Dave,

First I would like to thank you for having this direct line in the RCU forum. Having it is one consideration I use for purchase and one of the reasons I chose to buy the FZ110, my first YS product, despite what others said about they being finicky. I loved the engine in my Funtana 90 for the first 3 or 4 gallons of Powermaster 20/20, nice power and cool looking smoke trail (I assume this is natural result of the supercharging, since it was present even when running a little lean). Last three flying sessions have been a nightmare though.

It all started one day with the engine acting like the low end was rich, ie dying with the application of throttle. I also found when I could get it to run at high throttle, engine rpm surged up and down. Adjustments of the needles and fuel regulator did not cure the problem, and when I finally decided to take the regulator apart, found a small pebble, approximately 1/64th" square. Cleaning that out and reseting the needles the engine ran well enough to take a flight or two but it still not right based on the following.

-No matter how much the high needle is richened, there is no smoke in the exhaust
-There seems to be less power at the end of the flight than at the beginning.
-While I don't have any bubbles from the fuel tank to the engine, I do have some from the regulator to carb. More at low throttle, fewer at higher settings. There doesn't seem to be any holes in the diaphram.

Your comments/suggestions will be appreciated.

Sincerely,

Frank