RunRyder RC
 9  Topic Subscribe
WATCH
 1 page 1986 views
HelicopterEngines Plugs Mufflers Fuel › YS 91 SR bearing life
12-03-2007 12:35 AM  10 years agoPost 1
ErichF

rrElite Veteran

Sutton, NH

My Posts: All  Forum  Topic

Now that some of you have been running the new SR, how is the bearing life compared to the old style bearings in the ST?

I need to order some bearings this week, and am considering using the OS bearings instead. However, if YS finally fixed the bearing issue with the SR, I will order SR bearings.

Comments?

Erich

PM  EMAIL  GALLERY  Attn:RR  Quote
12-03-2007 01:31 AM  10 years agoPost 2
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

if YS finally fixed the bearing issue with the SR
What was the bearing issue?

Jeff

To hover is divine, the alternative is rather PLANE.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-03-2007 01:40 AM  10 years agoPost 3
ErichF

rrElite Veteran

Sutton, NH

My Posts: All  Forum  Topic

The fact they eat them after about 20 gallons.

Some say that the nylon squirrel cage in OS bearings allows them longer life over the YS rear bearings. I'm prone to believe this, since I never had to change bearings until I started flying YS engines.

Erich

PM  EMAIL  GALLERY  Attn:RR  Quote
12-03-2007 01:55 AM  10 years agoPost 4
Flau

rrApprentice

Curacao

My Posts: All  Forum  Topic

Erich,

here ys say in the picture; New bearing for longlivity
http://www.runryder.com/helicopter/t335344p2/

So (i have the st not the sr) isn´t it possible that the sr have
a other bearing dimension then the st?

Frans.

TT G4, YS 96/120 srx, Beastx, cgy750

PM  EMAIL  GALLERY  Attn:RR  Quote
12-03-2007 02:51 AM  10 years agoPost 5
ErichF

rrElite Veteran

Sutton, NH

My Posts: All  Forum  Topic

I'm sure it's the same dimensions, as the case hasn't been changed, to my knowledge.

I have emails in to Dwight, Wayne, and Cliff to confirm.

In the meantime, I just ordered a pair of OS bearings for now.

Erich

PM  EMAIL  GALLERY  Attn:RR  Quote
12-03-2007 04:00 AM  10 years agoPost 6
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

My Posts: All  Forum  Topic

Hi

The front bearing is the same on the ST and SR. Part no. - R6211
The rear bearing has a different part no.
ST - S7113
SR - S9113

I understand the 'issue' with the rear ST bearing was fixed along time ago and that the part no. remained the same, just a different bearing type.

If the part no. on the SR is different to the ST, i would guess the size has changed.

Regards
Paul

PM  EMAIL  GALLERY  Attn:RR  Quote
12-03-2007 10:10 AM  10 years agoPost 7
DS 8717

rrProfessor

Here wishing i was somewhere else

My Posts: All  Forum  Topic

The SR bearing is the same size as the ST,The difference is the SR bearing has a plastic retainer instead of the metal one like the ST.
DOUG

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

PM  EMAIL  GALLERY  Attn:RR  Quote
12-03-2007 07:20 PM  10 years agoPost 8
Krister T

rrApprentice

Sweden

My Posts: All  Forum  Topic

The problem is still there.
It doesnt have anything to do with the plastic retainer.
The problem is the koyo bearing that YS use.
I run my SR pretty hard and the standard rear bearing last for about 20 gallon.

I found this on rr http://www.runryder.com/helicopter/...earing_load.jpg

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-04-2007 06:48 PM  10 years agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

Honestly, I'm not sure 20 gallons of fuel on an engine as strong as an SR or even an OS SZ is unreasonable given the fact we are dealing with the same bearing size that was used in 60 sized engines making half the power. Gone are the days of putting 50 gallons through a set of bearings, assuming you really care about smoothness, esp in hover.

Ben Minor

PM  EMAIL  GALLERY  Attn:RR  Quote
12-04-2007 07:12 PM  10 years agoPost 10
Droid

rrElite Veteran

Deep down in the Southwest- UK

My Posts: All  Forum  Topic

I would say that 20 gallons, nearly 80 litres of fuel is bloody amazing through a set of bearings in a 90 size ship. My OS 91szh ate its first bearings in the first 4 gallons and i would never install OS bearings in an OS engine let alone a YS.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-04-2007 08:40 PM  10 years agoPost 11
Krister T

rrApprentice

Sweden

My Posts: All  Forum  Topic

Ok! After 20 gallons so was the bearing bader than worse. It ruined the piston in the engine.
I didn't notice any power loss until my last flight at the WC in Spain.
So I proberly should have changed it a couple of gallons before the power loss, even thou it still sounded smooth?
I think that the koyo bearings don't stand up as good as the NTN bearings for our 90 engines.Thats my opinion.
But if you have a helicopter/engine that have a bad dialed clutch and is vibrating then it doesn't depends on what kind of bearing you have.

