Early on in the life of my Saito 100 it developed play in the shaft from the same problem. Bearing failure with the presence of rust. No warrenty even after I explained that it was only on its third gallon of 30% nitro with the use of after run oil. Break in was very cautiously by the book and the engine was not abused. Paying for the repair hurt. Several small failures later and the obvious lack of gusto from a season of almost daily use, I decided to move on. Enter the season of power and smiles. My move to the YS 110 was very positive. It is still, what I consider to be, one of my best investments in R/C. Later, Joe