TRX R's are like the Honda Civics of ATV's (except they are actually fast!!!)...everyone has one and everyone has modded them whether they use them or not for racing.
Sane engine as 85-86 ATC R's....slightly differant transmission apparently.
Years were 86/87 and 88/89. I know the 88/89 had a shoter swinger and slightly differant chassis...but thats all I know. Engine didnt change I dont believe.
STOCK TRX R.....impossible. If you actually find a stock one that LOOKS and RIDES nice.....$5000 .