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11-13-2005 12:01 AM  12 years agoPost 1
raptor90sepilot

rrApprentice

why do you need to know

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should i get a ys91 or os91

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11-13-2005 01:50 AM  12 years agoPost 2
jb_turner

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USA

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SEARCH

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11-13-2005 03:19 AM  12 years agoPost 3
Comanche Man

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U.S.A.

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yes

Fear my name on Xbox live

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11-13-2005 03:48 AM  12 years agoPost 4
jkelly

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Bedford, PA

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BOTH!

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11-13-2005 04:20 AM  12 years agoPost 5
raptor90sepilot

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well sorry i can't afford both also I only have one 90 sized heli(for fuel savings)

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11-13-2005 05:00 AM  12 years agoPost 6
Comanche Man

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U.S.A.

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os produces more power, ys is easier to tune

Fear my name on Xbox live

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11-13-2005 05:04 AM  12 years agoPost 7
raptor90sepilot

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ya but on that os is that the C-spect with the pump to make it pressured like the ys or is that out of the box

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11-13-2005 05:05 AM  12 years agoPost 8
ESWLFSE

rrElite Veteran

Liberty Hill, TX

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When both my 90s are in the air together they really drink the fuel.

I'm an OS and JR whore so there you go. Take your pick and you'll love it.

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11-13-2005 05:12 AM  12 years agoPost 9
raptor90sepilot

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why do you need to know

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well we're geting of the subject but i use JR TX (9303)+PCM+Futaba gear all around

Back on track, people say that the only reason the O.S.'s are stronger than Y.S.'s is the modifications (50 hyper w/big carb /90 C-spect with the ps pump)so it makes out to be more money than a Y.S.

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11-13-2005 07:37 AM  12 years agoPost 10
corey11

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Bay Area, California

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YS runs awsome straight out of the box...Easy to tune, and very powerfull

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11-13-2005 12:53 PM  12 years agoPost 11
mrNoodles

rrProfessor

Borlänge, Sweden

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YS

No need to mod the carb/add a cline, runs well out of the box.

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11-13-2005 01:42 PM  12 years agoPost 12
LS1Heli

rrApprentice

Darien, Illinois

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YS is better. It runs smooth and has great power.

Raptor 90SE

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11-13-2005 07:33 PM  12 years agoPost 13
AlanR8

rrKey Veteran

Saddleworth near Manchester (UK)

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Been there done that.

Had a C-Spec PS, became an expensive paper weight!

Bought a YS earlier this year, after the initial needle twiddle to get it running rich for the run-in, I've not touched a thing.

Probably had 10 Yankee gallons through it now and its smooth and powerful.

Why do you think they're in such short supply at the moment.......

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11-13-2005 07:43 PM  12 years agoPost 14
ThomasNB

rrApprentice

Roeyse, Norway

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the YS is easyer to start than the OS as well. but the OS produces more power, and the YS runs smoother, so take your pick. For YS u need to buy from i.e cyberheli.com or maby even helikraft.com

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11-14-2005 01:25 AM  12 years agoPost 15
WHIP

rrNovice

NEW YORK

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OS 91 ps runs great right out the box, mine and many others!

SOME IS GOOD, MORE IS BETTER AND TO MUCH IS JUST ENOUGH.

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11-14-2005 06:05 AM  12 years agoPost 16
nocontrol

rrVeteran

Cape Town, South Africa

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jb_turner - he asked between YS and OS and you screem SEARCH. Hell that motor must be great, where can I buy one?

raptor90sepilot - I have the same problem as you, what to get. At this moment I am using YS only. It is everything that has already been mentioned but I would like to have more power if it is available in the same easy to tune package. If it cost more, it is not the problem, but there is not one (OS with more power) around here that tunes as easy as my YS. Spinout just got big bore carb and cline. His first reaction was good but he sounded less convincing over the weekend. I will mail this to him asking him to post here.

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11-14-2005 06:44 AM  12 years agoPost 17
jkelly

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Bedford, PA

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Well so far I prefer my OS. I'm still breaking in the YS and it does run good but it smokes alot. I'm starting to lean it out now. Power isn't really a question for either engine for me. I noticed that the YS is drinking fuel like it's top shelf. It took quite a while to get the OS broke in and now it's super smooth and powerful. I'm running a C-Spec (no pump or viperhead) with 3 needle carb and Curtis MPII on a uniflo setup with no problems at all. It's the best engine I've ever run. The YS is running good but it needs more time before I can really comment much. It's consuming fuel faster than the OS for me and it's wearing a hole in the bottom of my tank at the spacer. I'll have to put something under the tank. My advice is get the one you think looks better or most people you fly with have or which ever one you can get a hold of. I don't think the reason YS is unavailable is due to everyone buying them up like hotcakes (even though they do) but more about limited supplies. I'd say there are a lot more OS engines in circulation than the YS 2 strokes. But I know very little about a lot of things. Pick one and if you don't like it sell it and get the other. These engines go for a good price as long as you pamper it. By the way, I think the YS is really just a bored and stroked 61. If you've seen one YS, you've seen them all.

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11-14-2005 06:56 AM  12 years agoPost 18
MicroDOC

rrVeteran

Goleta, CA

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I looked into both and decided on the c-spec. It runs well stock and can be modified to out perform most anything out there. The YS is an excellent engine and not nearly as expensive. I have been really happy with my OS50 Hypers and If the c-spec is as dependable it's my choice hands down.

Experience is something you don't get until just after you need it!

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11-14-2005 07:16 AM  12 years agoPost 19
corey11

rrElite Veteran

Bay Area, California

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i dont know how long the os will fly for, but i get 9 min 30 seconds in my fury....8.45 gear ratio 1750 rpm

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11-14-2005 10:53 AM  12 years agoPost 20
jkelly

rrVeteran

Bedford, PA

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That's about what I get running that engine rpm with the OS. On the YS I didn't exactly time it but I'm getting 8 minutes or less right now on 540cc, no header.

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