Originally Posted by pecos
Just called my old man. He said the same thing about loading the clutch with each gear. Poo Poo Ka-Chu.
Then your old man knows a thing or two.
I'd guess the cable is out of adjustment. Even if your clutch is drenched in oil, it usually won't slip until third or fourth gear. Try putting more slack in your clutch cable and I bet it'll start behaving. I believe the correct spec is 2mm of free play at the lever before it makes contact with the pushrod. There's also a spec for cable length from the cable stop to the lever on the back of the trans, but to me it doesn't matter much as long as there is free play.