla 250 Manual page 114

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Engine
AP8140920 Tool for pin rings
Choosing the gasket
Characteristic
Compression ratio 250 version
CR: 10.5 ÷ 11.5 : 1
NOTE
DISTANCE «A» TO BE MEASURED IS A VALUE OF PISTON RECESS, IT INDICATES BY HOW
DEEP THE PISTON CROWN FALLS BELOW THE PLANE FORMED BY THE CYLINDER CROWN.
THE FURTHER THE PISTON ENTERS INTO THE CYLINDER, THE THINNER THE BASE GASKET
TO BE USED SHOULD BE (TO COMPENSATE THE COMPRESSION RATIO) AND VICE VERSA.
Name
Shimming
Shimming
Shimming
ENG - 114
SHIMMING FOR 250 ENGINES
Measure A
3.70 - 3.60
3.60 - 3.40
3.40 - 3.30
Thickness
0.4 ± 0.05
0.6 ± 0.05
0.8 ± 0.05

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