250 Yamaha 4 stroke not looking good

[scook]

I agree - you want the factory shop manual.

You might be able to get one online and download it to your computer (cheaper). I do prefer being able to leaf back and forth in a paper version, but you may be able to print the pages for what you want to do. With printouts, you won’t care if you get oil or grease on the pages and if you have an old laptop computer laying around, you can dedicate it to “shop computer” and have your manual handy. I did that for an old ford truck and it worked well.