Hello,
What do all the letters mean above the Speedo lights? There is N - with a green light aka neutral. F - with a yellow light, C - with a red light, and H with a blue light aka high beam?

Thanks,

My thoughts:-

F = flashers (indicators)
C = charge/charging (if it stays on when the engine is revving above 2-3k, then the battery probably isn't charging properly)

Oh, and 

What Alan said... and yes on blue for high beam. 

If you have a "c" light it's likely a 12v starter/generator model that requires a good battery to get spark.  Similar to the US AT1.