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Author Topic: OS 105 pumped Rich-Lean -Rich  (Read 5512 times)

Offline Kevin Feil

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OS 105 pumped Rich-Lean -Rich
« on: June 01, 2014, 07:43:08 PM »
Guy's this May be a topic that has been discussed already but just know that it has been and is an issue for some. I have heard of several people experiencing troubles regarding there Regulated OS105's going Lean on them. Well i actually had this happen last weekend. I currently am running V curves in my #1 N7. With that being said, this machine has been running flawlessly on CP 15%. With the temperature increases in Georgia last weekend I backed the needles (1) click each on low and mid (Ran/Pulled strong) 2ND to the last flight I noticed the motor hunting regarding Mixture (Rich/Lean) I brought it back in and rich ended it just 1 click each and looked for any signs that could attribute to this sparattic condition.(even checked the cooling fan " Habit")  now I'm running the stock clunk which normally I don't do, however I haven't changed it. With 1.25 gallons of fuel run through this machine, all is in order.
 I removed the regulator an completely disassembled it, nothing out of order there (diaphragm is intact and all parts clean and in order)  I have a theory of what may be going on based on my experience with Standard carbs and Pressure Carbs, I understand them very well, and the one thing that I question is the "Spring Tension" under the needle Arm. I removed mine and cut 1 coil out of it and reinstalled with the (cut side) seated in the recess of the regulator body. In doing this I decreased the tension which allows the diaphragm the ability to depress the arm with less resistance to allow more fuel. This is a method that is common on Jet Ski carbs when setting pop off pressure , when you can't find the correct spring to set it.  I had the chance to fly it today and reset my needles to where they were and had great results. I'm not saying this is everyone's problem, I advise you to run a proffered fuel clunk, check your clunk line, and most of all when you remove the pressure line from your tank ( Make sure you have pressure)!!! If you don't, I suggest you source other methods of diagnosis like your check valve!!! But for those that have carefully looked there machine over and are still stumped, this may be the solution. Feel free to Email me if you have questions hwood3160@yahoo.com , it is easier for me to respond this way and even more willing to talk on the phone, Good luck and don't give up on your Regulated OS just yet. I will say that there is no set formula for figuring out how many coils to cut, and that if your comfortable knowing that you have exhausted all other avenues and are willing to try this, I advise to make small adjustments and test accordingly. Don't get carried away and cut to much, I'm not even sure you can buy a spring?? Again this worked for me, Variances in field elevations/altitude may effect your results.


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Kevin
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Offline Jeff_Barrett

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #1 on: July 13, 2014, 07:02:10 PM »
I had a similar issue, where mine would just run rich all the time even with both screws all the way closed.

I took the regulator apart and discovered the needle was sticking in the orifice every now and again. I cleaned everything up nice and gentle with isopropyl alcohol and put it back together. It's been running great ever since.
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Offline Chris Wall

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #2 on: July 13, 2014, 09:15:59 PM »
Interesting, I might try this as I bought a whole new regulator (so I have a spare spring)!
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Offline Steve Graham

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #3 on: July 17, 2014, 03:33:22 PM »
I also have had some lean runs with my 105 regulated engine.  Historically these could be traced back to cuts in the clunk line where it attaches to the through tank fitting.  The last time it happened I had new clunk line in the tank and it was good even after checking it.  Since I had quite a bit of air in the filter after the engine quit I suspected the Align plastic filter I was using might be to blame.  After testing I still couldn't find a crack OR a leak in the filter but I replaced it anyway with a Sullivan Crap Trap and it has several consistent runs on it since.  I really don't know if I fixed anything by changing the filter or if the issue will re-occur?  Generally the regulated systems have been very good for me in about two years of flying them but occasionally you get something hard to diagnose.  If the problem comes back I may take a closer look at the regulator.
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Offline Kevin Dalrymple

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #4 on: August 09, 2014, 09:31:09 PM »
Well if you have not heard OS had a fix for this problem, a new high needle seat. They found that the seat had been miss machined and causes a problem with the suction on the regulator.

The regulator dose not need to be replaced. And OS is giving away the new seats to people how have the rich lean condition. I got mine at IRCHA from OS.
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Offline Rodney Kirstine

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #5 on: August 09, 2014, 09:40:53 PM »
I wonder how someone not at ircha can get a replacement?  Mine is definitely one of the affected ones.
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Offline Kevin Dalrymple

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #6 on: August 09, 2014, 09:44:26 PM »
I would email hobbico and ask them. They will probably nail you one.
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Offline Rodney Kirstine

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #7 on: August 10, 2014, 03:07:43 PM »
I looked on the O.S. website (duh, huh?) and found an email address.  I sent them an email today and I'll see what they say.  The email address btw, if anyone else wants to email them, is enginesupport@greatplanes.com

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Offline Chuck Bole

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #8 on: August 11, 2014, 11:59:22 AM »
 I got my 105 used but rebuilt from Kevin. I heard there was someone from Hobbico (I think) passing out seats or something at Ircha. Matt flew mine to check it out Thursday, it ran great. Hope you get this worked out. Been a long time since i flew nitro and this engine has me spoiled.

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Offline Jeff_Barrett

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #9 on: August 12, 2014, 10:35:01 AM »
Steve was handing out the seats at IRCHA.

I grabbed one for mine and will install it this week. From what I understand, the metering hole in the seat was machined oversized and this is causing the rich condition and making it difficult to meter the fuel.
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Offline Chris Wall

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #10 on: August 13, 2014, 12:01:20 AM »
I looked on the O.S. website (duh, huh?) and found an email address.  I sent them an email today and I'll see what they say.  The email address btw, if anyone else wants to email them, is enginesupport@greatplanes.com

I have emailed them previously, it takes a while for a response (seemed like at least a week), so be patient...
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Offline Rodney Kirstine

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #11 on: August 13, 2014, 09:36:26 AM »
I have emailed them previously, it takes a while for a response (seemed like at least a week), so be patient...

Thanks!  That's good to know because I haven't heard back yet and I was starting to wonder.
Rodney

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Offline Rodney Kirstine

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #12 on: August 14, 2014, 03:24:56 PM »
So, I waited the better part of a week for the reply and the response was "Send your motor to us and we'll determine if it's a warranty issue and proceed from there".   :o

I'd just go ahead and order a new needle valve holder but I want to make sure I get the new one.
« Last Edit: August 14, 2014, 03:46:30 PM by RodneyK »
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Offline Chris Wall

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #13 on: August 14, 2014, 08:41:16 PM »
So, I waited the better part of a week for the reply and the response was "Send your motor to us and we'll determine if it's a warranty issue and proceed from there".   :o

I'd just go ahead and order a new needle valve holder but I want to make sure I get the new one.

I with you on that one!  If you find a new part number, or somewhere to get the right one - please post!  I have the same question to them...  Kind of funny that they are handing them out at IRCHA, but ask support and they say send motor in.
« Last Edit: August 14, 2014, 08:43:23 PM by cwall64 »
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Offline Rodney Kirstine

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Re: OS 105 pumped Rich-Lean -Rich
« Reply #14 on: August 14, 2014, 08:51:55 PM »
I sent them a reply mentioning that Steve Kaluf was handing out replacements at IRCHA because it's a known issue.  We'll see what they come back with.  I'll let you know what I find out.
Rodney

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