bars and depending on your weight fork springs and a harder rear spring. If your a little guy (like myself) stock suspension will last awhile. But eventually become way to soft. Set of tires would def help to. The stockers blow.
tall bars, extended fork legs w/ stiffer spring, rear shock, tall seat....to start...engine stuff l8tr...depending on how much ya got to spend.....I would put more toward suspension
a longer one yes....a cheap way to upgrad your suspension would be to use stuff from a Honda XR/CRF 70...ya have to do a little mods but not too bad....
a decent chain does not cost that much...just buy a 120 link 420 pitch and you will for sure have enough...use a chain breaker and walla custom fit ....you probably will only use between 80-100 links but having a bit extra when your mocking something up does not hurt...better to be safe than sorry
If the swingarm is extended what does the back wheel do? it moves back and this would require a longer chain to let it move back right ?It's simple math.