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HelicopterHIROBOOther › vote: for freya 90 os91c-spec or ys 91 st
10-21-2004 03:58 AM  13 years agoPost 1
lijin

rrNovice

manchester, UK

My Posts: All  Forum  Topic

recently, the friends around me all began to fly freya 90. to my surprise, most of them use ys 91. when i asked them why, the answer i got was that they heard that ys is better and os would be unstable. anyone got experience with these two engines? share your info with us.

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10-21-2004 10:51 AM  13 years agoPost 2
I3DM

rrProfessor

Israel

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Both engines are not perfect, i have yet to see the perfect 91 seize engine. among the 2, im an OS fan myself, i really like my PS !

www.liorzahavi.com

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10-21-2004 11:53 AM  13 years agoPost 3
Dr Lodge

rrElite Veteran

Guildford, Surrey -​UK

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I've got an OS91 PS in my Freya, works great.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-21-2004 01:53 PM  13 years agoPost 4
marc8090

rrElite Veteran

Long Island, N.Y.

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I wouldn't trade my YS in for anything. The only OS 91 that I ran though was the original one. But I've had the YS 61, 80, and 91 and they're all great.

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10-21-2004 02:27 PM  13 years agoPost 5
pilotError

rrKey Veteran

Long Island, NY

My Posts: All  Forum  Topic

OS 91

Get the YS 91. I have an OS 91 C-Spec in a Freya. After months of dicking with it, I finally got it to run well.

YS91 is set and forget.

Mike...

Good Judgement comes from Experience. Great Judgement comes from Bad Experience.

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10-21-2004 10:16 PM  13 years agoPost 6
mrNoodles

rrProfessor

Borlänge, Sweden

My Posts: All  Forum  Topic

YS91

Havent seen or heard a YS with lean midrange problems.
Set and forget engine as someone said

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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10-21-2004 10:32 PM  13 years agoPost 7
BPFlyer

rrApprentice

Wichita, KS

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I watched as two of my flying buddies tried out the 90 size motors.

One has a OS 90 C-Spec and Curtis Pipe in his Raptor 90. The other has a YS 91 with a Todd Bennett Hatori pipe in his Ex-Spec.

After many attempts at getting the OS engine to run and hold a tune, it now quietly sits on the shelf in my buddies garage. The YS buddie set his flew the crap out of it and never had to touch the needles after breaking in the engine.

Guess which one I ordered for my new big block heli? Well dah, the YS 91 with the Todd Bennett Hatori. I'm loving every minute of it. Sometimes it pays to watch as others try new stuff!!!!

Fly it like you stole it!

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10-22-2004 01:36 AM  13 years agoPost 8
franz

rrApprentice

KINGSTON JAMAICA​W.I.

My Posts: All  Forum  Topic

ys 91 is the real deal. all the os 91 engines in my part of the world have all failed due to unreliable midrange and sudden flame outs.

the ys on the other hand is a real jewel .we have hot days most of the time,89-97 deg f and on 30% coolpower we are having pure fun with the ys91. set and forget is a reality with the ys 91.

anyone has any info on the ys 50?

best regards
franz

FRANO

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10-22-2004 01:57 AM  13 years agoPost 9
4cyclic

rrKey Veteran

Montreal, Can. and​northern Vermont

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I fly 2 Os, one is a PS and the other is a cline with Viperhead, both on MP2. They run great !
my friend Nick runs the Ys with Hatori sb16 in his x-specs and also has no problems.

I feel it's great to have a choice between 2 good motors.

J.L.

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10-22-2004 02:22 AM  13 years agoPost 10
helipro357

rrNovice

Henderson, NC

My Posts: All  Forum  Topic

lijin,

I have an OS 91 C-SPEC. I agree with one of the earlier posts....you have to really break-in those engines before they run consistantly. However, I love the engine though. I think that you would really enjoy a C-SPEC

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10-22-2004 04:25 AM  13 years agoPost 11
vetrider

rrElite Veteran

Daleville, AL​(Ft.Rucker)

My Posts: All  Forum  Topic

Switch from OS pumped and nonpumped to the YS91.
On the 3rd gallon and haven't touched a needle since the 2nd tank of fuel. I won't be going back to the bis OS till they get the carbs stabilized.

