[NSRCA-discussion] Bearing tip for OS 1.40 RX

[Koenig, Tom]

Hi Guys,
Please dont take this the wrong way and I dont want to rain on your parade-but...

I dont think it's as simple as what you say. May I ask why you are pouring castor oil in there? ( OK I know why..but...)
I have seen/experienced symptoms like you describe-but generally in motors where the set-up parameters may not be optimal. Ie; pipe too short and prop too big and no crankcase cooling, wronfg fuel and compression ratio.

No crankcase cooling can cause the pump to get too hot and boil fuel. This shows up as all sorts of symptoms and genarally causes havoc. Also, if that engine is getting too hot whatever castor you have left in there will burn, perhaps causing a varnish build up and the rest is history.

However all bearings will wear and the big 2 strokes usually let you know when the idle suddenly turns to custard. Then you must immediately change bearings.

Check over all possibilities-the Japaneses usually know what they are doing ( and if they dont-they'll never admit anyway) but down here, all the OS's run perfectly once the set-ups are correct.Having said that -expect to change bearings every 50-100 flights depending on climatic conditions.

Ofcourse I place a caveat on this- I use a YS <VBG>

Good luck and best regards

Tom


-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of R. LIPRIE
Sent: Monday, 3 July 2006 1:21 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Bearing tip for OS 1.40 RX


You no Ed,

            You are as right as anyone could be. OS is a very good engine without  that dang piece of junk ball bearing. And I I've made complaints and I no I'm not the only one that has. But I don't no why they keep putting that thing in there. They do no what that bearing does. But like I told them you would  get better sells of your engines if you would put the good ball bearing in there. Because everyone is starting to find out that the OS ball bearing that is stock is junk. So everyone just keep complaining.

Matt

----- Original Message -----
From: Ed Alt <mailto:ed_alt at hotmail.com> 
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org> 
Sent: Sunday, July 02, 2006 10:09 PM
Subject: [NSRCA-discussion] Bearing tip for OS 1.40 RX

This is an FYI for anyone with a new OS 1.40 RX.  Thinking about running with the stock bearing for even a short time?  Think again.  I was anxious to get a new model flying for this weekend and decided not to take the time to first swap out the junk stock bearing in a new RX.  I figured if I dosed it with after run oil after every flight I could get through he weekend and then do the mandatory swap to a sealed bearing.  Here's the full history. 

Friday, June 30 I did two break in runs on the ground.  Didn't do any after run between these two runs.  They were only 30 minutes apart. What could happen?.  Another 30 minutes after the 2nd break in run, did a short flight.  Had a transmitter trim lever problem, landed quickly, de-fueled, ran it dry, literally ran nearly 20 squirts of Amsoil Metal Protector through it.  Doused it.  Got it home, added a full carb barrel of castor oil for good measure and worked it through.  Yeah, that ought to do it.  Dehumidifier running all day, all night in the basement...

Saturday, July 1 dawns.  Bearings still feel OK.  Head to the field.  Fly.  Work a carb barrel of castor through it.  Repeat for 3 more flights.  Note that the bearing is starting to feel rough already.  Take it home, swap for a sealed bearing.  Note that the bearing is rusted already and that the crankshaft has light scoring from the inner race turning on it.  7 runs, handled like a newborn baby.

IMO, it is a disgrace that OS continues to produce this engine with a trash bearing that can't stand up to even the most careful use for more than a day.  They KNOW what should be in there, since they do it for the EFI version.  Lesson learned, if I ever do use another new RX, I'll never again make the mistake of doing even a single run without first swapping the main bearing.  It's not like the sealed bearing is all that expensive either.  I get them locally for a little over $11 each and they work great.  You don't even have to waste money on an overpriced Boca or EFI verson from Tower.

Ed





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