Went about ten miles on my new build, it started going slower and slower like it was losing power, Finally quit. Thought it was a case of another blown head gasket. Looked at the gasket and it seemed fine. Took the spark plug out to check commpression and thier was plently. But I noticed that even with the sparkplug out the back wheel was still really tuff to turn with the clutch engauged. Don't know if it's something in the clutch or something else. Any help would be appreciate.