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Saito 125 engine bearing failure - 3/21/2008 4:01:39 AM   
mofosheee


 

Posts: 117
Joined: 9/26/2005
From: napa, CA, USA
Status: offline 		Hi All:

Runnng a new Saito 125 with a 16X6 APC prop. Experienced two consecutive engine bearing failures after going thru 1 gallon of 20/20 power master. Running on the rich side and applying generous amounts of after run oil after the flying day.............any thoughts. Thank you.
       Post #: 1

RE: Saito 125 engine bearing failure - 3/21/2008 4:12:52 AM   
Flyboy Dave



Posts: 13358
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: online 		.....if you use a fuel with castor oil you will not have bearing failures.

FBD.

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       Post #: 2

RE: Saito 125 engine bearing failure - 3/21/2008 4:18:42 AM   
w8ye



Posts: 17275
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		Do you balance your props

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RE: Saito 125 engine bearing failure - 3/21/2008 11:19:04 AM   
liquid_TR



Posts: 454
Joined: 4/8/2007
From: ISTANBUL, TURKEY
Status: offline 		Dave, his problem seems to be mechanical, not related to rust.

Ive also suffered a SKF 6903 bearing failure on my saito 100, as it had just 10 tanks of flight on it. (I use castor oil in my fuel). One of the balls disintegrated on the last start of the day. Fortunately I immediately shut it down to prevent further damage. The bearing was a little loose to my liking before installation. Now Ive got a nice NSK 6903 with nearly zero radial play and things are fine again..

m ofoshee; choose a bearing with a minimal radial play and balance your props at the tip and at the hub. Using 3 to 5 % castor oil in the fuel will help protect your rear bearing against rim and cage rust, and you wont need to put any mineral based after run oil at the end of the day; if you run your 125 at least once every 2 weeks.

< Message edited by liquid_TR -- 3/21/2008 11:28:02 AM >

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RE: Saito 125 engine bearing failure - 3/21/2008 4:02:26 PM   
mofosheee


 

Posts: 117
Joined: 9/26/2005
From: napa, CA, USA
Status: offline 		Thanks Guys............

The props were balanced

I'll try the 3-5% castor oil.

NSK bearings!

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       Post #: 5

RE: Saito 125 engine bearing failure - 3/21/2008 5:49:06 PM   
Ed Cregger



Posts: 7618
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		That little bit of castor oil in the fuel does make a difference when it comes to ball bearing life.


Ed Cregger


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RE: Saito 125 engine bearing failure - 3/21/2008 11:10:06 PM   
mofosheee


 

Posts: 117
Joined: 9/26/2005
From: napa, CA, USA
Status: offline


Despite all the warnings from Saito & Horizon about not attempting a repair on the Saito's, I have decided to replace the bearings myself (with ceramics) rather than send the engine to Horizon and wait up to 3 weeks for a return. Repairing these engines is quite simple. Thanks all!

This forum continues to be a great resource.

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       Post #: 7

RE: Saito 125 engine bearing failure - 3/22/2008 2:44:14 AM   
XJet


 

Posts: 3327
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		Make sure you don't spend more than you need to on those ceramic bearings. Go to RC-Bearings and you'll find an excellent product at a stunningly low price.

Plus the customer-service is second to none!

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RE: Saito 125 engine bearing failure - 3/23/2008 3:25:50 AM   
mike early



Posts: 138
Joined: 10/28/2007
From: Ashland, KY, USA
Status: offline
quote:

ORIGINAL: liquid_TR

balance your props at the tip and at the hub.



What exactly does this mean?


I have 3 gallons of Wildcat 20/20 and do not want to let it go to waste, so is it a good idea to add an extra 2% of Castor? Where does one buy Castor alone?


Thanks!

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       Post #: 9

RE: Saito 125 engine bearing failure - 3/23/2008 3:27:39 AM   
mike early



Posts: 138
Joined: 10/28/2007
From: Ashland, KY, USA
Status: offline 		How does one know a bearing has gone bad

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RE: Saito 125 engine bearing failure - 3/23/2008 3:28:18 AM   
Flyboy Dave



Posts: 13358
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: online 		....buy castor at the motorcycle shop.

FBD.

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An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
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RE: Saito 125 engine bearing failure - 3/23/2008 5:50:32 AM   
XJet


 

Posts: 3327
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline
quote:

ORIGINAL: Flyboy Dave

....buy castor at the motorcycle shop.

FBD.


But be careful, some castor (usually sold for bikes or karts) is designed solely for mixing with gasoline and won't mix with methanol very well at all.


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RE: Saito 125 engine bearing failure - 3/23/2008 5:57:07 AM   
Flyboy Dave



Posts: 13358
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: online 		....there is only one type of castor oil available on Planet Earth....

....this oil will mix with gasoline (petrol) or methanol....just fine.

FBD.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

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       Post #: 13

RE: Saito 125 engine bearing failure - 3/23/2008 8:28:00 AM   
liquid_TR



Posts: 454
Joined: 4/8/2007
From: ISTANBUL, TURKEY
Status: offline 		castor (correct me if Im wrong) have a hard time mixing with very high concentrations of Nitromethane - which the fuel mfgs use chemical suspensers in the mix to hold them nice and mixed.

Balancing the prop at the hub means, after balancing the prop at the tips, you can put the prop to a 13:00 - 19:00 position on a sensitive balancer such as dubro balancer, and watch which way it sways. accordingly, add some weight to the light side of the hub (center). This usually goes for only wood props.

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RE: Saito 125 engine bearing failure - 3/23/2008 9:18:47 AM   
mike early



Posts: 138
Joined: 10/28/2007
From: Ashland, KY, USA
Status: offline
quote:

ORIGINAL: Flyboy Dave

....buy castor at the motorcycle shop.

FBD.




Can I assume this, and stuff like it, are 100% castor?


This stuff can be found at vitamin stores:

Thanks!

Edit: I see that medicinal castor is undesirable.

< Message edited by mike early -- 3/23/2008 9:49:16 AM >

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