I've never trusted or been a fan of "plug chops" or checking the color of the spark plug.
The best way to tell if your motor is tuned right is to just ride it, listen to it, and smell the exhaust.
You can also check the timing with a timing gun to see if you are in the correct ball park with specs.
If the exhaust is smokey and it rides slow and cool you are probably running too rich.
If the exhaust is clean and the motor winds out very fast and the cylinder shroud gets too hot to touch, then you're too lean.
If it backfires.. then you have ignition happening too late, it probably will run cool and sluggish.
If it fires too early it may run hot and seize, but it will wind out faster.
The way on timing is to set it to factory recommended settings and vary it slightly from there. making sure to get good performance but not run it so hot that it explodes or backfires. it's a balancing act.
But I would not trust plug chops. When you kill the ignition and/or fuel to do the chop you will not get an accurate view of what is going on in there as the fuel mixture will still be getting sucked through the carb even if you turn the gas off (there is enough gas to let the engine run for about 30 seconds) So getting the fuel and spark to stop at the same time to get a good reading it not very likely.
All of the above Mike and also, the way to do plug chops, as told to people, is to WOT in third, then cut the ignition and turn off gas. Yeah, that's really good for a two stroke, get it hot then cut off the fuel that cools everything down. Kinda like coming off of the freeway, running full blast, then, shutting the throttle off, what you get is an insta seize. Run 'em and listen to 'em,smell em beat the hell out of them, but don't be shutting of the gas at high revs.
STANDARD TORQUE SETTINGS:
5mm bolt or nut: 3.5-4.5 ft/lbs
6mm bolt or nut: 6-9 ft/lbs
7mm bolt or nut: 12-14.5 ft/lbs
8mm bolt or nut: 13-18 ft/lbs
10mm bolt or nut: 22-29 ft/lbs
12mm bolt or nut: 36-43 ft/lbs
5mm screw: 2.5-3.6 ft/lbs
6mm screw: 5-8 ft/lbs
6mm flange bolt: 7-10 ft/lbs
8mm flange bolt: 17-22 ft/lbs
10mm flange bolt: 22-29 ft/lbs
Stator Screws: 2.17-2.89 ft/lbs
Kickstart Lever Nut: 16.64-18.81 ft/lbs
Coil Pickup mounting screws: 1.45-1.81 ft/lbs
Clutch Center Nut: 28.93-32.55 ft/lbs
Input Shaft Nut: 21.70-25.32 ft/lbs
Flywheel Rotor Nut:43.40-47.0t ft/lbs
Carb Sleeve Nuts: 11.57-14.47 ft/lbs
Clutch Cover Bolts: 4.34-5.79 ft/lbs
Cylinder Head Nuts: 12.30-15.91 ft/lbs
Exhaust Pipe Stub: 54.25-57.86 ft/lbs
FRAME AND SUSPENSION
Suspension unit mounting plate nuts: 14.5-19.5'ft/lbs
Suspension unit to mounting plate nut: 21.7-28.9 ft/lbs
Suspension unit lower mounting nuts: 14.5-19.5 ft/lbs
Steering head adjuster (preload): 4.34-5.06 ft/lbs
Steering head locknut: 36.2•43.4 ft/lbs
Handlebar pinch bolt: 21.7-28.9 ft/lbs
Rear suspension unit lower mounting bolt: 9.4-16.6 ft/lbs
Engine unit pivot unit:,44.1-54.3 ft/lbs.
Front wheel hub nut: 43.4-72.3 ft/lbs
Rear wheel hub nut: 54.3-65.1 ft/lbs
Wheel mounting nuts: 14.5-19.5 ft/lbs