Hi there, sorry for the newb question, but in going about some of the takedown on the 1985 K100RT I have gotten myself a bit confused. When putting the fuel rail back onto the fuel injectors it wont seem to seat right (no seal because it is not coming all the way down on the four injectors), what is the best way to ensure the rail is seated properly - do you place the injectors in the rail and then replace the entire assembly back onto the block or can you do it with the injectors already in the cylinders? Thanks for the help!

There are clips that secure each injector to the rail, so that would not be an issue. The squirty end of the injector just sits in the head. Make sure you have the rail fixings such as washers and spacers in the correct order and bolt it down.
Have you installed new o-rings and filters on the injectors?
Make sure the injector recesses are scruplessly clean before removing and replacing the injectors.

You can install injectors in the block, offer up the fuel rail, take a rubber mallet and gently tap down the fuel rail to seat the injectors.  Make sure to clip each injector properly; I've experienced leaks at the interface between the rail and injector when the clip was not properly installed.

If you want to use a lubricant use vaseline (petroleum jelly) it will disolve in the fuel where grease wont disolve easily and can clog the filter in the top of the injector.

@Kaptain Holister, thank you for the clarity on that I wasant sure if I needed to replace the o rings each time but your post and the clymer manual as well mentioned that!

@robmack, thank you for the options I need to thoroughly clean them so I think i will pull them off!

@Rick G, what a great idea, I appreciate that!

Thanks again for all the advice ... I belive the main idea was the clips which I wasant thinking about. Now to probably go buy an air compressor due to overriding fear of allowing debris in the cylinders lol.

Cleaning around the injector recesses is important before you attempt to remove the injectors.
Try this link

There's plenty been discussed here about injector cleaning, refurbishing and/or replacement. Just use the forum-search function.