i have 4700 miles on my 95 ext efi when should i change them? there no noise coming from them, .the speedoo works ? just wondering??

When they start squeeling & everything comes to a screeching halt. Change just before that happens!! :D

My dealer reccomends to change them every 2 years. After changing them this Winter in the cold, when I should've been riding, I think I'll start doing them in the Summer time!! They're cheap, just takes time to replace. Grease the Drive shaft bearing atleast once a week, it'll push the old grease, sludge, & moisture out the back.

Finish out the season and change them all over the summer, I did my 96 ZRT last year although none where bad. Better now than like my buddy's 96 ZRT, on the trail.