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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Another os50 hyper with problem
07-23-2006 08:39 PM  14 years ago
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sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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Another os50 hyper with problem
Hi guys! I have a problem with my 50 hyper. To have it running not very hot I need to open the main needle more than 2 turns and low needle much more than neutral position. By saying not very hot I mean 4-5 second with my finger on the backplate. Such settings make me worry, because everybody else have it about 1,5 turn or less.
I have an evo50 with funtech muffler and tj pro set to about 1700 in normal mode and to 1950 in stunt mode. The fuel is CP20% heli. Glow plugs, I tried, are os 8 and enya 3. Changed all the fuel lines and clunk lines. Muffler bolted tight with some epoxy as gasket. All the bolts on the engine are tight. The engine is about 6 gallons.
Two things come to my mind:
1) I had some quite lean runs in the past, because I had problems with heli vibrating and fuel foaming. Could it be the symptom, that my liner, piston and ring are shot?
2) Guys at local moto shop recommended me to open the muffler port a bit, because on funtech muffler it is really small. So I did so. Maybe this is the reason. I will try my stock hirobo muffler soon.
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07-23-2006 08:58 PM  14 years ago
sir777

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I've also tried some RTV on the carb o-ring, as one member here (turboomni) suggested, but it didn't help.
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07-23-2006 09:22 PM  14 years ago
RC NEW KID

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Atlanta, GA

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Did you check to make sure that the bolts the hold the hyper head on are tight? I have heard this could cause a learn run.Raptor 50 v2, OS 50, MX-400, Blade CP,,,Futaba 9chp, GV-1 gov., OS Hyper 50, JK SB-50 pipe, 9451
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07-23-2006 09:23 PM  14 years ago
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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Yeah, all the bolts on the engine are tight!
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07-24-2006 02:43 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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Not familair with that muffler but 20 percent and a restrictive muffler don't sound like a winning combo for a hyper.Andy
AMA 77227
http://www.jaxrc.com
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07-24-2006 03:02 PM  14 years ago
Jafa

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Sydney, Australia

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It does sound too hot for such a rich setting

Strip the carb and blast it clean
Use carb & brake clean from a spray can

Check the tank bung for pin holes or signs of deterioation

The foaming will give lean running symptoms - sort the run out

Make sure the exhaust pressure is not escaping,
that will cause a lean condition also

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
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07-24-2006 03:04 PM  14 years ago
deafheliflyer

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Arizona

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hi
Use 30% cool power and see what happens.
Crash-Prone and overcoming it!!!
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07-24-2006 06:07 PM  14 years ago
vavavoom

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London, England

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I second what Jafa says, Check the fuel tank for very small leaks.
They may not leak fuel but will lose pressure.
Remove the tank,submerge it in water and blow into into it while sealing off the other hole.
What you describe is a classic symptom of a leaky tank and it is common for the tanks to leak at the front positioning lugs
If it is , seal it with a hot soldering iron and some plastic milk container material
## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad
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07-25-2006 11:01 PM  14 years ago
sir777

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Thanks for answers. I'll give it a try.
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08-04-2006 03:02 AM  14 years ago
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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Guys, I've tried everything, but no result. I am going to buy a new os50hyper and a hatori 3d muffler (521).
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08-04-2006 04:24 AM  14 years ago
Jafa

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Sydney, Australia

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You could borrow a carb from a friend,
I doubt that it's an engine problem,
if all else is ok it has to be the fuel or the carb

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
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08-04-2006 04:45 AM  14 years ago
RC NEW KID

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Atlanta, GA

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would you like to sale the head and carb off your old hyper?Raptor 50 v2, OS 50, MX-400, Blade CP,,,Futaba 9chp, GV-1 gov., OS Hyper 50, JK SB-50 pipe, 9451
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08-04-2006 05:20 AM  14 years ago
Helibras

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São Paulo, Brazil

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Check the fuel filter, see if air flows free in it. I saw brand new ones that didn't... bad design!

