Baxter,, my Hyper 50 sputters and stalls as I spool up, this has been going on since I bought my first Hyper 50 back when they were first realest,, in the past I could not get it to Idle for any length of time, many times it would stall as I walked to the flight line,, but as of right now the engine Idles fine (since I rebuilt it, new ring, new bearings), but this engine only has a total of 3 gallons run threw it including before the rebuild, but it will still sputter and stall on the spool up,, to get pass this sputter I have to raise the throttle extremely slowly, yet I never know if it will stall as I spool up,,

but too add I have had this SAME problem with both my Hyper 50s !! of course my # 2 Hyper I have tried the same mufflers, fuel, plugs,,

I have tried the 60B carb, different brand plugs & diff heat ranges, different fuel brands & diff Nitro percentages, 5 different mufflers including the MP2,,, and all kinds of tuning,, still I have the problem,,

I have not yet burned 30%, lately I have been burning Magnum 20% and I have had the best Idling results "it seams the problem was wose with 15%", once this gallon is gone I have 4 gallons of Magnum 30 waiting..

can I get a comment please ??
thanks !!
Jim