A 1992 model is interesting, I thought that they started making TTR250's as of 1993? , click HERE. Not saying you are telling fibs but if it is a 1992 model, it is something new and VERY rare.
If you need a full repair manual, PM (private message) me your email address and I will send it through. Bear in mind that it will be for the blue models but most things are exactly the same (at least all the main important info).
Enjoy the forum Paul!
Jarrah
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2000 TT-R250M-
Spoiler
Ported & polished, 73mm bore, Wizeco piston, US header pipe, FMF Q4, #150 main jet, #52.5 pilot jet, throttle stop screw adjusted, larger snorkel, GYT-R air filter, NGK Iridium spark plug, 14/51 gearing, NOS +
The "K" prefix plate registration letter was used in the UK between 01 August 1992 and 31 July 1993 so a 1992 bike is possible but I haven't come across one before
The frame dating information in the FAQ is as follows: