Japanese · Pronunciation Guide
ka-ku, two beats with two soft k's, and the final u is normally whispered away.
kaku
Both beats are measured identically, with a fall after the first. Two k's in a row means the word's rhythm depends entirely on the vowels between and after them — and since one of those vowels is whispered, you have to trust the timing rather than the sound. Count two even beats regardless.
Listen: 書く
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今手紙を書いています。
Ima tegami o kaite imasu.
I'm writing a letter now.
Listen: 今手紙を書いています。
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今手紙を書いています has 書いて, three morae (ka-i-te) with the two vowels kept separate. 手紙 before it is three more (te-ga-mi). Notice that this te-form doesn't produce a geminate — 書く takes an い instead — so the sentence quietly demonstrates that Japanese verbs don't all conjugate the same way.
"KAH-koo" with two full rounded vowels and stress on the first is the standard English attempt. All three of those need fixing: shorten the a, unround the u, and let the second vowel devoice. Learners also aspirate both k's, which gives the word a percussive quality that Japanese consonants simply don't have.