As Brian said, there really are no "bad" TWs. Even the '87s can be retrofitted with later electrics. Probably not worth doing unless an otherwise cherry '87 and later year donor can both be had for little or nothing.
Major changes occured with the 2001 models:
1) Front drum to front disc brake;
2) Different (not necessarily better) carb;
3) Automatic cam chain adjuster;
4) Higher electrical output;
5) H4 halogen headlight (definite plus).
Other than that, occasional minor changes, such as different main jets in the carb and relocated mounting for the muffler.
One change that really needs to be made is a better chain--the OEM chain sucks.
Major changes occured with the 2001 models:
1) Front drum to front disc brake;
2) Different (not necessarily better) carb;
3) Automatic cam chain adjuster;
4) Higher electrical output;
5) H4 halogen headlight (definite plus).
Other than that, occasional minor changes, such as different main jets in the carb and relocated mounting for the muffler.
One change that really needs to be made is a better chain--the OEM chain sucks.
