Hello, I'm looking for a second hand Large Idler gear for 4GY1
"72T/20T (#4GY-15512-00-00) large idler gear"
I am guessing that you need it for an early model TTR. I cannot guess where you are from though (I am not a mind reader) but if you are in the US, AU or a country that does not charge tax, customs etc.. it may be worth buying both the Large and small idler gear from HERE.
Just a suggestion as finding a decent old idler gear may be like finding a needle in a haystack.
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 +