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Magnum XL 52 RFS Blue R/C 4-Stroke EngineProduct Review (submitted on December 25, 2012):
This is my first "Blue Head" 52...I also own a Magnum 70 I fly in my Phoenix Dacathlon, and a Magnum 40 2 stroke I fly in my Dazzler. I have had good luck with the Magnums, inspite of hearing bad things about them out at the flying field. So when I saw the good deal offer on the 52, well I jumped on it.! ....I mounted the 52 in my 80" wing Cub and began breaking it in in my backyard...here is where the fun began....now I don`t profess to be an engine genius, but I have been an RC modeler for 40 some years, starting out with Cox .049`s on UC models. I have 14 Airplanes, all glow, one gas, and one micro electric F-86. I thought I was a decent engine guy, hand flipping all of my engines, using a chicken stick on the 4 strokers.... but when I tried to start the blue head 52, well, as I mentioned, this is where the fun began. after flipping and priming until my back hurt without even a pop...I figured out that the engine was not getting a spec of fuel during the prime...this is the reason the factory low speed is set at 3 turns, to help in priming but is way way too rich for idle. So I solved my priming problem by disconnecting the muffler pressure line and connecting a 5 " piece of fuel tubing to it and blowing fuel into the carb....this alowed me to get the engine started. I then ran the engine very rich per the manual, but don`t throttle back much because the 3 turns factory setting on the low end will cause the engine to quit at a fairly high RPM. The manual does not tell you this...which would of helped me. You must lean the low end ALOT..a full turn or more to get even close to proper idle mixture. When I leaned the low end, well, priming now..(holding your finger over the exhaust with the throttle full open) was just not even going to work....but my 5" piece of fuel tubing was the answer for this. Ok then, after the 45 min break-in and a fairly good idle was attained, It was first time to fly. Again, following the manual, it said to fly at the richest setting that would produce enough power to fly. Well, that just doesn`t work because when you enrichen the high speed needle it also enrichens the low speed end ALOT...will no longer idle (not even close)...! So after I figured this out I leaned the high speed needle to max power and enricend slightly and then puleed the throttle back to idle, and the reliable idle was alot better. So I adlusted the low speed end again and was ready to try to fly again. Away the Cub went, anxious to fly after that rediculous engine adjustment ordeal. The bottom line on this engine is...once you have set your high speed needle, don`t mess with it or you`ll screw up your idle. In fact, the last time I went to fly, the Cub again would not idle, so I simply ran it up to full poer and leaned the high end again to slightly leaner, and then throttled back to check the idle and it was ok....I taxied out to fly. I must say that now I seem to be able to start the Cub and fly it each time...the blue head is running smoothe and reliable...at least so far....Would I buy another Magnum....hmmm...?
My other 4 srokers are Saito`s and OS`s...Love all of my engines, even the blue head....! (which is definately female)