Get New Engine on Your Head, Can You..???

My head is like an engine on my old '72 Vespa.
I use the engine with optimum capability,
now i use my engine so hard.

Cause....
I'm in hurry to finish my thesis...

But my engine not working now...
Need to subtitute the gasoline, eh?
Or just change the engine...?

Oh, yeah... I really need it..
I need my engine on.

Just hoping....
Can i change my old engine by a new engine...?

Old engine (Vespa Small Frame Motor Engine), like my head today

Brand New Engine (The Newest Vespa Engine), never been created before... Great!
Hope it can finish everything on time...