Spark Plug Diagnosis - Air Conception REVOLUTION 200 Instruction Manual

Attention: Evaluating the state of the spark plug is the only one way of
checking whether the mixture's composition is correct!
Second stage: If the spark plug has dark colour or is black after the test flight, we can
continue flying also using maximum engine power.
Warning: The greatest threat for the engine is when it is working on too
lean mixture. This leads to rapid temperature growth of the piston crown, and
could result in melting or burning of the piston crown. In such case, serious
damages of cylinder, piston and crankshaft bearing could appear. In practice, it
means very high repair costs. Due to the fact that only the user is responsible
for mixture composition, the producer takes no responsibility for damages
caused by overloading the engine thermally or using inadequate oil, or using a
not correct amount of oil!

5.4 Spark plug diagnosis

1
Mixture is too lean
– it will damage the
engine

During the run-in time, a black or dark spark plug is a good sign because it means that
the mixture is rich. During the run-in time, we advise you to err on the side of caution and
use a rich mixture at the expense of slightly weaker engine performance.
03/03/2024
2
Mixture is rich, but
very safe.
3
Optimal mixture
(dark grey or dark
chocolate)
V6
4
New spark plug –
for comparison
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