I would send it into towerhobbies and see what they say, there the warentee garentor, they may replace it if it looks faulty,its nice to get opinions from outside the box but you will find there are few consistant answers on any particular subject very one has a opinion and there free to express it,but it doesn't necessaraly meen its fact.

Mr cox believes OS makes sub par engines, not likely since there one of the most reliable glow engines on the market, to each his own.

there has been a few threads on cylinder peeling, if its the case then common sense says that hobby services(towers repair division) would fix or replace the engine as long as there was no obvious abuse to the engine tower backs its products at least it has when I have had any trouble with them in the past