RunRyder RC
WATCH
 1 page 1623 views POST REPLY
HomeAircraftHelicopterMain Discussion › OS 91 SZ and OS Regulator Problems
10-18-2015 06:26 PM  34 months agoPost 1
bzrogers

rrNovice

Dayton OH

My Posts: All  Forum  Topic

I have a nearly brand new OS 91 SZ. It had a cline regulator on it and is using backplate pressure with a check valve. I could never get it to run so I tried an OS regulator and it fired up and ran for a few minutes (long enough to pop up into a hover) then died. Since then I have not been able to even get it to cough.

Currently I have the needles at stock settings 2.5 on high and 1.5 on mid. I also have a brand new OS #8 plug. I tried bypassing my remote start lead to the plug to make sure that wasn't a problem by putting my glow driver directly on the plug. The system is building pressure and will hold that pressure for a long time after I stop turning the engine with my starter. Everything seems like it should be right but it wont run...

This is the first time I have messed with a regulated engine like this. I am at the point of going back to muffler pressure and ditching the regulator. Does anyone have suggestions on what to try?

Cheers
Bret

PM  EMAIL  Attn:RR  Quote
10-18-2015 06:28 PM  34 months agoPost 2
bkervaski

rrElite Veteran

Birmingham, AL, USA

My Posts: All  Forum  Topic

When we used the Cline regulator we had to have the carburetor modified, has yours been modified (it may explain your troubles)?

I think the regulated OS motors have a different carburetor than the standard ones, the cat eye may be wider and the needles and seats are different.

Nothing wrong with muffler pressure, it will just run a little leaner towards the end of the flight so maybe start a little richer than you normally would.

However, if your carb is setup for a regulator you may not be able to get it dialed in like a standard carb (your needles may be WAY off what you expect).

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-19-2015 01:16 AM  34 months agoPost 3
TMoore

rrMaster

Cookeville, TN

My Posts: All  Forum  Topic

I have a nearly brand new OS 91 SZ. It had a cline regulator on it and is using backplate pressure with a check valve. I could never get it to run so I tried an OS regulator and it fired up and ran for a few minutes (long enough to pop up into a hover) then died. Since then I have not been able to even get it to cough.
Currently I have the needles at stock settings 2.5 on high and 1.5 on mid. I also have a brand new OS #8 plug. I tried bypassing my remote start lead to the plug to make sure that wasn't a problem by putting my glow driver directly on the plug. The system is building pressure and will hold that pressure for a long time after I stop turning the engine with my starter. Everything seems like it should be right but it wont run...
This is the first time I have messed with a regulated engine like this. I am at the point of going back to muffler pressure and ditching the regulator. Does anyone have suggestions on what to try?
One engine, two carbs, hmmmm.

1. Is the Cline carb a real Cline Carb from OMI or is it something that someone other than James O'Neal did?
2. Is the engine trashed to the point that it can't run no matter what carb is on it?
3. If the engine isn't trashed and is in good shape, what fuel are you running, how fresh is it and are you absolutely sure the glow plug, even though it's new, are you sure it is glowing?
4. What's the condition of the rear bearing?

Get back to us with the answers.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-19-2015 01:54 AM  34 months agoPost 4
bzrogers

rrNovice

Dayton OH

My Posts: All  Forum  Topic

The first regulator says cline on it. Here is the picture. The valve opens and closes freely

I think the engine is brand new. I bought this heli from a guy with money that bought it and then was too scared to fly it. I haven't pulled the head off but it has good compression and looks clean. It did sit around for several years so I don't know if that hurt anything? This is a flybar version of the TREX.

Here is inside the backplate.

Here is the carb and OS regulator

This helicopter has a carb smart system on it but I have been attempting running it unhooked until I get the engine tuned.

My glowdriver does not have a meter on it so I cannot gaurantee the plug is glowing. I like the ones with the meters on them so I might go get a new one. If I pull the plug and put it in the glow driver then it does glow.

When I pulled the backplate there was plenty of fuel inside of the case. I am running cool power 30%. The fuel has been running great in my OS50 heli hyper.

How easy is it to flood an engine with this type of regulator setup on it?

PM  EMAIL  Attn:RR  Quote
10-19-2015 02:07 AM  34 months agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Which check valve are you using and is it installed correctly?

I have been running an OS 91 SX-H C-Spec with an OMI installed Cline regulator for years. It's really a trouble-free setup.

As Terry asked, is the motor itself OK?

-----
Dave

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

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-19-2015 02:16 AM  34 months agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

That carb installation looks bizarre. What carb is it?

