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I'll also answer the question. 

There's a common human experience of waiting til the last minute to tackle a job. Students are notorious for waiting until the last minute to turn in term papers, but this habit is shared by plenty of adults. 

Grant applications, tenure packages, articles for special journal issues, peer reviews, etc--these often get pushed to the last minute (by professional people!), and then it's a mad dash to finalize the thing and submit it.

It's possible (even advisable) to discipline oneself to finish a project even when one does not wish to. It could even be the a mark of a successful writer. 

Use that idea. Use the knowledge that discipline will get you there. Your effort may be 10% inspiration and 90% perspiration, but given the scope of human accomplishment, that proportion has decent company to keep.

A second thought is the idea of fun. Have fun. Just have fun. How? Well, in fiction, there's the 'cool' factor. Use it! If the wheels are dragging on a draft, add 'cool.' Add a superpower if it's allowed, or a romantic twist, or a neat athletic or other ability for your protagonist. Toss in something fun. Toss in an untimely death if that's your jam, or a ridiculous argument. Have a character do something outrageous--to get you past this block. Have a character streak through town, or develop a gambling habit out of the blue. Why not? The other characters might have things to say about it, and before you know it things are moving again. And character is developing. And some of that bizarre passage you wrote might even unlock some new ideas and impact the final draft.

A third thought, more craft-oriented, is to continually ask oneself the purpose of the scene at hand. What is the main character pursuing and what stands in their way? It occurs to me that focusing too heavily on this idea may impede the 'cool' factor of idea #2, because the job becomes very task-oriented instead of fun. So perhaps the idea of balance will play into any final answer to the question.