8. PISTON/CYLINDER
SERVICE INFORMATION 8-1
INVESTIGATION OF FAULTS 8-2
DISMANTLING THE CYLINDER 8-3
DISMANTLING THE PISTON 8-4
INSTALLING THE PISTON 8-6
INSTALLING THE CYLINDER 8-8
CBX250
SERVICE INFORMATION
GENERAL INSTRUCTIONS
•Before services of repair in the cylinder / piston remove the engine.
•Be careful not to damage the cylinder wall and the piston.
•When using a screwdriver to remove the cylinder, be careful not to damage the contact surfaces.
•To remove the piston clean the deposits of carbon and mud in the upper part of the cylinder. .
•During the disassembly, identify and save each piece removed after reinstallation in its original position.
SPECIFICATIONS
Unit: mm
Item Value Service Limit
Cylinder D.I. 73,000 – 73,010 73,11
Ovalización — 0,05
Conicidad — 0,05
Alabeo — 0,05
Piston, cotter pin, Mark of leadership of piston Marca “IN” oriented toward the
—
and piston
side of intake
rings
D.E. of the piston 72,950 – 72,970 72,87
Measuring Point of D. E. piston 16 mm From the bottom —
D. I. the hole in the cotter pin 17,002 – 17,008 17,05
D. E. of cotter pin 16,994 – 17,000 16,97
D. I. the foot of the crank 17,016 – 17,034 17,06
Slack between the cylinder and the piston 0,030 – 0,060 0,23
Slack between the piston and the cotter pin 0,002 – 0,014 0,07
Slack between the crank and the cotter pin 0,016 – 0,040 0,09
Slack between the rings and Superior 0,015 – 0,050 0,12
the slot
Secondary 0,015 – 0,050 0,12
Opening of the extremities Superior 0,15 – 0,30 0,30
of the rings
Secondary 0,30 – 0,45 0,45
Anel oil
ring (side ) 0,20 – 0,70 0,86
Marca de direction del Superior/
Mark oriented toward top
—
Ring del piston
Secondary
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