Changing speed sensor

[lee8040]

Is it easy to change on a gpz 500? Do I just need the sensor or is the seals that also need replacing?

[jaffa90]

Any pics of yours?
https://www.bikechatforums.com/viewtopic.php?t=326503

[MCN]

It is good engineering practice to replace the old seals.
It may be ok but if the seals leak then you have to do the work again.
May not leak immediately but it helps prevent phaphery.

Caveats : Unless you do not have/cannot source/can't afford new seals.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[RhynoCZ]

To what MCN says, I've got only to add that paper gaskets (unless we're talking the crankcase (gearbox), where spacing really does matter), may be fabricated for next to nothing (easy job). O rings and crush washers of all sorts are generic and you do not have to buy the motorcycle/model specific ones.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor