Sometimes the detents punched for those selector levers are not in quite the right place. Perhaps you need a little more engagement than given in the forward detent. Bottom line, go through it and make all adjustments as listed making sure things are where they are supposed to be like keys on shafts ect. Sometimes things are overlooked or are just plain crap in our cheap Chinese stuff. I for one am glad of the huge amount of info for guys like us trying to make them work well. I can't afford better. Once things are all aligned and adjusted you might be in good shape. If not, I can tear into the same model to answer specific questions if you need.