RunRyder - YS SR vs the new OS HZ

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Engines Plugs Mufflers Fuel > YS SR vs the new OS HZ

buburub
Senior Heliman
Location: Bayside, NY

Hi Guys,
I'm in the market for a new 90 engine and I'm wondering if any one of you have had both the YS SR and the OS HZ engines? If so, I was wondering which one is more powerful, easier to tune, smoother, etc.
Thanks in Advance,
Bub

09-03-2008 08:58 PM

Inspector Fuzz
Veteran
Location: Austin, TX. Where fat chicks succeed.

I have not run the OS HZ. However, I have run all the other variants of the OS and I have owned the YS 91ST and the YS 80.
This is what it comes down to. The OS will need to be modified to run well. If it is a pumped version it will need a cline regulator fitted. I would expect it to vibrate a lot, just like the other OS's.
I currently fly an OS Cspec with cline, Oneil carb, viper head and Hatori pipe. The motor has around $700 total invested with exhaust.
IT RUNS GREAT!
I have a YS 91ST that cost $260. It has a Hatori exhaust on it. It runs great and costs a lot less. Vibrates less too.

From what I "hear" the YSSR motors have power on par with the highly modded current OS motors.
I am done with OS. Permanently. Overall YS builds a better running motor that does not require extra modifications.
A nice, smooth, reliable motor that does not shake the crap out of your model beats a finicky, high performance, high dollar vibrator any way I look at it.

My opinion, of course!

Argue for your limitations and sure enough, they're yours

09-03-2008 10:11 PM

BJames111
Elite Veteran
Location: Billings, Montana

I agree with Inspector Fuzz. YS engines always seem to work perfectly. I've yet to have a 90 size OS motor that worked how it should. They seem to make the same mistake (lean mid range) again and again.

Brian James
Fury Extreme
Raptor 90 SE/3d
Align 600 NSP
Hirobo Quark
Elevated R/C

09-04-2008 12:01 AM

HOMEPAGE

Chris Ballard
Senior Heliman
Location: panama city

buy yourself a Rossi 91.

if your gonna go.....go all out!

09-04-2008 12:15 AM

Mike Wilson
Veteran
Location: Toronto, Canada

I currently own a few SZ engines and also the new HZ engine. I bought the Align version of the HZ that was non pumped and it did not run as well as I would like. I eneded up putting the cline regulator on it just like my SZ engines and now it runs very well and is much smoother and more powerful than my SZ engines. I agree that the OS engines still need to be modified before they will run decent but I have not yet tried the new HZ with pump. I have seen them in action and they look promising but so did the SZ with pump until it hit the mass market

. The YS SR runs very smooth and has good power but I don't like the way the muffler mounts to the crank case and I also don't like the fact that I have to buy a nearly $200 muffler to get the best performance from this engine.

Both engines are viable options if you are willing to make the investment to make them perform.

....Mike

Team Avant
Flightpower
V-blades
Aerospire
Spektrum
Teambob00

09-04-2008 02:03 AM

Jim Patterson
Senior Heliman
Location: AREA 51 Roswell

Just stuck a YS Sr in a 7.75 geared synergy. I'll try to give feedback after break-in. I must say i have and still enjoy enormous power from my OMI modded OS SX-h's / hatori SB-18's. Time will tell with the YS.

Highly addicted to carbon fiber.....

09-04-2008 03:00 AM

Futura SE
Veteran
Location: Fayetteville, Arkansas

Mike,
You more than paid for the Hatori buy purchasing the OS. They ar emuch more expensive now and once you modded it, it got a LOT more expensive. I do not understand guys willingness to change everything except the ring on the things and you still buy a new one. I have had MANY OS engines and I just sold a pumped OS91SZ as it would not run right. It would burp fuel out the carb.

I put a YS SR in and the YS is tons smoother and makes more power. I have had many YS engines. I am done with OS engines. They just never run right. The little 50's are fine, but the 90's.... eh....

A YS SR (stock out of the box) and Hatori SB-19 beats any OS period. You can keep those OS's and pay more for them too. The new HZ cost $375. A YS SR cost anywhere from $310-330.

What is wrong with how a muffler mounts on a YS???? The bolts go in the crankcase instead of through it. What am I missing??? Both ways just work. What's the deal???

Norman Ross Jr.

09-04-2008 03:28 AM

Mike Wilson
Veteran
Location: Toronto, Canada

Norman,

I agree that the YS SR is a great running motor and is equally as powerful as the OS. The new HZ is just as smooth running as the YS and although, it cost more to mod the engine, I prefer the build quality of the OS over the YS (but that's just my opinion). I have had mufflers rip out of the YS crank case in a crash and ruin the threads which requires a new crank case in most instances.

The cost of owning the YS can get pretty high when you crash and have to replace that expensive Hatori SB-19.

As I said before, both are great options. Pick your poison

...Mike

Team Avant
Flightpower
V-blades
Aerospire
Spektrum
Teambob00

09-04-2008 05:04 AM

Timbers
Senior Heliman
Location: Wisconsin

If you are in the market for an engine go with the SR, its so nice, all I do is put fuel in it and fly. Every once in awhile tweak the needles.

If you have time to wait, I'd give that new OS some time for people to actually break them in and run them for awhile. I'd hate to buy OS's 6th attempt at a 90 size engine and find out its a POS like the rest of them.

...Tim

You fly RC helicopters? Can I have a ride?

09-04-2008 05:43 AM

HOMEPAGE

buburub
Senior Heliman
Location: Bayside, NY

Thanks for the reply guys! Has anyone owned both?
Bub

09-04-2008 12:10 PM

Futura SE
Veteran
Location: Fayetteville, Arkansas

I had pumped OS. Never again.

