Remove the spark plug, watch the color of spark
plug insulator cluster and determine the mixture ratio
of the combustible gas mixture in accordance with
the different abnormal appearances
Spark plug insulator cluster is white, the
exhaust muffler smokes or blast when the
engine is running at medium and low speed, the
accelerating ability is bad, idle speed is unstable
and tends to stop easily, relatively normal when
running at high speed.
spark plug insulator cluster is brown
Spark plug insulator cluster is
white, the engine is intermittent
when accelerating, carburetor
backfires and the engine power is
insufficient etc
combustible gas mixture is too strong
1. Check if the air cleaner blocks
2. Check if the carburetor starting
device (starting richer system)
works well
3. Check if the carburetor float is
too low
the mixture ratio of the
combustible gas mixture is proper
Check if the vent of
cylinder and exhaust
muffler block because
of too much carbon
combustible gas mixture is
too weak
Two-stroke engine
lubricating system
1. Check if the fuel
cock works well
2. Check if the
carburetor float is too
high
3. Check if the orifices
and pore canals on the
carburetor block
1. Check if the fuel in the
crankcase is insufficient
2. Check if the viscosity of fuel
in the crankcase is too low or the
fuel is too dirty
3. Check if the fuel filter blocks
4. Check if the fuel pump works
well
5. Check if the lubricating oil
path blocks
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