Stick with the stock BR9ECM plugs. You can get them at www.sparkplugs.com.
For 2-stroke oil, If it's injected Motul makes a good oil (710 as mentioned above). If the injection system is not there, Motul 800 is a good pre-mix, as is Castrol A747.
For brake fluid. DOT 4 is probably best. To go with DOT5 means you need to basically make sure there is no DOT4 fluid in the system as DOT5 doesn't mix with other DOT fluids.
Gearbox oil, Again Motul makes a good gear oil (Motul Gear 300), or Redline Light Weight shock proof gear oil is a good option. Use 750 ml. Just remember, it's not just the clutch fluid, it's the gearbox as well, so you don't want to run it dry.
That knob on the end of a cable that you turned? That's the idle adjuster (or also called throttle stop adjuster).
Just a quick plug for some work I have done
Honda never produced a service manual in English for any of the NSR's, I have spent some time translating the MC28 manual into English and have it available for sale. You can get more details in the the topic "English - MC28 service manuals for sale" (link http://www.nsr250.net/forums/viewtopic.php?t=7371) _________________
Charles Gallant