Hi I'm Joe and I have a venerable old 1993 Gas Gas Jordi Tarres replica Contact T-25 aka as a JT 25 or GT 250 sometimes depending which You tube video you watch,. the bike was bought as a wreck needing :-
New Suspension bearings, new clutch plates, the clutch slave cylinder screw threads needing Helicoiling, a clutch rod, CDI repairing, the plastics repairing, new water pump seal, a radiator fan switch of some kind, a fan motor rebuild new rear brake master cylinder
However apart from the clutch rod, and the original light units it was all present had good compression and the motor its self felt good.and so could be made good. . . . over some considerable time