/Krister

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-30-2008 04:55 PM  9 years agoPost 12
Timbers

rrApprentice

Wisconsin

My Posts: All  Forum  Topic

Bearing

My YS SR bearing was toast after about 8 gallons of fuel through about 4 months of flying. It was corroded, so I put a new one in.

I'm injecting afterrun oil down the carb barrel now, instead of through the nipple in the backplate and then spinning the engine. That should flush the bearing out better so it will last longer next time.

...Tim

You fly RC helicopters? Can I have a ride?

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2008 05:20 PM  9 years agoPost 13
hootowl

rrProfessor

Garnet Valley, Pa.

My Posts: All  Forum  Topic

I had a metal caged one go in a YS50ST after only a couple of gallons.

Wolves don't lose sleep over the opinions of sheep

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-30-2008 05:26 PM  9 years agoPost 14
Timbers

rrApprentice

Wisconsin

My Posts: All  Forum  Topic

Yah

Metal caged bearings are a bad idea. So YS is putting a metal caged bearing in their 50? You would think they would learn. I had a YS ST II about 6 years ago, and it had a metal caged bearing, same thing happened to mine after about 15 gallons the bearing cage exploded and destroyed the engine.

You fly RC helicopters? Can I have a ride?

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2008 05:29 PM  9 years agoPost 15
Droid

rrElite Veteran

Deep down in the Southwest- UK

My Posts: All  Forum  Topic

Seems to be a lot of staining on the bearing and crank for a "couple" of gallons????

Quotes may have been changed for my own amusement

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2008 05:42 PM  9 years agoPost 16
3D Heli Ireland

rrVeteran

Ireland

My Posts: All  Forum  Topic

The YS main bearings were always notoriously bad which surprised me as the engines themselves were always so good!

The ST and SR bearings are both still not as good as the OS 91 main bearings. I always replace them with OS main bearings which are much much better. I used to replace my new YS ST engine bearings with OS from new but didn't with my SR's when I got them some months back. Several gallons on each and they have now been both replaced with OS mains. Never had to replace a front bearing though.

Come on YS get a better main bearing.......

Skookum Robotics,Sav�x, Motors and Servos,Optipower,SwitchGlo,CML st

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-30-2008 10:25 PM  9 years agoPost 17
ErichF

rrElite Veteran

Sutton, NH

My Posts: All  Forum  Topic

Heh, funny you guys revive this thread today.

My OS rear bearing I put in my YS91ST just went south today. It's been about 6 cases, I think. So, I guess it lasted longer than the YS OEM bearing, but still...

A guy here suggested to squirt some WD-40 into the engine after flight. I already religiously run out the engine after a day's flying. However, I do store in a garage, which doesn't help.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2008 10:32 PM  9 years agoPost 18
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

A guy here suggested to squirt some WD-40 into the engine after flight.
I wouldn't do that, it will most likely eat up your silicone diaphragm. There is a special after run oil for YS engines.

Jeff

To hover is divine, the alternative is rather PLANE.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2008 10:36 PM  9 years agoPost 19
ErichF

rrElite Veteran

Sutton, NH

My Posts: All  Forum  Topic

I was kinda affraid of that...I was going to test some WD-40 on some fuel tubing before trying it.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2008 11:28 PM  9 years agoPost 20
Timbers

rrApprentice

Wisconsin

My Posts: All  Forum  Topic

Sure go ahead and test it. Its just a silicone diaphram, if it eats it up you can buy a new one I think they are like $5.99.

I was squirting the Starrett M1 spray lube that I use as an after run oil into the backplate nipple, but I guess that wasn't good enough to get down to the bearing, so what I am doing now is squirting it right down the carb throat, and spinning the engine until I see it spraying out the exhaust. That flushes all that residue out that causes corrosion. I've had bearings last for years now doing it that way.

...Tim

You fly RC helicopters? Can I have a ride?

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1986 views
HelicopterEngines Plugs Mufflers Fuel › YS 91 SR bearing life
 Print TOPIC  Make Suggestion 

 9  Topic Subscribe

Monday, December 11 - 7:19 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online