I have the same combination of engine, muffler and fuel. I'm runnin 2 click over 1 1/2 turn and never touched the header intake wich is restrictive indeed. My powertrain is insane!!

Love this muffler

BTW.: The funtech seems to like higher engine speeds so I'm planning to play with the TJ setup, now running 2k at idle2

Gravity... the force to be defeated
Raptor 50SE; Hyper
Vigor CS; OS 91C-Spec MPII
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08-04-2006 09:17 PM  14 years ago
nguyen23464

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Suwanee, GA

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can i ask a simple question if you guys dont mind?

Are you turning and checking the backplate after it already got hot? If the engine is already hot, richening it and checking it after wards wont give you an accurate reading at all, it will still feel hot after the run.

You have to let the engine sit and cool for a while, or flood the engine on purpose too cool it off first.


Jamie
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08-04-2006 10:27 PM  14 years ago
Herc

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Cranbrook, BC - Canada

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Jamie,

Wouldn't flying cause the engine to cool down at least to the the same temperature as the new running temp? Because of airflow. Unless, of course, it was extremely hot. I ask because I use a temp gauge on the head (Venom) and it reacts very quickly to temp change. Or is it just that the backplate takes awhile to coold down?

Cheers, Shayne
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08-05-2006 02:54 AM  14 years ago
Helibras

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São Paulo, Brazil

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I usually do some circuits and so before rechecking the temperature. Theses circuits also show me the engine reaction which tells more than temperature itself
Gravity... the force to be defeated
Raptor 50SE; Hyper
Vigor CS; OS 91C-Spec MPII
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08-05-2006 02:58 AM  14 years ago
Helibras

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São Paulo, Brazil

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Sir777

Today I set the TJ speed for Idle 2 at about 2100 rpm which is 17850 on engine. It behaves much better, very tuned and smooth and never bogged. Flips and rolls very easy and also make me feel confident to try some tic-tocs. Huge power!!

Gravity... the force to be defeated
Raptor 50SE; Hyper
Vigor CS; OS 91C-Spec MPII
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08-05-2006 09:51 PM  14 years ago
nguyen23464

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Suwanee, GA

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Wouldn't flying cause the engine to cool down at least to the the same temperature as the new running temp? Because of airflow. Unless, of course, it was extremely hot. I ask because I use a temp gauge on the head (Venom) and it reacts very quickly to temp change. Or is it just that the backplate takes awhile to coold down?
I meant when its very hot. Normal temp changes is suffiecient. Temp gun is a diffrent story. I was pretty much reffering to the finger backplate method of checking.
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08-07-2006 11:02 PM  14 years ago
sir777

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Moscow, Russia + Lloret de Mar (Girona), Spain

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Hi again, guys! Thank you for your answers. Sorry, that I didn't answer, cause I am on vacation now. I've already ordered a new os 50 hyper and a hatori 521. When I receive them, I will swap carbs and I will try to do the following (I can always sell the new engine and the muffler):
1. new carb with funtech muffler
2.old carb with hatori muffler
3. new carb with hatori muffler

That way I think I will be able to find where the problem is exactly. Maybe it is also bad fuel, I'll try something else.

As for checking backplate temperature, I do it that way: start the engine, fly it for about 3-4 minutes (quite hard) and then quickly land it and check the backplate. If it is very hot, I shut it down, wait sometime to cool it down, richen the needle and start over again. I think, this way I will have quite accurate readings. I think I am going to buy a temp gauge also.

Helibras

I also have a tj pro and I will try higher headspeed, when I get the metal head, I've just ordered.
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08-23-2006 07:26 PM  14 years ago
w.pasman

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Netherlands

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And, did you test?

Running it with 2 turns open WILL make it run hot, at least with my OS50. You really need to set it at 1.5 turns after running in.

And you need a good muffler. If the muffler is restrictive or giving gas reflections back into the engine, it will also run hot

Finally it may be that your rear bearing is broken, plug is broken, have a tiny leak somewhere, etc as already mentioned.
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Another os50 hyper with problem
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