As Martyn suggests the FAQ The TTR FAQ web pages have lots of info regarding the TTR250. Also seeTHIS thread for more info.
Congratulations on joining, many helpful people on here that are more than happy to answer any questions that you have (or provide a link to the info).
Enjoy!
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 +
mounted at the front of the engine to one side, can not think what side, just not seen many pictures with them added.
So its an oil cooler, lol, looks like a little radiator, with hoses going to it.
If you want to make a few quid then put the oil cooler on eBay - worth about £150!!!!!!!
I used the search function earlier and found it was not a cheap add on. Is it really that beneficial. I know of one time tbioengineer had to work hard in heavy mud, bud do not see that happening again