Are you sure this is a "tick" and not a "knock"? The DOHC engine likes to piston slap. It's normal for this engine. It is MUCH louder when the engine is cold and under load. As the engine warms the noise decreases but never goes away completely.

To answer your e-mail. I don't think a compression test will tell you much unless the noise suddenly came about and wasn't doing it before.

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.