2015 EC300 questions.

[Barbs]

Hi all. First time poster here and loving the forum.

I have recently got myself a new EC300 and have now put About 400km on it. After about 80 odd km of riding I put in a NEDJ needle #2 clip, left the 175 main and air screw around 2.5 turns. It rocks and plug checks all look good so far. I'm seriously loving the bike!

What I would like to know is do the gearboxes usually leave metallic residue on the sump plug? First oil change at 200km the plug was covered in fine metallic residue maybe 2-3mm thick all over the magnet, next change at 400 km still produced residue but only half as much. I'm hoping the residue is due to wearing in the engine.

Next question is regarding chain tension. When riding I can hear what sounds to me like chain slap or rattle. I have adjusted the chain as per the manual (35-60mm at the rear of the chain slider) but I'm concerned that it is too tight. When I compress the suspension the chain pulls tight and I'm worried it could be loading the gearbox bearings too much? At the moment the chain is looser than the manual specifies but I hear a chain rattle sound when the suspension is compressing. Is chain rattle a common thing on these bikes?

Thanks in advance.

Mark