Clicking and jerking at low speeds

[DJAtomus]

Mr. Bach-man
   I just purchased the 2-10-2 seaboard loco and I'm wondering if you can help me out.
First off, the engine came with some sort of black powder... What exactly is that?
2nd, the engine will at points in a curve start to click and jerk. is this a problem with my track or a problem with the loco?
-Andrew

[jettrainfan]

The black stuff is to represent coal dust, so you can glue that down and the track may be the problem, but the engine may also need a lube.

[the Bach-man]

Dear DJ,
It sounds like you may have a bent side rod. Watch the loco carefully when it clicks.  If this is the problem, gently straighten out the bent rod and you'll be fine.
Have fun!
the Bach-man