Service manual

Raider Mini 90 (single/double-seat): Service Manual Version：2.0 Feb. 2006
21
3 ENGINE
3.1
ENGINE COMBUSTION SYSTEM
3.1.1 Troubleshooting
LOW
COMPRESSION
HIGH
COMPRESSION
EXCESSIVE
NOISE
EXCESSIVE
SMOKE
OVERHEATING
z CYLINDER HEAD
z LEAKAGE OR DAMAGE OF HEAD GASKET
z WARPED OR CRACKED CYLINDER HEAD
z WORN-OUT CYLINDER OR PISTON RINGS
z EXCESSIVE CARBON ACCUMULATION ON PISTON HEAD OR
IN COMBUSTION CHAMBER
z WORN OUT PISTON AND CYLINDER
z EXCESSIVE CARBON ACCUMULATION
z WORN OUT CYLINDER OR PISTON RINGS
z IMPROPER INSTALLATION OF PISTON RINGS
z SCORED OR CRATCHED PISTON OR CYLINDER WALL
z EXCESSIVE CARBON ACCUMULATION ON PISTON OR IN
COMBUSTION CHAMBER
z BLOCKAGE OF AIR TO THE ENGINE COOLING SYSTEM
(FAN, CYLINDER COVER…)
z IMPROPER OIL SUPPLY
z INCORRECT IGNITION TIMING
3.1.2 Cylinder and Piston Removal
a) Remove the engine;
Disassemble the air cleaner and carburetor;
Remove the intake pipe mounting bolts;
Remove the cylinder head cover;
Bolt
Cylinder head nut
Cylinder head