Quality is the only prob with sirio engines. They need to take a good look at there manufactoring and quality control. I am not trying to bag sirio And i realy hope they come through with the goods. I think its the lack of offical info that makes the situation worse. For a long time they have had probs with how or who harden some of there parts. I gess I'm just disapointed with the last sirio i recived It was a great paformer and I wish i could use it. Regards Jeremy.