Besok saya mau servis sepeda motor di bengkel dekat rumah.

Because Indonesian often puts time expressions at the beginning of a sentence to set the time frame right away.

• Besok = tomorrow
• Saya mau servis sepeda motor di bengkel dekat rumah. = I want/am going to service my motorcycle at the workshop near home.

This is very natural in Indonesian. You could also say:

• Saya mau servis sepeda motor di bengkel dekat rumah besok.

That is also grammatical, but starting with Besok sounds very common and clear.

Mau usually means want to, but in everyday Indonesian it often also suggests a planned or intended future action.

So in this sentence, saya mau servis sepeda motor can mean:

• I want to get my motorcycle serviced
• I’m going to get my motorcycle serviced
• I plan to get my motorcycle serviced

It is less formal and more conversational than akan.

Yes, but the nuance changes a little.

• Mau = intention, desire, plan, often conversational
• Akan = future marker, often a bit more neutral or formal

Compare:

• Besok saya mau servis sepeda motor...
  = Tomorrow I want/am planning to get my motorcycle serviced...
• Besok saya akan servis sepeda motor...
  = Tomorrow I will service/get my motorcycle serviced...

In everyday speech, mau is very common.

Yes. Servis is a commonly used loanword from English service, and in Indonesian it can function as a verb in everyday language.

So:

• servis sepeda motor = to service a motorcycle / to get a motorcycle serviced

This is very natural in conversation. In more formal grammar, Indonesian often uses prefixes for verbs, but with loanwords in casual speech, people often use the base form directly.

You may also encounter:

• menservis = to service

But servis by itself is extremely common.

Not necessarily. In real usage, it often means to take the motorcycle in for servicing rather than personally doing the mechanical work.

So:

• Besok saya mau servis sepeda motor di bengkel...

most naturally means something like:

• Tomorrow I’m going to take my motorcycle to the workshop for servicing.

Context decides the exact meaning. If you wanted to make it clearer that someone else will do the work, you could say:

• Besok saya mau servis sepeda motor saya di bengkel.
• Besok saya mau bawa sepeda motor saya ke bengkel untuk diservis.
  = Tomorrow I’m going to take my motorcycle to the workshop to be serviced.

Di is the preposition in / at / on, depending on context.

Here:

• di bengkel = at the workshop / at the repair shop

So:

• servis sepeda motor di bengkel = service the motorcycle at the workshop

Be careful not to confuse this with the prefix di-, which marks passive verbs.

• di bengkel → di is separate, a preposition
• diservis → di- is attached, a passive verb form meaning be serviced

Bengkel usually means a workshop, repair shop, or garage, especially for vehicles.

In this sentence, it most likely means:

• a motorcycle repair shop
• an auto/motor workshop

So di bengkel dekat rumah means:

• at the repair shop near home

In Indonesian, dekat rumah often naturally means near home or near my home, especially when the subject is already clear.

• dekat rumah = near home / near the house
• dekat rumah saya = near my house

Both are correct. The shorter version sounds very natural when the meaning is obvious from context.

So this sentence does not sound incomplete without saya after rumah.

Sepeda motor is the full term for motorcycle.

In everyday Indonesian, people very often shorten it to:

• motor

So both of these are common:

• sepeda motor
• motor

The full form sepeda motor is a bit more explicit, while motor is more common in casual speech.

Yes, aku is possible, but the tone changes.

• saya = polite, neutral, standard
• aku = informal, personal, casual

So:

• Besok saya mau servis sepeda motor di bengkel dekat rumah.
  sounds neutral and standard.
• Besok aku mau servis motor di bengkel dekat rumah.
  sounds more casual and conversational.

A learner will often first learn saya because it works in more situations.

Sometimes yes, if the context already makes it clear who is speaking.

For example, in conversation:

• Besok mau servis sepeda motor di bengkel dekat rumah.

This can sound natural if it is already obvious that I am the one talking about my plan.

But including saya is clearer and better for learners.

Indonesian often leaves possession unstated when it is obvious from context.

So:

• servis sepeda motor can naturally mean service the motorcycle or service my motorcycle, depending on context.

If you want to be explicit, you can say:

• Besok saya mau servis sepeda motor saya di bengkel dekat rumah.

That clearly means:

• Tomorrow I want/am going to get my motorcycle serviced at the workshop near my house.

Yes. Here are a few common variations:

More casual:

• Besok saya mau servis motor di bengkel dekat rumah.

More explicit about possession:

• Besok saya mau servis sepeda motor saya di bengkel dekat rumah.

More explicit that it will be serviced there:

• Besok saya mau bawa sepeda motor saya ke bengkel dekat rumah untuk diservis.

A bit more formal:

• Besok saya akan menservis sepeda motor saya di bengkel dekat rumah.

However, the original sentence is already natural and commonly understandable.