I'mrunning slightly rich, with 46 jet, 3 shims (0.017) and 2 1/2 turns. It pops a bit when cold, plugs areblacker than brown. What would you do, leave as is, remove 1 shim or go to 2 turns?

 

If the plugs are black after idling for a minute, screw the idle adjust in.
Run the bike on a deserted road, hold the throttle open 1/2 way in 3rd or 4th gear, when safe to do, roll off the throttle, hit the kill switch, coast to a stop, and read the plugs. If they are not light brown, drop the needle.

 

thanks, so check if its an idling problem first, turn in screw if needed and then check again, and ifits still too richthen remove a shim

 

Rich where?
What throttle position?
0~1/4 = fuel screw. slow jet.
1/4 ~3/4 = needle clip position.
3/4 to WOT = main jet.

When doinga throttle chop use NEW plugs, look at the base ring to determine AFR.
http://www.dragstuff.com/techarticle...ead-plugs.html