Hello, I have a '91 Yamaha TY250R "pinky" that I purchased a few years back, it was the bike i learned to ride on when I was 13 and was sold to someone else and I scored it when it came up for sale on kijiji. The bike has suddenly developed an issue, when I put it into gear from nuetral into first gear with the clutch fully engaged the bike lunges forward and immediatly stalls. The bike is idling normally and the last time I rode it, was nearly a year and a half ago I recall this being an issue but I dont recall the clutch being worn out. Does anyone has any ideas of what may be causing this? thanks.