So I found a 87 liquid cooled yz 80 in a collapsed shed. I pulled it all apart, cleaned everything up. And when I checked the Tranny, it had clean oil and looked to be in good shape. I added new oil and fuel, it started like a dream! It sits on my stand and goes through every gear without any irregular sounds and revs good. But when I try to ride it it stalls after a couple feet. I'm stumped lol. I would really like to get this thing going again, anybody have any ideas?