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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › OS. .61 SX-H WC tuning and runnning problem
06-07-2015 06:25 AM  4 years ago
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GEORDAN

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Roseville , California

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OS. .61 SX-H WC tuning and runnning problem
Hello Run Ryder PLEASE HELP if you can !!I have a new OS. .61 SX-H WC engine with the Curtis Youngblood Muscle Pipe for that particular helicopter. I started out with 2 turns out on low , One turn on mid ..and two turns on High Speed needle (as the book says to do ). I'm running PM 20/20 in it. Also running Futaba GV-1 Gov. The issue is when I pop into a hover it runs fantastic until it starts to get warm. Then the RPM tries to climb slightly (but still getting good smoke) ...and the engine starts to run very poorly ..the tail kicks and the engine starts to sputter a bit ...then just dies and I have to auto down. I have tried to adjust the needles slightly. ...like leaning out the mid a bit ..and the high... I have also tried richening up the high... It seems like no mattwer what Ido... the engine does this... Only after it warms up.. It is not real hot right after it quits either ...temped at like 156- 159 or so every time... The engine has a bit of trouble spooling up ...but once it clears out it seems to rum OK.. (maybe too rich ? ) ....any way any help out there would be fantastic .. Plug used is OS #8 too
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06-07-2015 08:21 AM  4 years ago
Santiago P

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Dayton

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It is very posible the engine is shimmed for 10-15% fuel and once it gets warm, begins to detonate and overheats. When it detonates, the exhaust note changes drastically and the snoke will drecrease.

Try adding .004 shim if you think that is what is happening.

Also, make sure you have no pressure leaks in the tank or fuel lines.

S
Team Minicopter - PeakAircraft.com
FUTABA.USA - Team Kontronik - Scorpion Motors-
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06-07-2015 11:31 AM  4 years ago
JuanRodriguez

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The Villages, Florida

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Is your fuel fresh ??

"old" fuel can cause a tremendous amount of grief.....

Also, if you can, try an Enya #3 plug instead of that OS #8
Been there, done that and old enough to know better.....
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06-07-2015 12:44 PM  4 years ago
Eury

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Dover NH USA

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Sounds like an air leak to me. A lot of time they won't show up untilthings heat up. Maybe the muffler is slightly loose, head or back plate bolts not tight, oring on carb damaged. Or as said above some issue leaking air into the fuel system.Nick Crego

Citizen #0168
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06-07-2015 01:40 PM  4 years ago
wjvail

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Meridian, Mississippi

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You are running a "vintage" engine suggesting your entire "rig" might not be new. Have you check the clunk line? A pin hole or crack there will drive you nuts. Fuel tubing is cheep and easy to replace.

How old is your engine and helicopter?

Cheers,

Bill
"Well, nothing bad can happen now."
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06-07-2015 09:52 PM  4 years ago
airdodger

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Johnston USA

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New out of the box, never been run before?
What is your hovering headspeed?
Chris
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06-07-2015 11:23 PM  4 years ago
GEORDAN

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Roseville , California

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Hey guys thanks for all of the responses to my issue. I will check for air leaks and try leaning things out a bit. To clarify The engine is brand new (came in box with carb separated. I am running Powermastwer 20/20 YS fuel. I have the headspeed set for 1300 at the moment But I have tried 1400...and I Never run 30% fuel. I want my engines to last. The Helicopter is a JR Vigor CS that has been completely restored ..all bearings, seals , fuel lines and a lot of the parts are brand new. I have another Vigor with this same engine and it seems to run just fine most of the time,,.. I will also try that Enya #3 that was suggested. I will keep everyone posted with my progress ....thanks so much everyone
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06-07-2015 11:55 PM  4 years ago
airdodger

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Johnston USA

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At that low a headspeed the engine needs to rich, you are loading the engine and no air movement from flying. It would be easier on the engine to get the speed up around 1600. I would also turn off the gov until you get the needles set.Chris
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06-08-2015 01:17 AM  4 years ago
thtoyman

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Gone ,Flying.

