Here's the procedure I learned for my '87 Husky TC510. If the bike is dead cold:
1. Turn on the gas
2. Pull in the manual compression release
3. Kick the bike through the entire stroke of the lever 10 times
4. Screw the idle adjuster in about 1/4 turn
5. Turn on the choke
6. Kick the lever through without the manual decompressor until you find top dead center
7. Grab the manual decompressor and move the engine just past top dead center
8. Release the manual decompressor and bring the kick lever all the way back up to the top of the stroke
9. Kick hard all the way through the stroke
10. If it does not start on the first kick, repeat steps 6 through 9
11. If it doesn't start after 4 or 5 cycles of steps 6 through 9, turn off the choke and repeat steps 2 through 9
If it still doesn't start, there's something wrong with the bike. Could be ignition, could be jetting, or it could be a plugged jet from old gas in the carb or dirt in the carb.
Obviously, once the bike is running and warmed up, you'll need to back off the idle adjuster.
I've used this starting procedure for every thumper I've owned since that Husky and some have been easier to start than others. When you get good at it, you don't have to raise the idle because you get good at cracking the throttle manually. Only a millimeter of twist at the grip will be necessary. On the newer bikes that don't have a manual decompressor, the hot start will perform the same job of clearing out the engine as steps 2 and 3.
When the bike is hot you'll still need to find top dead center and kick just past before giving it the big boot and it should start. If the bike was just crashed, it may be in a rich condition and in need of clearing out. Steps 2 and 3 should help here.
I know that a lot of this is just a repeat of what others have said but the key points are that, when cold, the engine needs to be kicked through several times to "prime" the fuel system and the idle should be raised slightly so that it will stay running once your kick is successful.
Tom