Originally Posted by Chris Peralta

I have not really heard any negative things said about the K9. I think the only issue I saw anyone post about was a bearing going bad after 4 gallons or so. AZNitro... you mentioned your K9 is running good didn't you?

I would still rather stick with the B10's and Cross10's myself. Even on RB's site they have the K9 listed as a sport engine, where the B10 and Cross10 are listed as racing engines.