If I understand correctly, your first car is an MBX-6 with an OS V-Spec?
It may have been wise to start with something a little less full-blown race set-up.
I also have a suggestion. If you can turn your flywheel that easily, check to see if the clutch nut has loosened, allowing the flywheel to spin on the crank shaft and not turn the engine over at all.
Probably not your problem, but if the flywheel is THAT easy to turn, that would be a possibility.
Don't give up, and find your local track and just show up. If you have problems, people will assist you. The most experienced racers at the track are often selfless and seem to enjoy helping people and seeing them be able to turn laps at least as much as they enjoy turning laps themselves. These are the racers you want to befriend. They know that the more people they offer their experience, help and suggestions to, the more people will stick with the hobby and the more it will grow.