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HelicopterMain Discussion › where do i get a good bearing for ys 91
10-06-2005 05:27 PM  12 years agoPost 1
NHATRANGNHOMAI

rrApprentice

usa

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please help
i wonder where do i buy agood bearing for my ys 91 ( rear and front ) and what is part number of that ?
i fly extrem ys 91 mp 2 .( 8:18 ) bearing only last for me about 35 fly .
thank you for any idea

goitoibayvoi*****English isn't my first language and I try to write as well as possible but mis

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10-06-2005 05:31 PM  12 years agoPost 2
Wa11banger

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Huntsville, Al

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Go to http://www.rc-bearings.com and get the ceramics.. You can get a front and rear pair for like 26 or something.. I have a couple of sets and know of quite a few other ppl using them and all good things to say. Ordering to your door usually around 4 days in the US

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-06-2005 06:11 PM  12 years agoPost 3
JKos

rrProfessor

Redondo Beach, CA

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If your bearings are only lasting 35 flights, don't you think there is something else going on that needs to be changed?

- John

RR rules!

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10-06-2005 09:07 PM  12 years agoPost 4
Wa11banger

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Huntsville, Al

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JKOS,

That depends, where I used to live the desert, I had zero bearing issues. I do not know where NHATRANGNHOMAI lives as his data is not filled in. I was even puzzled by how many bearing problems people have. Until


I consider myself a good tuner.. I moved here to Alabama merely 2 months ago. I have had 3 sets of rear bearings in three different engines go bad. They arent blowing up, they are corroding, getting gritty, meanwhile the innerds, piston, ring and liner still look great and the liners even still have the cross hash marks in them. I believe its the humidity down here causing the rust. I run the motor dry, turn it to TDC and plug the exhaust every time I am finished flying for the day. Any one of the ppl I have talked to got extended life out of a set of ceramics. The other thing for me to consider is switching fuel, I currently run CP30%, Powermaster fuels state right on the can they have rust inhibitors mixed in, I may have to give them a try.

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-06-2005 09:37 PM  12 years agoPost 5
ShempHoward

rrKey Veteran

San Francisco, Ca -​too many beggars +​bad drivers

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You can't believe inwhat the fuel makers say about rust inhibitors and afterun oil being in their fuels. Its hogwash.

Try injecting some air tool oil (any brand) into you engine after running it dry. Circulate the oil with your starter - problem solved or run a header tank full of castor based fuel
thru the engine.

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10-06-2005 09:57 PM  12 years agoPost 6
Wa11banger

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Huntsville, Al

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Shemp thanks for the tip,

I have a friend here at the new local club who has an engine the same age as mine.. When I heard my bearing making noise of course I pulled the backplate.. Seeing all the rust on the bearings was deff the cause. He pulled his backplate shiney new inside still.. The only difference he runs Powermaster. I am willing to do anything once but so far his bearings are beautiful.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-06-2005 10:57 PM  12 years agoPost 7
crowfly

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Pleasant View, TN​U.S.A.

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Do not use any petroleum based oils as after run oil in a YS. It will deteriorate the diaphram in the regulator.

If God had meant for man to fly, he would have given him more money

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10-07-2005 12:11 AM  12 years agoPost 8
Yug

rrMaster

UK. Herts

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I got my ceramics from rc-bearings. They are great. Nice and rusty after just a few gallons ! Still trying to figure that one out. I have been using an air dryer on my fuel bottle air inlet. It either doesn't work very well, or bearings just do go rusty quite quickly.

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10-07-2005 12:12 AM  12 years agoPost 9
Wa11banger

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Huntsville, Al

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Your ceramics races are rusty already? hmmm.. I need to find a cure for this problem real soon I do not want to be tearing down and rebuilding engines all the time

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-07-2005 12:13 AM  12 years agoPost 10
Wa11banger

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Huntsville, Al

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Guy,

BTW what fuel do you use?

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-07-2005 12:22 AM  12 years agoPost 11
Yug

rrMaster

UK. Herts

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Magnum30

I'm going to have to pull the engine shortly to fit a kline and Viper head. I think the rust is only slight but can't make my mind up whether to replace the bearings or not (I have a spare set). The problem is that I can't get the fan off !!!!!!!!

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10-07-2005 12:31 AM  12 years agoPost 12
Wa11banger

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Huntsville, Al

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Hmm... I hope its just light surface rust.. But I have always said.. "while Im in here" I have CP30 and a few cases of Magnum I havent used yet. I am thinking about going Powermaster since they do advertise right on the can some form of rust inhibitor. Will let ya know shortly if its hype or not.

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-07-2005 12:34 AM  12 years agoPost 13
Yug

rrMaster

UK. Herts

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It feels smooth when turning the crank by hand.

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10-07-2005 12:53 AM  12 years agoPost 14
Wa11banger

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Huntsville, Al

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With the fan on, they will unless its totally blown out.. You have to unload the fan from it to feel them get crunchy. Mine are way bad, but felt good with the fan.. I took the fan off and could even hear them..

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-07-2005 01:10 AM  12 years agoPost 15
vols77

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Hills of Tennessee

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Rusting Bearings

I used to have problems with rusted rear bearings also, especially in the os 50. I kept my helis indoors so humidity should not be a problem but the rear bearing were still rusting after a few gallons.

What I did was follow some advise I read here on RR.
I mixed 2 oz of castor oil with a gallon of CP30% for an afterrun mix.
When I get done flying for the day, I fill the header tank up with the afterrun mix and run the fuel out.

Since I started this shutdown procedure last year, I have not had any problems with rusting bearings.

I did have 1 os50 rear bearing go bad this year but there were no signs of rust...looks like my problem is solved.


Rick

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10-07-2005 01:14 AM  12 years agoPost 16
Wa11banger

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Huntsville, Al

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Thanks for the input Vol77, It has Shemps and your vote I may do the same. I think Powermaster is a castor synth blend. although I would prefer to have them run on an all synth blend

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-07-2005 01:20 AM  12 years agoPost 17
Yug

rrMaster

UK. Herts

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vols77

when you run out, do you turn the engine over until it will not fire anymore ?

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10-07-2005 01:39 AM  12 years agoPost 18
vols77

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Hills of Tennessee

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Ok here is my shutdown procedure.

I fill the header tank with the afterrun mix and run the header tank dry.

I then fill both tanks back up with my regular CP30% fuel - this expells all exhaust gases from the tanks.

I then start the heli at idle to clear the fuel from the carb - the fuel line is still pinched from the above step.

When the carb is clear of fuel, I remove the glow starter and turn the motor over at WOT to evaporate the remaining fuel from the motor and clear the exhaust gases from the muffler.

I then empty the fuel from the tanks and draw fresh air into the tanks and muffler.

This shutdown procedure has stopped my rusting problem and makes my clunks and clunk lines last longer.

The only downside is the shutdown procedure takes time.


Rick

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10-07-2005 01:52 AM  12 years agoPost 19
Yug

rrMaster

UK. Herts

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Purging exhaust gasses from the tanks certainly saves clunk lines.
Wouldn't it be simpler just to run tanks dry, blow out exhaust gasses from tanks, squirt some caster oil into pipe that connected to header tank and turn over the engine for 10 seconds with throttle open?

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10-07-2005 02:06 AM  12 years agoPost 20
vols77

rrApprentice

Hills of Tennessee

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squirt some caster oil into pipe that connected to header tank and turn over the engine for 10 seconds with throttle open
.
I tried this and the castor oil gummed up my carb.
blow out exhaust gasses from tanks
I like using liquid to expel the exhaust gases out of the tanks - again just my preference.


Rick

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