[NSRCA-discussion] OS 140RX Need Help

Sun Aug 9 09:43:57 AKDT 2009

Don't pull the wrist pin.  Unless this part is really gummed up, don't  
bother.  The rough feeling bearing is a sign you're moving in the right  
direction.

In a message dated 8/9/2009 1:25:39 P.M. Eastern Daylight Time,  
lld613 at psci.net writes:

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:

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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_ (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

61FX needle is longer  than the one on 70A.

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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