[NSRCA-discussion] OS 140RX Need Help

Sun Aug 9 09:24:59 AKDT 2009

OK.as I said, I haven't done this before.

I've removed the clip from the wrist pin in the piston.

What's the trick to pulling the wrist pin? Is it threaded for a screw?

If yes, what size.I'm assuming metric.

Since I have the bearing, I'm going to replace it.Once I had the prop off,
it does feel very rough.Couldn't tell it with the prop on and rolling it
back and forth.

I'll adjust the LE needle once I put it back together if needed.

The previous owner sent me an e-mail this morning and said he it was running
fine last fall. He also gave be a main bearing and other parts as well.
Based on all the info, I'm replacing the bearing before I start with
adjusting the LE..

Larry

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Phil Spelt
Sent: Sunday, August 09, 2009 11:55 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] OS 140RX Need Help

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"
Content-Language: en-us

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>
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
bearing <http://www.rcuniverse.com/buynow/keywordclick.cfm?bid_id=6534>
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>
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>
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>
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>
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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--> There are only two types of aircraft -- fighters and targets.

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