As an afterthought, I did not read the original post too well.
A 10cc pipe on a 33cc engine could well be opening a can of worms, and cause very bad running, throttle setup and engine overheating due to the pipe being too small. The shockwave that should push back the fresh charge into the cylinder, will probably arrive when the scavenge ports are still wide open, causing severe loss of power and overheating, possibly backfiring.