Hi, just a bit of info, a flyer I now had a new ZDZ 40 which he flew for a few flights and the sulivian gas stopper came apart, piecies got into the carb, leaned it out and seized the engine. Sulivian said that some of the gas in Ca. eats up the stoppers so they sent him a few different ones and told him to soak them in the gas he was using and see which ones it didn't effect, haven't talked to him lately so don't kow what the outcome was. Anyway there maybe gas in outher states that have the same effect. Soak your new stoppers in the gas your using before using them, better safe than sorry. I had the same problem with a Black Sulivian stopper on my Ultimate with a RCS140, didn't seize the engine but the stopper just came apart in the tank, filter stopped it from getting to the engine.
Jim