The injector themselves are a sealed unit. There's really not much inside them. There's a tiny filter and a tiny pintle valve. The only moving parts are the spring and the pintle itself.

The seal kit won't stop them from leaking fuel but it might help with idle issues.

They're really easy to get out btw, just pull on them! they're only held in by the o rings in that seal kit. If they're stubborn use two screwdivers either side of the injector and lever off the rocker cover.

The seal kit is the o rings in the bag in this pic.
The brass things are the injector holders, designs vary.



Pete