Thanks for any advice in advance. Good forum here. My CRAFTSMEN 2004 16.5HP Honda motor (model # 917.1273502) will start but won't engage in forward or reverse. Rear wheels seem to be locked - won't turn when pushed. This happened last year and then it fixed itself. One thing I have done wrong 3 or 4 times was to release the rod in back to engage transmission while the motor was running. The manual said to never do that. I wonder if there is a part broken or should I try to purge the air out of the trans?