Won't Shift Into Gear While Running

Throw out bearing is good, has the correct 1 inch play right now and it's just back of the forks.

Just double checked oil and it's 90W. Has a lot of bubbles on it though. Tranny has been rebuilt but customer had it done years ago, guess it could be synchros but that would really surprise me with a completely rebuilt trans. It won't go into any of the forward gears and gives a nice crunch trying to go into reverse.

Could be a dried up pilot also.
Causes the same thing.