RE: Thunder tiger 91 mounted at 225 deg. dies
Try an f type......it won't hurt. If it coughs, splutters and dies it will be rich. If it just cuts will be hot. Make sure you can see a small trail of smoke (not too much), smoke out heat out.
If it at idle on the ground for 10 secs and then immediately WOT if it coughs and splutters too rich, lean the low speed needle JUST A 1/16 OF A TURN. Then readjust the high end to 2 clicks off max revs.....keep doing this until it picks up well when you kick open the throttle.
If on the other hand after 10 secs idle it cuts at immediately WOT then richen low end needle and adjust the high speed needle as before.
The twin needle set up is a balancing act between the 2.