Magnum 52 FS idle w/o glow driver  
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Magnum 52 FS idle w/o glow driver - 3/26/2006 1:31:16 AM   
*JCB*



Posts: 573
Joined: 9/23/2004
From: Redondo Beach, CA, USA
Status: offline 		My magnum 52 four stroke WILL NOT drop below 4000 rpm w/o a glow driver on it. the engine is relatively new with only about 45 minutes of run time on it...with the glow driver on the plug, the motor will run great, all the way down to 2200 rpm. if i drop the rpm below about 4000 without the glow driver on the plug, the engine just quits, no sputter, not choke, no nothing, just dies. I have tuned the top end to about 400 rpm off max and am trying to tune the low end, but it won't idle well enough to do so. i have tried a number of different settings on the low end with ZERO luck.

any suggestions???

15% powermaster
os type f plug
12x5 prop

i have a magnum 91 FS that runs great! and i haven't had any sort of problem with it, so i'm starting to get frustrated with the 52! i know they have potential, i'm just having a hard time finding it

thanks!

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       Post #: 1

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 2:20:11 AM   
w8ye



Posts: 17301
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: online 		They seem to be easy enough to set up. I have two 61's a 91, and 120. All four strokes.

My 61 (which looks exactly like a 52) has one thread showing on the idle needle.

Enjoy,

Jim

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Attended the CutFinger Institute of DirtNap University for years but never did graduate....

Club Saito Member #7
Original AMA #31261

(in reply to *JCB*)
       Post #: 2

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 4:01:16 AM   
Ed Cregger



Posts: 7644
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		Call the folks that do the warranty work for Magnum engines. You should be able to idle lower than 4k rpm by now, assuming that you have tried a different plug (OS Type-F) and found the same results. They are great folks to work with. Don't struggle in the dark. It's a waste of time.


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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

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       Post #: 3

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 4:09:00 AM   
TLH101



Posts: 5493
Joined: 12/27/2001
From: Corpus Christi, TX, USA
Status: online 		Try starting from scratch with the low speed needle. When they keep quitting at that rpm range, it can be hard to tell if it is rich or lean.
Close the throttle all the way down until only a small pin tip will fit into the throat past the barrel. Next, attach an extra piece of fuel line to the carb nipple. Now try to blow through the fuel line. Adjust the low speed needle until you can just barely blow air through the line. That will get your low speed needle very close to the correct setting. Now you can fine tune from there.

_____________________________

Terry
"Old Fart" in training. (not to be an R/Cer, but to be an "Old Fart")

(in reply to Ed Cregger)
       Post #: 4

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 5:43:47 AM   
Flyboy Dave



Posts: 13372
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: online 		If the fuel is not fresh, it will give you fits. Use the OS "F" plug.

FBD.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
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(in reply to TLH101)
       Post #: 5

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 6:00:28 AM   
MOTORMAN37



Posts: 2062
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: offline 		Mine was inverted, with a cline regualter and would idle @ 2,100 with a OS F running on 15%.

(in reply to Flyboy Dave)
       Post #: 6

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 6:03:38 AM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline
quote:

ORIGINAL: *JCB*

My magnum 52 four stroke WILL NOT drop below 4000 rpm w/o a glow driver on it. the engine is relatively new with only about 45 minutes of run time on it...with the glow driver on the plug, the motor will run great, all the way down to 2200 rpm. if i drop the rpm below about 4000 without the glow driver on the plug, the engine just quits, no sputter, not choke, no nothing, just dies. I have tuned the top end to about 400 rpm off max and am trying to tune the low end, but it won't idle well enough to do so. i have tried a number of different settings on the low end with ZERO luck.

any suggestions???

15% powermaster
os type f plug
12x5 prop

i have a magnum 91 FS that runs great! and i haven't had any sort of problem with it, so i'm starting to get frustrated with the 52! i know they have potential, i'm just having a hard time finding it

thanks!


Are you able to pinch the fuel line between fuel tank and carb during idle? If so, and when you pinch, rpm goes up, then idle is too rich. If when you pinch, the engine quits without speeding up, then it's too lean.

Usually if it idles with the glow driver on but quits w/o the glow driver, then the idle is too rich. Try the idle screw at 2 turns from fully closed, and gradually turn in at 45 deg increment until you find the ballpark.

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When H=0, all of airplane's velocity becomes crash energy!

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       Post #: 7

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 4:21:05 PM   
Test005



Posts: 1044
Joined: 4/28/2004
From: Ţo, FINLAND
Status: offline 		I have a Magnum .52fs and it idles pretty low. Still breaking in, but the engine performs very good and is really reliable.
The setting for my low speed needle is 2 turns out and the high speed is about 2.5 turns out. This setting seem to be good for my engine.

MAS 12x6
OS-F plug
15% nitro

(in reply to seanychen)
       Post #: 8

RE: Magnum 52 FS idle w/o glow driver - 3/26/2006 6:22:03 PM   
w8ye



Posts: 17301
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: online 		If your fuel tank is too high, most engines will give you fits on setting the needle valves and quitting on you.

Enjoy,

Jim

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....

Club Saito Member #7
Original AMA #31261

(in reply to Test005)
       Post #: 9

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