Just back from PESC. Finally the front left fender 'ngek-ngek' sound is gone.  Picture below shows the culprit. Seem like the 2 piece of metal has a gap. Solution, put some kind of glue/rubber/silicon between those metals and a little hammering to put those 2 metals back together..

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More like a assembling mistake. At 1st the sound is not so noticeable but as time goes by, it become louder (because the gap become wider). But as long as it can be fix, fine with me. 

Correct. Because Waja CPS is basically the same Waja with different engine. So most of the problem are inherited from the older brother..