Compression Ratio Version 250 - Derbi GP1 125-250 c.c. Workshop Manual

C
OMPRESSION RATIO VERSION
Characteristic

Compression ratio version 250

Rc: 10,5 ÷ 11,5
NOTE
MEASUREMENT (A) MUST BE TAKEN WITHOUT TRIM MOUNTED BETWEEN THE
CASING AND THE CYLINDER, AFTER HAVING PUT THE COMPARATOR TO ZERO,
WITH ITS SUPPORT, ON A FLAT PLANE.
N.B.
THE MEASURE «A» TO TAKE IS A PISTON PROTRUSION VALUE THAT INDICATES HOW MUCH THE PLANE
FORMED BY THE PISTON TOP PROTRUDES FROM THE PLANE FORMED BY THE TOP OF THE CYLINDER.
THE MORE THE PISTON PROTRUDES FROM THE CYLINDER, THE MORE THE BASE GASKET TO APPLY (TO
RECOVER THE COMPRESSION RATIO) AND VICE VERSA.
NAME
Shimming 250
Shimming 250
Shimming 250
115
250
SHIMMING 250
MEASURE A
÷
2,60 2,50
÷
2,50 2,30
÷
2,30 2,20
NOTE
MOUNT ACCORDING TO THE
MEASUREMENT (A) OBTAINED
THICKNESS
0,4 ±0,05
0,6 ± 0,05
0,8 ± 0,05