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sound like it need some breakin time
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06-08-2015 01:32 AM  4 years ago
payne1967

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uk

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if it has any metal fuel lines into the tank
i'd check them very carefully
i had the same engine play up from new and it turned out to be a crack in the brass fuel tank tube
the crack was right through the length of the bung so it couldn't be seen until the tube was removed
www.alcesterhelicopterclub.bmfa.org
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06-08-2015 01:49 AM  4 years ago
JuanRodriguez

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The Villages, Florida

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^^^^^
That reminds me of an incident I had a few yrs ago with an OS 50 Hyper...... Similar scenario to the OP 's problem .... In my case the problem turned out to be a metal "sliver" stuck inside the clunk that was left there by the manufacturing process. When the sliver was in the right position , it would restrict the fuel flow and cause a lean run ..... Sometimes the motor would run just fine and then without warning, lean run ....I (we) scratched our heads for quite a while until discovering the issue...... After that , the motor ran fine but was lacking power ....cause for the power loss ??? = scored piston and sleeve......

So, it might be far fetched but carefully check your fuel dilivery system for any obstructions, including the filter if you use one .....
Been there, done that and old enough to know better.....
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06-08-2015 02:04 AM  4 years ago
Cobra 46

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Cambridge il usa

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Just sounds rich to me !
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06-08-2015 05:10 AM  4 years ago
dkshema

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Cedar Rapids, IA

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Disable the governor, tune the needles for proper behavior, then break-in the motor. Then worry about governor setup and operation.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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06-11-2015 03:50 PM  4 years ago
Agilefalcon

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Fort Worth, Texas

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I'm with Dave:
Forget the governor for now.
Also on head speed, get it up to a minimum of 1600rpm - the .61 is a high revving engine, let it unload and cool down.

Chris
Chris Berardi
Team BobbyJack's Hobbies
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06-22-2015 05:27 AM  4 years ago
GEORDAN

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Roseville , California

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Hello Run Ryder !! I just wanted to update on my engine issue. I took the governor out of the equation ..as suggested.. also just set throttle curve to spec.. for normal flight in the JR VIGOR CS Manual. Set the needles to factory spec..as suggested.. and ran engine ... It was too rich.. so I backed up the HIGH 4 clicks and the MID 5 clicks or so... The head speed was noticeably higher and the engine seemed to unload and run well (in a hover)... I got through about 3/4 of a tank with a good smoke trail... the smoke started to get kind of thicker and dense ..as the temperature increased I'm guessing. The engine seemed to get a little sputtery ..(there was a short cut out and tail kick) but it kept on running. This was a VAST improvement from before...BUT... Why the smoke change ?? Was this detonation ?? Too hot?? ...any more imput would be great.... We are getting closer for sure .. I also checked the carb seat for leaks and inspected the O ring ..and all fuel lines.. for air leaks.... thanks for all the GREAT HELP out there guys !!! Geordan
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06-22-2015 05:34 AM  4 years ago
GEORDAN

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Roseville , California

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AHHH And one more addendum ... I ordered some Enya #3 plugs as well ... Peace out !! G
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06-22-2015 11:56 AM  4 years ago
Rob43

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Midland, MI USA

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I wasn't so sure on the Enya #3. If, as Santiago suggested, it's detonating, the Enya #3 will make it worse. It's a slight bit hotter plug than the OS #8. The Enya #4 is a tad cooler than the OS #8.

I guess I am wondering about the o-rings on the needles in the carb...if maybe their condition isn't best. That engine sat in the box for a long time.
Rob
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06-22-2015 02:33 PM  4 years ago
GEORDAN

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Roseville , California

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OS .61SX-H "WC" tuning issue
Man we are the same page.. I just ordered new needles .. I pulled out the needles and sure enough the "O" rings were still in tact .. But.. They are disintegrating and leaving black crud all in the needle throats... The O rings are ... done... I will replace them and we will go from there. Thanks for the fast response bro !! .. Best... G
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06-22-2015 05:09 PM  4 years ago
Rob43

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Midland, MI USA

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Rob
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06-22-2015 10:43 PM  4 years ago
airdodger

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Johnston USA

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A hotter plug is usually better because you can run the engine richer. Enya 3,4 are good choices. I have seen numerous engines ruined because of a cool plug and the next move is the person leans the mixture to get the engine to run clean causing a lean run damaging engine. Always better to use the hottest plug and more fuel, you will also get more power form the added fuel burn. A hotter plug has little to do with detonation..Chris
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › OS. .61 SX-H WC tuning and runnning problem
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