Nolan

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10-23-2004 05:13 AM  13 years agoPost 12
helipro357

rrNovice

Henderson, NC

My Posts: All  Forum  Topic

os 91

Noland,

Sounds like the ys 91 is a winner. I do not know much about them. I have heard that they have as much power as the os 91 c-spec. Since you have used both engines, which is more powerful?

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10-27-2004 02:26 AM  13 years agoPost 13
Dakine

rrElite Veteran

OC, Commifornia

My Posts: All  Forum  Topic

What needle settings are you guys setting your YS 91's?

Mine only has 4 tanks and I'm having problems starting it.

Everytime I try to start it, it goes into vapor lock. Fuel pours out the muffler.

My Sullivan with 14 cells can't even crank the engine.

What is the suggested settings for idle, medium and high for a new engine? I always hear about running them rich when new, but it seems mine is so rich that I can't even start the engine.

I'm guessing it's because of my idle needle being too rich?

Is 14 cell starter enough to crank the 91?

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10-27-2004 08:07 AM  13 years agoPost 14
Henrik Engert

rrKey Veteran

Cedar Park, TX

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Hi

Dakine,
What is the suggested settings for idle, medium and high for a new engine?
The suggested needle settings are written in the manual you got with the YS engine.

I have not started my YS91 engine yet, but I will follow those needle settings that are written in the manual.

-Hinke

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10-27-2004 08:44 AM  13 years agoPost 15
mrNoodles

rrProfessor

Borlänge, Sweden

My Posts: All  Forum  Topic

From the manual:

Starting settings (break in)
Hover: 1.75
Low: 1.25
Full. 1.25

Once its broken in(my settings)
Hover: 1.25-1.50
Low: 0.6
Full: 0.75 (maybe slightly less)

Thats on 20% nitro and 15% oil.

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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10-27-2004 09:36 AM  13 years agoPost 16
Raptor Rulezzz

rrKey Veteran

Rockanje,​Zuid-Holland - The​Netherlands

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Just breaking-in a new OS91 C-spec PS, but it idles PERFECTLY... runs nice and rich (cool) and starts on first attempt, even the first time ever.

I took it apart before mounting it and I must say it`s the best fit/quality engine that I`ve ever took apart... very nice

I`ve always been an OS fan... been running a 50 for 20+ gallons on the original bearings running 17k... or higher (accidentally ran 18700 for a few flights because I didn`t have a tach and liked the way it reacted )

I must ad that I`m running 10% nitro and 20% klotz synthetic, I`ve seen people with other fuel mixes have worse luck than me

Cheers,

Rich



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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10-27-2004 10:19 AM  13 years agoPost 17
mrNoodles

rrProfessor

Borlänge, Sweden

My Posts: All  Forum  Topic

Funny thing is that some of the OS guys seems impressed that a new or soon broken in engine runs well - I think thats the least we can demand from a new engine

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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10-27-2004 11:01 AM  13 years agoPost 18
Raptor Rulezzz

rrKey Veteran

Rockanje,​Zuid-Holland - The​Netherlands

My Posts: All  Forum  Topic

Funny thing is that some of the OS guys seems impressed that a new or soon broken in engine runs well - I think thats the least we can demand from a new engine
I`ll let you know how it goes when it`s fully broken in

Also, check the setup of most of the competitors of the 3D masters
http://www.3dmasters.org.uk/3DM2004results.htm

Masters:

8x OS91 vs . 2x YS vs. 1 Webra

Cheers,

Rich



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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HelicopterHIROBOOther › vote: for freya 90 os91c-spec or ys 91 st
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