[NSRCA-discussion] OS 140RX Need Help

Sun Aug 9 08:54:46 AKDT 2009

Larry,

I have run the 140RX -- FANTASTIC engine!!!  I 
agree with Dave.  When you pinch the fuel line, 
you lean out the engine temporarily, so it picks 
up speed until it dries out and quits.  Lean the 
low-speed needle until it will idle "forever" -- 
a minute or more, and pick up smoothly through 
midrange to full throttle without hesitation.  I 
have never had my 140RX stall, at idle or in the air...

At 12:49 PM 8/9/2009, you wrote:
>Content-Type: multipart/related;
>         boundary="----=_NextPart_000_008C_01CA18EF.D0400F70"
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>
>I’ve never had an OS 140RX so I’m certainly no 
>expert on them but it sounds like you are too 
>rich on the low end to me. You may still need a 
>bearing change and new ones won’t hurt but 
>I’d  try a little leaner bottom end first.
>
>From: nsrca-discussion-bounces at lists.nsrca.org 
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Lisa n Larry
>Sent: Sunday, August 09, 2009 12:41 PM
>To: 'General pattern discussion'
>Subject: Re: [NSRCA-discussion] OS 140RX Need Help
>
>I pushed some Denatured Alcohol through the pump 
>and it seemed to clear that up quite a bit...If 
>I let it sit it will drip a little now and not 
>at all at idle. So that seems to be under control...
>
>Now it idles very well and I can adjust top end. 
>I'm getting about 7,900 on a 4 bladed prop 
>15.5x12 APC w/ PM Mean Green (15% w/ 18% all synthetic oil).
>
>However, once it idles for any length of time or 
>even 1/2 throttle, it will bog down and quite as 
>soon as I start to advance the throttle. If I 
>pinch the fuel tube it will pick up and run. If 
>I go high then low and back to high throttle 
>without too much delay it transitions well. If 
>I'm at idle for about the same time as stall 
>turn down line (2 or 3 seconds) it will bog down...
>
>This is what I'm assuming everyone has keyed in 
>on as the symptom of a main 
><http://www.rcuniverse.com/buynow/keywordclick.cfm?bid_id=6534>bearing 
>going bad...
>
>Off to surgery...now I get to see what the inside of a 140RX looks like...
>
>Again, Thanks for all the help....
>
>
>----------
>From: nsrca-discussion-bounces at lists.nsrca.org 
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Lisa n Larry
>Sent: Sunday, August 09, 2009 9:15 AM
>To: pnahobbies at sbcglobal.net; 'General pattern discussion'
>Subject: Re: [NSRCA-discussion] OS 140RX Need Help
>
>I have the stock needle
.
>
>My main spare bearing is a Boca Bearing
P/N 
>6904Z and it is either shielded or sealed

>
>There appears to be no detectable play in the 
>main bearing currently installed in the motor

>
>My strategy is to flush the pump first and see 
>how it responds
If no go, then replace the main bearing

>
>Thanks for all the help, I will keep you 
>posted
Hopefully we will get a few practice flights in yet today

>
>Larry
>
>
>----------
>From: nsrca-discussion-bounces at lists.nsrca.org 
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ihncheol Park
>Sent: Sunday, August 09, 2009 3:46 AM
>To: 'General pattern discussion'
>Subject: Re: [NSRCA-discussion] OS 140RX Need Help
>
>losmg7025.jpg
>
>
>61FX needle is longer than the one on 70A.
>
>losmg7052.jpg
>
>
>Stock needle for 70A carb.
>
>From: nsrca-discussion-bounces at lists.nsrca.org 
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Lisa n Larry
>Sent: Saturday, August 08, 2009 10:37 PM
>To: 'General pattern discussion'
>Subject: Re: [NSRCA-discussion] OS 140RX Need Help
>
>Dennis, as always you are right on the money

>
>I have not touched the pump or anything else 
>other than the HS needle
I believe it is either 
>an OS # 8 or a “F”
I don’t have a 61 FX

>
>Always coming back to the main bearing
There seems to be a trend here

>
>I haven’t flown a contest in over two 
>years
Looking to get back in the saddle
I appreciate all the help
.
>
>Larry
>
>PS, Dennis you just want to see my caller LOL

>
>
>
>
>----------
>From: nsrca-discussion-bounces at lists.nsrca.org 
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dennis Bodary
>Sent: Saturday, August 08, 2009 10:31 PM
>To: General pattern discussion
>Subject: Re: [NSRCA-discussion] OS 140RX Need Help
>
>I am assuming this engine has sat for awhile. 
>try injecting some straight methanol into the 
>pump inlet line just in case the oil in the pump 
>is congealed. denatured alchohol will work fine for this.
>Do not take the pump off the backplate thinking 
>you can clean it out. Bad stuff will happen as 
>the backplate is part of the pump you may or may 
>not even be able to put it back together.
>Also try a OS F plug or the YS 4 stroke plug. 
>never had any luck with the A5 plug that came with it.
>Another thought is check the needle valve 
>against a OS61FX if the needle valve looks the 
>same you are okay. If the needle taper part is 
>different try the 61FX needle valve. It may 
>already be in the engine as it comes with the engine as a optional part.
>If all else fails try replacing the rear bearing.
>
>--- On Sat, 8/8/09, Lisa n Larry <lld613 at psci.net> wrote:
>
>From: Lisa n Larry <lld613 at psci.net>
>Subject: [NSRCA-discussion] OS 140RX Need Help
>To: "'General pattern discussion'" <nsrca-discussion at lists.nsrca.org>
>Date: Saturday, August 8, 2009, 9:56 PM
>I’m trying to get a plane going to make the Quincy , OH contest next weekend

>
>When running at idle or the engine isn’t 
>running, fuel leaks out of the carb. I can get 
>it started, but loads up in about ten seconds 
>and bogs down and dies when increasing the throttle

>
>
>If I pinch the fuel line, it leans out and 
>recovers. As long as I stay near full throttle 
>it’s fine
When at half throttle and lower it will bog down
.
>
>HS needle is at about 1-3/4 out leaned from 
>about 2 turns out. I don’t know the pump settings.
>
>This is a used engine already installed in a plane

>
>Is it just a matter of the pump pressure being 
>too high or do I have other problems to deal with
???
>
>Larry Diamond
>NSRCA 3083
>
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