I run an Orion 13.5 in mine and I'm fine during all the heat races since we do IFMAR starts. The problem I have is in the main and the initial start of the race where it hesitates. Once going it is fine. You will see this hesitation or cogging everytime you are at a complete stop. For the most part it is not a problem except where I mentioned. For basic bashing or just messing around at the track it is not a problem IMO at all.