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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › NEW OS 1.05 Heli Engine
01-24-2012 03:03 PM  6 years agoPost 201
unclejane

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santa fe, NM, USA

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Nice pics! Does the velocity stack fit under the fan shroud without any grinding or cutting? That looks like the only thing that's a close fit (on the trex 700N, which I assume this is? Looks like mine ))...

LS

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01-24-2012 03:28 PM  6 years agoPost 202
pitch black

rrApprentice

Singapore

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Copy that Steve.
I'll probably just replace the bearings when I can.

Only issue is, the 105 is in my Kasama 90N, and removing the backplate is a pain. I just might use a needle syringe and squirt some through the pressure nipple.

Slope Soaring not a Crime

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01-24-2012 03:34 PM  6 years agoPost 203
Skaluf

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Champaign, IL

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Copy that Steve.
I'll probably just replace the bearings when I can.
Only issue is, the 105 is in my Kasama 90N, and removing the backplate is a pain. I just might use a needle syringe and squirt some through the pressure nipple.
Going in through the pressure nipple works fine. Put it in while the shaft is pointing down so that the oil makes it to the bearings. Might want to bump it with your starter to distribute the oil further.

You will love the power this engine produces!

Steve

Steve Kaluf
Hobbico

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01-24-2012 04:12 PM  6 years agoPost 204
GKO1

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Crosby, Texas

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105
I have a YS 120 and I'm waiting on the 105 HZ-R. I've been mixing my own fuel for many years and I've used oil percentages as low as 8% up to 23%. I've never had an engine failure to date. I've been a YS guy a long time but have always had both OS and YS. I was really excited when I first heard about the YS 120. When I got it I mixed up some 15% nitro and ran it pretty fat the first several tanks and didn't load the motor hard. When it came time to start leaning it I started slowly trying to get the mixture dialed in. To keep this somewhat short, this engine has been the biggest disappointment I've had in any engine I've ever owned. It won't hold a tune, it changes from the beginning of a tank to the end of the tank and from day to day. I think YS should have done some more R&D on this engine.

Also, I mixed up some 45% and ran it in both YS and OS 91's, and you can tell a significant difference in power increase with the higher nitro content but both still held their tune and the reliability was the same from idle to full throttle. And if you have to run the 120 on less nitro you're basically removing power, so I would think it would be better to have higher nitro content for the added power and still maintain reliability.

I realize I'm going to get some replies about how stupid this sounds but I'm just saying what my experience has been with my 120. Oh, and in regards to oil content, if you run a fuel that uses a lower viscosity oil, then yes, you need a higher content. I still have an OS C-Spec 91 that has had 9% oil run through it for the life of the engine and it still runs just as good now as the day it was new and I've never changed bearings in it. The debate on fuel and oil and how it affects reliability and life of a motor have been going on since I've been around nitro engines going back to the early 70's with boat racing. I suspect it won't be going away any time soon.

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01-24-2012 07:21 PM  6 years agoPost 205
carcrasher

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east coast

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+1 ^
When I don't fly for sometime I like to put a few drops of after-run in the engine. It's good practice especially if you live in a humid place or store your helis in a basement.

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01-24-2012 09:16 PM  6 years agoPost 206
Glenn Goodlett

rrApprentice

California

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@ GK01

I feel your pain with respect to the YS 1.20. I was excited as hell when I finally got the motor and proceeded to break it in uneventfully. But when trying to tune the thing, it was all over the place. It would go from fat to thin by the minute, so I replaced the fuel lines twice, magnet, check valve, fuel tank, glow plugs (Enya 5), balanced everything, and tried every imaginable needle setting combination. This went on for a week, everyday like a full time job. I finally said screw this and put the perfect running OS 91 Hzr back in and flew.

Then the wife said "it's not you, there is probably something wrong with that motor, try the other one." When the 1.20 was available, I got two of them. Reluctantly, I went ahead and put the other new 1.20 in and proceeded to break-in. I started tuning for power and it has been running like a bat out of hell every since. I rarely touch the needles, just fly.

I still have no idea what is wrong with my origional 1.20, but something ain't right.

Now back to the thread topic. Sorry for high jacking.

Glenn

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01-24-2012 10:16 PM  6 years agoPost 207
carcrasher

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east coast

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Did you take apart the regulator to see if anything was inside of it i.e. dirt, silicon, and etc?

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01-25-2012 03:05 AM  6 years agoPost 208
Tyler Benson

rrKey Veteran

Louisiana usa

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yes i did have to trim the fan shroud! but not very much maybe 3/16 of an inch or so

Team Ready Heli
Team Gaui USA/ Empirerc.com

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01-27-2012 05:52 AM  6 years agoPost 209
Tyler Benson

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Louisiana usa

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tank #4! i leaned it out 5 clicks on the high speed needle and 3 on the mid 1700 HS and 14 degrees of pitch and I like it a lot!,smooth power I might just keep it at 1700 hs idle 1 and 1950 hs idle 2. One thing I noticed about this motor is that it has a wider and smoother power band,the transition from the high to the mid is a lot smoother also. tomorrow for lunch I might get the fifth and final tank for break-in and then put it in to idle 2 and see how it feels power wise when the rpm is closer to the power band.it's gonna be insane!. I hope the weather is nice this weekend because i really want to get tuning on this thing in!

Team Ready Heli
Team Gaui USA/ Empirerc.com

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01-30-2012 03:26 AM  6 years agoPost 210
Tyler Benson

rrKey Veteran

Louisiana usa

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Ok 7min at 2050rpm im gonna see what the flight times are at 1850-1900 wich i like better than 2050. 30% vs 15% nitro,im thinking that it's gonna have even more power on 15% vs 30% because of compresion reasons,if you follow the ys120 treads they ran it on 30% (with a second shim) and 15%(stock) and they found that it ran and tuned better on 15% vs 30 because the compesion ratio is better with the 15% nitro

all in all!,im verry happy with the new motor and can't wait to try the suggested nitro %

OS 105HZ-R + Hatori 105 muffler and rotorrage 30% nitro

Watch at YouTube

Team Ready Heli
Team Gaui USA/ Empirerc.com

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › NEW OS 1.05 Heli Engine
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