Honda 200m spark plug problems...
When riding the bike at higher speeds and for longer duration, the plug wont foul and is brown in colour as it should be. When the bike goes on short trips and idles a lot the plug will foul and is black in colour, obvoiusly running too rich.
Based upon these clues, I have concluded that the main jet is set up properly but the low speed is not.
According to the manual, you turn the low speed jet in untill the motor stumbles, then slowly continue till it stalls, then turn it back 1 full turn. I have tried turning it back in (from the 1 turn out after stall position) but then I end up with a hard starting scenario.