RE: *OS 120AX Bearing Noise*  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: *OS 120AX Bearing Noise*
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RE: *OS 120AX Bearing Noise* - 9/21/2007 5:33:52 AM   
CustomPC


 

Posts: 349
Joined: 4/19/2004
From: SydneyNSW, AUSTRALIA
Status: offline 		Thanks for the heads up DarZeelon.

The motor was supplied with an OS8. The Enya No4 would be the equivelent there. I just looked up the price of the A5 at my local hobby store and it's 50% more than the OS8.

I'm not concerned with the noise coming from my 75AX. It seems it's a trait and nothing to be concerned about.

The noise was with the supplied PowerBox muffler. I'll have to wait and see if it's still there when i mount it on the plane with the Pitt's muffler.

For the record, the 75AX started on the 3rd flip out of the box and hasn't skipped a beat since. It starts on the first flip now and so far it's the most responsive motor to needle tweaks i've had.

(in reply to DarZeelon)
       Post #: 26

RE: *OS 120AX Bearing Noise* - 9/21/2007 5:57:38 AM   
DarZeelon



Posts: 7096
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline
quote:

ORIGINAL: CustomPC

The motor was supplied with an OS8. The Enya No4 would be the equivelent there. I just looked up the price of the A5 at my local hobby store and it's 50% more than the OS8.



CPC,


That is correct. The A5, being a colder plug, should also last longer than the #8.

I believe Enya plug prices in Ozz are lower than in the USA...

As to the OS #8, Tower Hobbies offer their own, made in Japan (probably by OS), OS #8 equivalent - the TowerPower plug.


In offered deals they can sell for ~US$2.50... A small fraction of the OS labeled product.

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       Post #: 27

RE: *OS 120AX Bearing Noise* - 9/21/2007 8:16:06 AM   
Flyer95


 

Posts: 978
Joined: 9/21/2004
From: STOCKHOLM Akersberga, SWEDEN
Status: online 		CustomPC,
When you install the OS-F remember to open both needles slightly. So the oil coming out exhaust is bright and not dark. The engine should run slightly rich and will have more instant throttle response.

(in reply to CustomPC)
       Post #: 28

RE: *OS 120AX Bearing Noise* - 9/22/2007 8:23:14 PM   
thundertiger76


 

Posts: 5
Joined: 4/17/2006
From: devon, UNITED KINGDOM
Status: offline 		Hi, I would just like to say Ricky from Ripmax UK ( Tel: 02082827520) has agreed that there is a problem with the OS 120 AX engine after i sent it back to them and then bench testing it, so changing plugs or changing some thing else will not make any difference, it looks like the engine has a design fault.

(in reply to CustomPC)
       Post #: 29

RE: *OS 120AX Bearing Noise* - 9/22/2007 11:16:21 PM   
Harry Lagman


 

Posts: 1153
Joined: 11/19/2003
From: Auckland, NEW ZEALAND
Status: offline
quote:

ORIGINAL: thundertiger76

Hi, I would just like to say Ricky from Ripmax UK ( Tel: 02082827520) has agreed that there is a problem with the OS 120 AX engine after i sent it back to them and then bench testing it, so changing plugs or changing some thing else will not make any difference, it looks like the engine has a design fault.


It's all very well saying "there's a design fault" - what is the actual problem? What is "Ricky" going to do about it? Is he going to replace the engine?

There are thousands of AX 120s out there delighting their owners with their dependable, reliable service. These guys are going to be intrigued with this revelation that their engines have a design fault.

Enquiring minds need to know...

(in reply to thundertiger76)
       Post #: 30

RE: *OS 120AX Bearing Noise* - 9/23/2007 1:03:24 PM   
Zippi



Posts: 3092
Joined: 6/29/2004
From: Evansville, IN, USA
Status: offline 		I am on my second OS 120AX since I posted this thread and not because the engine failed but because I sold the plane. I now have the same engine in an Aeroworks YAK 54 .90-1.20 running an APC 17X6 prop at about 9000 rpm. Great running engine but like the first engine it has that slight rough sound at idle and idle only. It does not make any odd noises at any other rpm and doesn't seem to affect the performance of the engine. The high speed needle is very sensitive to weather change but it's just a slight tweak and you’re ready to catch some air. We'll see as time goes on if something developes from the noise or not.

