If its a good McCoy, it'll be enough. I have one of the older (shiny case non-double thunderbolt) ones and its very strong, starts easy, and does a textbook 4/2/4 break. A delightful engine.

I have another newer double thunderbolt one that was so loose new from the factory that it is almost impossible to start. I'll have to try mixing a 50/50 oil/methanol prime mix for it to see it it helps. The thing only has about 10 minutes on it, but it was so poorly fitted its essentially worn out before being broken in.