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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Os 105hzr not getting up to speed
01-13-2013 08:04 PM  7 years ago
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rilopez825

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Pembroke Pines, FL

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Os 105hzr not getting up to speed
I broke in the 105 with the recommended settings and now trying to tune the motor if I use the 2 1/2 turned high and 1 turn medium. I can only get 1780 rpms. Even without the governor.
Now I have 1 turn open on high needle and a little over half on the medium needle. The motor is now hitting 1950 rpms even with a flat 100% curve.
The motor has no power at all. I can bog it easily.

The temp was at 170
Please help me thanks
Richard
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01-13-2013 09:06 PM  7 years ago
McKrackin

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Lucasville,Ohio

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Still too rich believe it or not.

What elevation are you at?

I have heard of the OS105 needing to be tuned really tight.
One guy here has the mid range needle all but closed and about one half turn on the high.
I literally never use the word literally right.
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01-14-2013 01:10 AM  7 years ago
rilopez825

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Pembroke Pines, FL

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Wow that's crazy. I am used to my old 91 it was default settings it's whole life.
I will give it a shot closing them up even more.
It is pooring smoke throughout the whole flight.

I am at sea level. Funny that question never comes up around here.
Thank you
Richard
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01-14-2013 01:24 AM  7 years ago
McKrackin

rrProfessor

Lucasville,Ohio

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You're within a few clicks of good.

I run mine at 185 degrees and it screams.
Still a bit rich but no need to push it...loads of power.
I literally never use the word literally right.
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01-14-2013 01:25 AM  7 years ago
McKrackin

rrProfessor

Lucasville,Ohio

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I'm 1 1/4 turn out...pretty sure.

About 5/8 on the mid.

My elevation is around 1000 feet.
I literally never use the word literally right.
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01-14-2013 02:26 AM  7 years ago
777ER

rrApprentice

Westchester county, NY, USA

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Which heli is this in and what's your pitch range?-Chris
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01-15-2013 06:51 PM  7 years ago
rilopez825

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Pembroke Pines, FL

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Sorry I haven't replied. Busy at work. I at sea level and run 13/-13 pitch.
I am going to keep closing them as you guys have and recommend. If it still doesn't work I am pulling the regulator from my ..91 3d speed and trying that on there.
If it still runs rich its going back to os
Richard
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01-17-2013 10:56 AM  7 years ago
P Andreoli

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new york

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at same elevation
I'm running mine from what i remember 3/4 of a turn on the mid and id say 1.4-1.6 turns on the high, what Gov are you running?

what i tended to notice about the 105 (at least on 23.5 Power Master fuel) is that if you run the motor on the rich side it performs better and you get a much smoother run. once you get the motor issue all figured out try leaning the mid more so then the high (from your previous setting) your 105 will be a whole lot happier and even when its a little on the rich side it will perform great!
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01-21-2013 01:40 PM  7 years ago
rilopez825

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Pembroke Pines, FL

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whoohoo. I GOT IT. Man it flies really well now. Not sure of how many turns it is yet but it is making good power at 2050hs with the stock 8.2 gear ratio.

I could not bog it for nothing. I am considering lowering the gear ratio. not sure if 8.1 or 7.8 yet.
Richard
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01-21-2013 02:08 PM  7 years ago
McKrackin

rrProfessor

Lucasville,Ohio

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Awesome!I literally never use the word literally right.
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01-21-2013 02:25 PM  7 years ago
rilopez825

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Pembroke Pines, FL

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Thanks guys I would have felt uncomfortable leaning out. I have always had the tuning just right a few clicks from default on OS motors.Richard
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