-----
Dave

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

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-19-2015 02:18 AM  34 months agoPost 7
jbjones

rrVeteran

Columbus, Mississippi

My Posts: All  Forum  Topic

If it were me, the first thing I'd do is pull that motor anyway...look at the bearings..maybe replace them. The big deal is to replace the piston with an HZ piston. The SZ is a known "jackhammer". You'll be much happier with a smoother engine, trust me.

I had a pumped SZ, and while it is a good engine, it does hit pretty hard. I know you'll find a lot on that motor here in past posts. Dr. Ben had a lot of good info on it years ago. For me, the HZ piston really smoothed it out. Others went whole-hog, and replaced the crank as well. Your mileage (wallet) may vary.

Good luck. Hope you get to enjoying your new machine soon.

-JB

J. B. Jones

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-19-2015 02:44 AM  34 months agoPost 8
bzrogers

rrNovice

Dayton OH

My Posts: All  Forum  Topic

I pulled the carb off it is a 60M. I can't tell if anything has been to modify the fuel passages??? The needles look stock. Nothing looks like the needles were modified.

Here is the end piece it looks very stock/clean and is symmetrical. If it was modified it was machined and not done by hand.

On the larger drum it looks clean/stock also. The cut is not symmetrical. I don't know if this was modified or not?

The bearings are fine and the engine turns smoothly. Like I said I think this is a brand new engine. I will worry about replacing the piston when I have too. When the engine actually started it was smooth.

PM  EMAIL  Attn:RR  Quote
10-19-2015 02:50 AM  34 months agoPost 9
jbjones

rrVeteran

Columbus, Mississippi

My Posts: All  Forum  Topic

bzrogers: The bearings are fine and the engine turns smoothly.
Good deal.
.. Like I said I think this is a brand new engine.
It certainly looks like it!
I will worry about replacing the piston when I have too. When the engine actually started it was smooth.
Totally up to you, but when it gets up to flight RPM, that motor is known to cause a fair amount of vibrations. Just a heads-up. Happy flying, man.

-JB

J. B. Jones

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-19-2015 04:22 AM  34 months agoPost 10
TMoore

rrMaster

Cookeville, TN

My Posts: All  Forum  Topic

The barrel doesn't get modded but the jet does as do the needle seats.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-19-2015 12:17 PM  34 months agoPost 11
excellone

rrApprentice

Arlington, Virginia

My Posts: All  Forum  Topic

Try another source of fuel
Fuel can be contaminated with moisture and cause this to happen. Try another source.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-19-2015 02:28 PM  34 months agoPost 12
wjvail

rrKey Veteran

Meridian, Mississippi

My Posts: All  Forum  Topic

A couple of notes:

-- An engine using both Jim Cline's regulator and OS's DRS system must draw fuel. There must be enough vacuum to pull fuel from the regulator. While this doesn't have to be major suction, any stickiness in the regulator will prevent it from opening properly. The diaphragm in Jim's regulator is a Walbro and will tolerate a large variety of fuels. OS's diaphragm is silicone and will be damaged by petroleum.

You should be able to inflate the tank or otherwise put pressure to the regulator and be able to pull fuel from the carburetor.

-- I ran an SZ for a very short while before I decided it was going to destroy my heli. The vibration levels were unacceptable. I replaced the crank, piston, and wrist pin. My engine also shipped with OS's pump and regulator. Not the DRS system. Mine had the pump and regulator. These also got striped and replaced. So while I flew the engine this weekend and have to admit it really is a sweetheart, it cost about $700.

When in doubt, try a new OS #8 plug and fresh fuel. They are quick and easy to change and these two steps fix many of the problems I see.

Bill

"Well, Nothing bad can happen now."

PM  EMAIL  GALLERY  Attn:RR  Quote
10-19-2015 02:47 PM  34 months agoPost 13
TMoore

rrMaster

Cookeville, TN

My Posts: All  Forum  Topic

Looking at the cateye's on the barrel won't do it. That's not what needs to be looked at here. Is the OS Carb a regulator carb or has the OS regulator been added? Was the Cline an OMI unit or was it added?

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-19-2015 06:45 PM  34 months agoPost 14
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

Mismatched parts will make it run like crap. If it is not firing at all, then the regulator is stuck shut. Or you don't have it plumbed correctly.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-13-2015 03:08 AM  32 months agoPost 15
Iflyglow

rrNovice

Clintonville

My Posts: All  Forum  Topic

Cline Regulater
Anyone looking for a new Cline regulater? I have one new in the package. I have been useing them in planes since the 90's.

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 1623 views POST REPLY
HomeAircraftHelicopterMain Discussion › OS 91 SZ and OS Regulator Problems
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Sunday, August 19 - 2:45 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online