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< Message edited by Zippi -- 9/23/2007 1:11:05 PM >

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RE: *OS 120AX Bearing Noise* - 10/14/2007 11:25:21 PM   
thundertiger76


 

Posts: 5
Joined: 4/17/2006
From: devon, UNITED KINGDOM
Status: offline 		Hi all.

As you can see from my other posts I have had this predicament with my OS 120 AX. Ripmax agreed that there is a problem with my engine (a knocking noise from new).

They also told me that other OS 120 AX engines were tested off the shelf and they had the exact same problem too, even after trying different plugs, fuel, props ect....

I left it in the hands of Ricky at Ripmax (UK) for nearly 2 months only to be told in the end that they were not going to do any thing about it except to offer me a refund.

Ricky said that the engine was sent back to OS them self's in Japan. Personally I don't believe Ripmax had any intensions of repairing my engine and I don't believe it was sent back to OS in Japan.

I actually believed that the problem would be resolved and thought maybe I would be offered some kind of compensation not that I was looking for it. Well as it turned out Ricky did offer me compensation, a couple of shims for the head, what on earth did he think I was going to do with them.

I am lost now with what to put in my plane, I now know not to use OS 120 AX engines after this experience with Ripmax, they are useless.

(in reply to Zippi)
       Post #: 32

RE: *OS 120AX Bearing Noise* - 10/14/2007 11:54:24 PM   
w8ye



Posts: 17490
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		The bigger OS two strokes have had this noise for years. The noise may come and go also. You may think you have it cured only to have the noise return. Some people have spent considerable money on the noise.

A guy at the field has a 120AX in a UCD60 and it has performed flawlessly all year. It has the noise sometimes. He usually flies it about 6 flights every time we go out flying.

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       Post #: 33

RE: *OS 120AX Bearing Noise* - 10/15/2007 2:33:28 AM   
blw



Posts: 4569
Joined: 3/15/2004
From: Auburn, AL, USA
Status: offline 		My .46FX did the same thing.

Dar, I've run the OS 8 plugs against the Towers plug. I think the OS 8 is cooler. Engines that need a hotter plug than the OS 8 run better on the Towers plug.

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RE: *OS 120AX Bearing Noise* - 10/15/2007 6:11:04 AM   
DarZeelon



Posts: 7096
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline 		Barry,


Thank you for this information.
I have used it so far in an OS.32SX.

It serves its purpose well, to replace the original #8... There was no need change the high-speed needle position. The low-speed needed some tweaking, but I am not sure in which direction.

Are you sure this is the new TowerPower you tried? The old Tower plugs were A3 replacements...

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       Post #: 35

RE: *OS 120AX Bearing Noise* - 10/15/2007 12:34:17 PM   
Zippi



Posts: 3092
Joined: 6/29/2004
From: Evansville, IN, USA
Status: offline 		thundertiger76,

If the noise is the only thing wrong with the engine I'd fly it. You'll love the power.


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       Post #: 36

RE: *OS 120AX Bearing Noise* - 10/15/2007 3:49:25 PM   
blw



Posts: 4569
Joined: 3/15/2004
From: Auburn, AL, USA
Status: offline 		Yes, the older Tower plugs were hotter and probably A3 equivalents like you pointed out. I have one of those left that W8YE gave me.

Yes, the newer Tower 2 stroke plug seems a bit hotter than the OS 8. I was using these in Evolution 2 stroke engines that do need hotter plugs than the 8. The new Tower plug isn't hot enough now, but the older ones were just right like the A3.

_____________________________

The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

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       Post #: 37

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