my f7 has 80 miles on it now. took it up to mancelona last weekend riding some of the trails the check engine light would flash for 10 minutes or so before I could get in some loose stuff to cool it down sounds like a common problem. Manual says light flashes when temp. reaches 176 but does not go on steady until 200. I never did reach 200. Anyways I drained the cooling system and am refilling with engine ice, pulled off the pipe and looked in the cylinders the pistons look perfect but the cylinder walls have some scratches or scuffs not deep enuff to catch a fingernail on and not as deep as the crosshatching on the cylinder wall. dont know if this is normal or not . thanks in advance for any input.