Magnum .52FS won't idle  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Magnum .52FS won't idle
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Magnum .52FS won't idle - 3/6/2002 1:38:04 AM   
Frankenthumb



Posts: 794
Joined: 3/6/2002
From: San Diego, CA,
Status: offline 		I know it's not the greatest engine, but it ran great until I let it set for 2 months while I played with newer toys. The problem is a super sensitive low end adjustment is either too rich or too lean. When it's running lean (at low throttle) I can't even kill it with the carb all the way shut. I tried taking the low end spring out and stretching it just a little, thinking that the needle wasn't returning to the same spot every time. This has not helped.

Does anyone know how many turns the low and high end settings should be out? I keep thinking that I need to find a happy medium with the low and high settings.

All advice appreciated

Jet
       Post #: 1

Air Leak - 3/6/2002 3:41:42 AM   
Homebrewer



Posts: 1335
Joined: 12/29/2001
From: Colorado Springs, CO, USA
Status: offline 		Sounds like you have an airleak. I helped buddy out who had same problem w/ his 4 stroke Magnum. Put some fuel tubing over the high end needle valve and try your adjustments again.

(in reply to Frankenthumb)
       Post #: 2

Magnum .52FS won't idle - 3/6/2002 4:54:39 AM   
Frankenthumb



Posts: 794
Joined: 3/6/2002
From: San Diego, CA,
Status: offline 		I'll try it, thanks.

(in reply to Frankenthumb)
       Post #: 3

Magnum .52FS won't idle - 3/6/2002 7:12:54 AM   
wildthng


 

Posts: 178
Joined: 2/4/2002
From: Land o'lakes, WI, USA
Status: offline 		A new plug or a hotter plug will help idle,did you try a new plug,is the weather a little cooler there now.You have to have a hot enough plug to stay lit during the exaust stroke hotter plug will make your idle adjustment less sensitive.Fuel that sits to long after being opened can also lose some of its zip.Could be that considering you took a 2 month break.

(in reply to Frankenthumb)
       Post #: 4

Magnum .52FS won't idle - 3/6/2002 9:54:29 PM   
Frankenthumb



Posts: 794
Joined: 3/6/2002
From: San Diego, CA,
Status: offline 		I'll try a new plug. It has an OS "F" right now, and I'll try the spare one I have. Fuel is not the issue, I spent the 2 months burning fuel in newer planes. I did however swich to 15%, when the engine had only previously run on 10%. I've heard that some FS's dont like the higher Nitro. Opinions?

(in reply to Frankenthumb)
       Post #: 5

Engine - 3/6/2002 10:47:32 PM   
Homebrewer



Posts: 1335
Joined: 12/29/2001
From: Colorado Springs, CO, USA
Status: offline 		Try the plug but first try the fuel tubing over the high end needle. 4 strokes can tolerate high nitro very well. Your engine should have no problem. My buddy used 10% in his and I let him borrow a gallon of my 20/20 and it was a marked improvement in his Magnum;s performance.

Using 15% is not the problem. I am assuming you have no fuel leaks, fuel tank problems either.

(in reply to Frankenthumb)
       Post #: 6

Magnum .52FS won't idle - 3/6/2002 10:56:36 PM   
Frankenthumb



Posts: 794
Joined: 3/6/2002
From: San Diego, CA,
Status: offline 		I haven't noticed any bubbles in the line. I wonder if there could be a leak around the carb? I disassemble it tonight and look at the O-rings.

(in reply to Frankenthumb)
       Post #: 7

Magnum .52FS won't idle - 3/7/2002 2:00:47 AM   
Joss Stick



Posts: 434
Joined: 2/28/2002
From: Southern, WV, USA
Status: offline 		Check your valve adjustments too. They could be off a smidgen. It could be that after setting for awhile there is a bit of gunk not letting them operate properly too.

_____________________________

Mike in WV

(in reply to Frankenthumb)
       Post #: 8

Magnum .52FS won't idle - 3/10/2002 4:54:56 AM   
Frankenthumb



Posts: 794
Joined: 3/6/2002
From: San Diego, CA,
Status: offline 		I took some advice I got here, and the engine now runs great. I forgot how much fun it is to fly the plane. Anyway, I put some fuel tube over the needle valve, and installed a new Glow plug. Thanks for the advice.

(in reply to Frankenthumb)
       Post #: 9

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