09-04-2008 05:05 PM

Mike Wilson
Veteran
Location: Toronto, Canada

Now that is something that we can both agree on

.

Team Avant
Flightpower
V-blades
Aerospire
Spektrum
Teambob00

09-04-2008 05:41 PM

wings19
Veteran
Location: Traverse City, MI

I've given up on my OS pumped SZ also... Ordered the HZ non pumped. I was talking to Botos about it at IRCHA and he loves his, says its the best one yet. We will see...

Nick
If the wings are travelling faster than the fuselage, it's probably a helicopter

09-04-2008 08:04 PM

HOMEPAGE

LONEWOLF2440
Senior Heliman
Location: MYRTLE BEACH S.C

Will never repeat never ever own another os engine again. Both my ys are flawless My last 3 os in the garbage can

TREX 700,S YS91 SR JR 8717

09-04-2008 08:16 PM

Timbers
Senior Heliman
Location: Wisconsin

I remember people telling me that the SZ-H was the best one yet. That may be, on top on the ones they made in the past! I even went as far as to have it sent to Oneils to have the OMI mods done to it, sitting with a $500 paperweight now. The YS SR is so nice.

You fly RC helicopters? Can I have a ride?

09-04-2008 08:42 PM

HOMEPAGE

louk05
Key Veteran
Location: Flying in BelAir Maryland

Well you will not get the perfect motor. here is how i see it. If you want power you go with os and if you want easy tuneing you go ys. But now that the new os motor is out.It runs smooth as crap and makes tons of power stock. Its very easy to tune once you figure it out. I had the sz and put the hz in and its night and day. The new os went above and beyond the old one. So far i have set it and forget it right now. My motor ran flawlessly once i got it worked out. I did just for the heck of it put the viperhead and cline regulator on it along with 60k portec carb to see how it ran. now its got a ton of power and is jusy plain smooth. This motor is just about the perfect motor. Its easy to tune and tons of power. I would get the new Align hp motor for 317 . and you will not be disapointed. I think its hard right now for ys owners to say as they have not yet ran this motor. But more and more you will see them at least trying it. A few guys at my field are waiting on there new os now and are current ys lovers so we will see very soon. This question is still a bit to early. But i would say go O.S all the way. The new one is unreal how smooth and much power it makes. I dont think the sr is close in power to the sz just smoother. now O.S has both even more power and just as smooth and easy to tune.

Fly Hard,Crash Hard,Upgrade, Align,AMA#906056

09-05-2008 03:28 AM

TMoore
rrProfessor
Location: Cookeville, TN

You're wasting your time on the keyboard trying to covert YS owners from the darkside, they think their engines are bulltproof and ultimately better. The only way they listen is at the field. The field is where you will win them.

BTW, I would be the first to admit the SZ was crap, that's why I never wasted my money on one but I have a number of C-Specs that folks couldn't make run that are as smooth as any HZ and I have a fraction of the money invested in them because of the way their previous owners gave up on them. They run great too with the VH, modded piston and Cline BB carbs.

TM

Buying tools is half of the equation, knowing how to use them is the other. - T Moore

09-05-2008 04:13 AM

HOMEPAGE

Chris Ballard
Senior Heliman
Location: panama city

if you can tune a motor skip the os or ys and buy an Itilian motor. I don`t know why people just don`t want to look at these motors. I have one and would buy one again over any os or ys. In my opinion over the years Itilians make the best 2 stroke motors on the planet. No matter what kind of fuel they run on. They dominate on any class that runs 2-stroke motors besides r/c helicopters because they take a little skill to get running and everybody wants EASY!!!!!!!!!!

if your gonna go.....go all out!

09-05-2008 04:29 AM

louk05
Key Veteran
Location: Flying in BelAir Maryland

well

Probably because the pros are not flying them.lol not good enough for the pros not good enough for us. And o.s and ys any one can tune and fly and every one flies them so why try something new when what you have works. I would try a ys but why when my hz flies so darn good and so smooth. and now that i put all the mods on that it did not need in the 1st place. Honestly the new hz is one sweet motor. Its light, it gas loads of power all through rpm and above, And its easy to tune, Iam running mine rich right now since i put the upgrades on and it still has loads of power. not that i need all that i just know its there and can really help me in a pintch. Any ways, yeah i know you cant get a ys owner over to the dark side. Most have only flown 1 or 2 o.s motors and yeats ago and dont think anything has changed. Yes the sr is a great motor. but now o.s has one that can no doubt exceed the sr in every way. Time will tell though Its still a new motor and we will se how long it holds up. So get the new HZ and you will be very happy you did. Or even to save a few bucks get the AlignHP its the same motor to the t just crank case is branded align and not o.s. Good luck and what heli is it going in. if its a lighter heli than the o.s or ys is great. but if its a heavier motor O.S for sure. Thats where the power comes in. well it comes in in a lighter one as well but really noticable in heavy helis.

O.S HZ ALL THE WAY

Fly Hard,Crash Hard,Upgrade, Align,AMA#906056

09-05-2008 05:46 AM

dogg5306
Senior Heliman
Location: Brussels, Belgium

Dead simple... which engine is being run by 2007 3D Masters champion, which one is run by 2008 3D Masters champion... YAMADA

And please don't tell me that the HZ wasn't available yet for Lukas Riva who's a sponsored Align pilot as Bobby Watts has used it during the event...

Dead simple... YS Powaaaaaaaa rules...

MA Stratus
Avant Aurora
Hirobo Turbulence D3

09-05-2008 10:40 PM

HOMEPAGE

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Engines Plugs Mufflers Fuel > YS SR vs the new OS HZ

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