Magnum XL .52 Four Stroke Engine bench test , by Summer_ride

[7bikerboy7]

Hello I bought the os 120III surpass 4 stroke w/pump and set the needles as instructed from the instruction booklet. Low end needle..2.5 out. High end needle..1.5 out from closed position. The engine will not stay idleing at a good low rpm for too long and just shuts off...any ideas?

[Summerride]

Some people are using power applied to the glow plug at low rpm with a switch on the throttle servo because it is cooling down too much at low throttle.

[morwangsm]

i have a magnum 61 four stroke on my SE-5A WW1 plane.

engine is good but hardly to catch the best tune for it and also it is getting hotter than Os or saito engines. after last successfull tune i have flyed it for more than 30 times without any problems at all, also starts very easy after one or two turns with stick

[claytonjester]

i have never had a magnum, but am bidding on brand new .52 on ebay. i was wondering if these are pretty reliable and a good buy for the price. i know saito, ys, and os are very good, and magnum and thunder tigre, arent necessarily bad, just a little lower. more economy like engines, anyway, just wondering if its a good engine.

[Summerride]

I was very impressed how reliable this engine was. I have a lot of flight to the log and still running as new.

[7bikerboy7]

Cool vid...I have a question...Im now breaking in a os fs 120III 4 stroke. The instructions say i dont need the line from tank to muffler, what do you think?

[Summerride]

Depends if the engine as a pump. If not , I would say Yes because when you'll fly it , you will put this pipe on. Then the air-fuel mix will change depending on the pressure inside the tank. So yes make the break-in with the pipe on the muffler and fly it that way as well. Hope this help !

[piperpilot26]

hows that thing running now. is it still running? I have one that I got about 10 or so flights on, each one progressively running worse and worse. I eventually retired the thing. I would like to get it running good at some point.

[Summerride]

Are you using four stroke gas ? Is it running too lean so the engine beem worn out and progressively the compression came to low ?

[vanepico]

that sounds really nice! Dont suppose you could scan the manual or anything, cause i have heard this is identical to the Kyosho, the ASP, SC and OS 52FS

At the very minimum could you scan the page with prop selection and running instructions, i would be soooooo grateful!!! thanks

Peter

[Summerride]

Hi,

I have the manual but my scanner is dead since a while. So here is the prop size reccomendation :

11x7,8,9 ; 12x5,6,7 ; 13x4

Use 12x5 for break-in.

Just ask anything if you need !

[vanepico]

Don't suppose you have a good quality camera or anything? could you also get the running in instructions like "run half a tank through it" etc

Thanks for all your help!

[Summerride]

I can do it for you. Send me your email address and I'll get you some picts.

[Andy851]

so whats the verdict, good engine? it looks like a great engine for the price. I may be getting one in the near future

[Summerride]

The verdict is that it is a really good engine for the price. Not THAT much powerfull but it fits good on a .46 plane.

[JDeckin1296]

what were u planning on puttin that in?

[Summerride]

See my Homemade Piper Cub video , this engine is in this airplane.

[CSN13]

How do you like this engine. What planes have you put it in. Have you ha any issues?

[sheldonholy]

Are u sure thats a magnum? It looks more like an sc 52. It runs very nicely.

[Summerride]

100% Sure ;)

[sheldonholy]

OH!! Well ill be damned...! lol

[poopik121]

WOW

[Guinnie]

what plane is the engine going in?