KEEWAY RKV125 Instruction And Maintenance Manual page 20

Electrodes of spark plug are wet.
Check overflow of carburetor
Yes
1. Check if there is
foreign substance
between needle valve
and valve seat of
carburetor float and it
cannot be closed; 2.
Check if the conical
surface of needle valve of
carburetor float is worn
into a step form; 3. Check
if the float is broken; 4.
Check if float is too low.
1.
external connection parts
of engine; 2.Check valve
timing;
tightness between valve
and valve seat; 4. Check
Remove if valve clearance is too
spark plug small; 5.Check if piston
and check.
ring is stuck inside the
ring groove or of less
elasticity; 6. Check wear
and tear of piston ring
and cylinder.
Drop a little gasoline into the cylinder for a trial start.
No
Check if air filter
is clogged.
Carburetor is
clogged inside or
float is too high.
Check leakage at
3. Check
Electrodes of spark plug are dry.
Engine stalls when it
runs a very short
time.
1. Check if breather on
the fuel tank cap is
clogged; 2. Check if
fuel filter and fuel
switch are clogged; 3.
Check if fuel switch
works normally; 4.
Check if oil intake of
carburetor is clogged;
5. Check if carburetor
float is too high.
Engine can
continue to run
when it is started.
Carburetor
starter (i.e.
cranking
enrichment
system) fails.