finding TDC on a chinese 4-stroke

[guruhelp]

I added this post to ask a simple question.
On my 114cc I can open a porthole to see the marks, instead of having to take off the side cover and when the marks go by, I do see the line with a "T" next to it, meaning Top dead center. But I also see another one comeing a few degrees sooner, marked with an "F".
What's that one for? I see a few others, that might be there just to let you know TCD is coming up, but if they are something else, let us know!

[Blitz$M.Inc.$]

lol fire?
fire tdc bang
if the F was further away from the T then you would be advancing the timing
you also need to take off the cam cover
http://www.youtube.com/watch?v=_2xRnGlqzeA

[guruhelp]

sounds logical..and since I had readjusted the valves, and put the cam in with THAT mark..it WAS running a little ODD!
I reset the cam in it's proper position (it was a tooth off) and THAT made it run right, again.
I also got a 78 and 75 main jets, to see if I can get it a little MORE 'spot on'!
Right now, it seems a bt rich, plug color is a bit dark, so I put the needle back to the middle, hoping to get the best balance, and get the mid-low throttle positions a bit more SNAP.