ok. I cannot stop laughing. Suspicions confirmed. The tile states Engine number: EX250EEA21*. According to
faq.ninja250.org, that probably is a 2006 or 2007 engine.
However, the number engraved on the engine is EX250JEA3* which seems to be 2009 or 2010?
Would that engine have the same clearances as the 2008 engine, i.e.
Exhaust: 0.22 ∼ 0.29 mm
Intake: 0.15 ∼ 0.24 mm