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HelicopterEngines Plugs Mufflers Fuel › YS 91 rusting quick any suggestions?
06-07-2004 01:19 AM  13 years agoPost 1
Raptormash

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Foster RI

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This is the second ys 91 in two months that has rusted very quickly. The new one only lasted two weeks. It's not even broken in yet. I always run them completely dry. I have two of the same helis and the other one has the st80 in it and it is much much older with no bearing problems. I have also owned a st60 too with no rusting problems either. Are they using cheap materials now or what. Just wondering what the alternatives are and how I can get them. What is a safe ys afterrun oil and do they make ceramic bearings for these. Thanks for anyone's help. Josh

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06-07-2004 01:34 AM  13 years agoPost 2
Hotwings

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Florida, West Palm Beach.

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What fuel are you using, my ys 80 , 63, 91 have no problem using cool power 30%. c-ya Ron

Please cancel my clearance, I have the field in sight. Got my RW Turbine Waiver, need lottery!

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06-07-2004 02:58 AM  13 years agoPost 3
Raptormash

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Foster RI

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coolpower30

I have always used coolpower 30%

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06-07-2004 05:11 AM  13 years agoPost 4
TMoore

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Cookeville, TN

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Try using an OS rear bearing. Those usually have a plastic retainer and at least the retainer won't rust.

You may try some straight Klotz synthetic as an after run oil.

Terry

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06-07-2004 12:08 PM  13 years agoPost 5
excellone

rrApprentice

Arlington, Virginia

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Run the fuel out. Close the carb and seal the exhaust port. I inject 1-2 cc of hobbico or ultra oil thru the pressure port. However, you will need to remove the plug to blow out the oil before use.

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06-07-2004 12:21 PM  13 years agoPost 6
z11355

rrMaster

New England

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try using a small amount of castor based fuel
as an after-run fuel.

get a quart bottle, mix up a ratio of around 1%
which is 1/4 ounce castor oil per quart of fuel.
fill the header tank (2oz) at the end of the day
and run the header tank till empty.

The synthetic 'Ultra Oil' the other person
spoke of is available only from YS in Nevada.

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06-07-2004 12:38 PM  13 years agoPost 7
Doug

rrElite Veteran

Port Saint Luice Florida....

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z11355

Couldn't have said it better

First member of Member of Bearings Anonymous

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06-07-2004 12:42 PM  13 years agoPost 8
bazler

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Swindon, UK

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Sounds familiar!

I took my YS91 out and left it on the shelf in my spare room for 10 days. When I came to re fit it it wouldn't turn! The rear bearing had rusted solid. The engine was run out of fuel (Wildcat 15%) and spun over dry before removal but I suspect this wasn't enough.

On a 2 month old engine costing mega bucks this was a bit demoralizing!

Baz.

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06-07-2004 12:43 PM  13 years agoPost 9
bazler

rrApprentice

Swindon, UK

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Oh yeah - I've also a OS61wc and an Irvine 39. All are treated the same yet these 2 are as new! Must be a YS thing.......

Baz.

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06-08-2004 03:27 PM  13 years agoPost 10
SteveO'

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St. Louis, MO

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Z

1% doesn't sound like much, do you think that's enough? I'm thinking about bumping that up to 2-3%.

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06-10-2004 03:53 AM  13 years agoPost 11
CSkyhawk72

rrNovice

San Francisco, CA

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hmmm...

This is strange. I've never used after run or Klotz, never had any rust develop on my little .32 Could a higher oil/less nitro content result in better protection after shutdown? .. just a question..

If it aint Boeing, I'm not going.... ScareBus, the plastic airplane.

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06-10-2004 06:14 PM  13 years agoPost 12
Agilefalcon

rrKey Veteran

Fort Worth, Texas

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On several occasions I've had my engines rust completely up. It's happened to several other people at the field too, all with different engines.

I have observed this behavior with every manufacturer of fuel, at 15% and 30% nitro content.

I believe it has something to do with how the engine was running before being shut down; i.e., lean or rich, hot or cold.

Regardless, what I have found along with other club members is this (for YS, OS, and Webra): Using Marvel Mystery Oil has meant absolutely spotless engines internally.

I bought myself a little oil can from Harbor Freight for $5 and filled it with MMO. A short piece of silicon fuel line is attached to the can along with a U shaped piece of aluminum tubing; this so as to hook it into the carburettor (OS and Webra) to squirt in oil. I then remove the plug, and turn the engine over with the starter while squirting in 3 shots of oil (use paper towel to keep from spraying everything from the plug hole).

My engines are now absolutely in great condition. Other users are injecting MMO into their YS engines via the pressure hole in the back of the engine (crankcase cover) with the same results.

Chris.

Chris Berardi
Team BobbyJack's Hobbies

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06-10-2004 06:29 PM  13 years agoPost 13
AzHyper

rrKey Veteran

Peoria, Az.

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I agree - I mix 50/50 Marvel Mystery Oil and B&M synthetic Trick Shift transmission fluid. I inject a few cc's into the YS pressure port in the back plate and then spin the engine over and replace the check valve. So far no bearing issues which is quite a change from what I was seeing prior to this procedure. I always run the fuel out of the engine before doing this.

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HelicopterEngines Plugs Mufflers Fuel › YS 91 rusting quick any suggestions?
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