5
. CYLINDER/PISTON
7
BR & M2 250 ENGINE
Remove any gasket material from the crankcase
surface.
Install the piston, piston pin and a new piston pin
clip.
CYLINDER INSTALLATION
Install the dowel pins and a new cylinder gasket
on the crankcase.
Coat the cylinder bore, piston and piston rings
with clean engine oil.
Carefully lower the cylinder over the piston by
compressing the piston rings.
Install the cam chain guide.
Gasket
Cylinder
Dowel Pin
•
Be careful not to drop foreign matters into
the crankcase.
＊
•
Position the piston “IN” mark on the
intake valve side.
•
Place a clean shop towel in the crankcase
to keep the piston pin clip from falling into
the crankcase.
＊
•
Be careful not to damage or break the
piston rings.
•
The piston ring end gaps should not be
parallel with or at 90
°
to the piston pin.
＊
Piston
Piston Pin Clip
Piston Pin
Summary of Contents for Bug Rider BR-250
Page 1: ...BR 250 BR 250SS M2 250 SERVICE MANUAL Manufactured by PGO of Motive Power Industry Co Ltd...
Page 34: ...4 CYLINDER HEAD VALVES 1 BR M2 250 ENGINE SCHEMATIC DRAWING...
Page 46: ...5 CYLINDER PISTON 1 BR M2 250 ENGINE SCHEMATIC DRAWING...
Page 55: ...6 DRIVE AND DRIVEN PULLEYS KICK STARTER 1 BR M2 250 ENGINE SCHEMATIC DRAWING...
Page 71: ...7 FINAL REDUCTION 1 BR M2 250 ENGINE SCHEMATIC DRAWING...
Page 82: ...8 CARBURETOR BR M2 250 ENGINE...
Page 90: ...9 A C GENERATOR STARTER CLUTCH 1 BR M2 250 ENGINE SCHEMATIC DRAWING...
Page 97: ...10 CRANKCASE CRANKSHAFT 1 BR M2 250 ENGINE SCHEMATIC DRAWING...
Page 103: ...10 CRANKCASE CRANKSHAFT 7 BR M2 250 ENGINE Torque 7 8 11 8N m Cam Chain Tensioner Slipper Bolt...
Page 105: ...11 COOLING SYSTEM 1 BR M2 250 ENGINE SCHEMATIC DRAWING...
