theres only one answer.......every bike will be different.....one will need it desperatly at the first check (12k) or even well before, and others may be lucky and go 50k or who knows how far. Anything's possible. the question is, do you want to chance it? thers no way to know if you will be the lucky one. However, in reality most will be out of adjustment to some degree by the time they are where his is at. If you DO decide to try and go much further than the recomended 12k, at least CHECK them to be safe. You may find they're ok or close enough. removing the valve cover and checking them with a feeler gauge isn't hard. At least that way you won't be chancing it because if you find them in need you'll know you have to do it or possibly suffer the consequences.
