flushing hole, which one ?

Your engine is a Suzuki DF25.
Suzuki recommend flushing using muffs with the engine running.
The flushing port is AFAIK for flushing the engine when it is not running.
Sorry, can't tell you which port to use.
 
Your engine is a Suzuki DF25.
Suzuki recommend flushing using muffs with the engine running.
The flushing port is AFAIK for flushing the engine when it is not running.
Sorry, can't tell you which port to use.

I agree.

The lower (larger) port is the flushing port (Same as my DF115). The plug unscrews and you can get standard hosepipe fittings to attach your hose.

As CLB said above it is not to be used with the engine running. (I use it to flush thru for 5 mins when we get back to the dock after every trip).
 
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