Yes, I would ask this: Exactly HOW freely do they spin? If you look at an earlier post of mine, you will see that I had mine adjusted so there was no up and down movement, but they spun VERY freely. This led to the exact conditions you have mentioned, but when Chumma adjusted mine so that the spin was a bit less, the bike quieted down, stopped spitting gray smoke, and it has more power now than ever.