This has been the case on all of the 222's I have heard about. That includes 3 that I have had direct contact with and at least 4 that I have first hand accounts by their owners.
Yes, there are several other items that need to be addressed on this engine.
1. spark plugs - I know they claim they are NGK, but they have no markings and I suggest replacing them.
2. reeds - Replace them with Boyesen, either fiberglass or carbon works fine. The factory ones are trash and will tear after only a dozen or so flights.
3. rings - I'm not sure if the factory rings will cause a problem, but they are not nearly the quality of the Bowman's. And they are relatively cheap.
4. carbs - seat the needles by running them in and out several times until you get a repeatable stop point. Then set to factory settings and it will be a bit on the rich side. Fine tune from there.
Since these mods, I have run about 200 flights with no issue whatsoever and the engine is strong as an ox.
Here is a link for a free degree wheel.
http://www.rcuniverse.com/forum/engine-conversions-92/9408924-free-degree-wheel.html