Rato R80, Руководство по обслуживанию, Страница: 31 / 79

Part IV Disassembly and Maintenance
27

Pull the starter handle to release unburned gas out of the cylinder.
 Assemble spark plug cap.
 Turn the gasoline engine switch to the "ON" position.
 Ground the negative electrode (threaded part) of spark plug via the cylinder head cover,
pull the starter handle to observe the spark condition.
4-1-2 Underpower
Phenomenon Cause Remedy
When raising the
accelerator, the speed
increases slowly, and
the speed decreases
or the engine shuts
down in severe cases
Fuel
supply
system
There is air in oil way or the oil
way is blocked
Exhaust and dredge oil way
The main measuring hole is
improperly adjusted Adjust the main measuring hole
again.
Needle valve hole and main hole
are blocked in the carburetor
Clean, and blow through
Fuel tank switch is clogged Clean and replace damaged part
Carbon deposit in the muffler and
exhaust pipe
Clear carbon deposit
Blockage of air filter Clean filter element
Leakage of air intake pipe Repair or replace
Poor
compression
Wear of piston, cylinder and piston
ring
Replace worn parts
Air leakage of joint face between
the cylinder body and the cylinder
cover
Replace the cylinder pad
Valve clearance is too large (too
small)
Readjust
Valve seal is not tight. Repair
Compression pressure inspection
 Drain the fuel from the fuel tank.
 Loosen the fuel drain bolt of the carburetor to drain the gasoline.
 Remove the spark plug cap and the spark plug, and install the cylinder pressure gauge at
the spark plug hole.
 Pull the starter for several times and measure the compression pressure. (≥0.4MPa)