I started my nc21 today after a battery charge, i had it running for a little while, ticking over nicely. However when i revved the engine, i noticed i was spraying the wall behind with what looks like really runny black oil. Any ideas on what it could be or am i worrying about nothing? Just seemed a little strange to me.
Cheers in advance.

Hello,sounds like condensation,water mixed with carbon.Warm it up and go for a ride.

^^^^^^^^^ wot he said

Choke on, start up, get a splatter up against the garage door then clears.