RE: Saito 125 engine bearing failure

RE: Saito 125 engine bearing failure
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: Saito 125 engine bearing failure

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RE: Saito 125 engine bearing failure - 3/24/2008 2:16:37 AM

mofosheee

Posts: 102
Joined: 9/26/2005
From: napa, CA, USA
Status: offline

Thanks Bruce:

How long and how hard did you run the ceramics before the crash?

I think it is reasonable to expect that the bearings would not survive such an event. I have also replace a few cranks, but not that often. I usually go thru bearings before crankshafts. Come with the territory. Thank you for your input.

(in reply to aa2dd)

Post #: 26

RE: Saito 125 engine bearing failure - 3/24/2008 3:34:16 AM

aa2dd

Posts: 335
Joined: 5/25/2004
From: Frostproof, FL, USA
Status: offline

don't really recall how long i ran them, however, it was not long. I cannot say anything about life expectancy as they were not run all that long. they were in a saito 100, and an US 60. The ultra stick is just a fond memory now!

The Saito 100 they were in has a long history of problems. Mostly bearings. at the moment, it is down waiting for a new cam, lifters, ring and new bearings again. Last time i checked Horizon, some of the parts were on B.O., so engine is setting on shelf ... waiting. I have about reached the point of trashing it. Something has to be wrong for the bearings to keep going out. Perhaps some where along the line, I somehow managed to warp the crankcase?

Bruce

(in reply to mofosheee)

Post #: 27

RE: Saito 125 engine bearing failure - 3/24/2008 3:36:36 AM

aa2dd

Posts: 335
Joined: 5/25/2004
From: Frostproof, FL, USA
Status: offline

ohh forgot to mention how hard they were run. Not hard. I rarely fly at full throttle, except when climbing out. I like to putz around low on the deck, and fly slow.

Bruce

(in reply to mofosheee)

Post #: 28

RE: Saito 125 engine bearing failure - 3/24/2008 4:52:46 AM

XJet

Posts: 3215
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: online

quote:

ORIGINAL: aa2dd
Ceramic bearings are okay I guess, but if you dink the engine, chances are good that the bearings will be damaged. I replaced bearings in my Saito 100 with ceramic, and it ran just fine till I had a mishap with the ground! It was not a hard crash and did not do any damage to the plane to speak of, BUT, it trashed the bearings. the ceramic balls chipped, busted or what ever you wnat to call it. I figgered that i spent approx 90 bux for nothing but trouble.

Obviously you didn't buy your bearings from RC-Bearings.com. Pauls prices are (from memory) much more reasonable than that.

Personally I don't bother with ceramics for sport engines -- just plain old bearing-steel ones work fine and I haven't had to replace a set of Pauls yet, they seem to last much better than the factory originals.

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(in reply to aa2dd)

Post #: 29

RE: Saito 125 engine bearing failure - 4/20/2008 3:21:18 PM

mofosheee

Posts: 102
Joined: 9/26/2005
From: napa, CA, USA
Status: offline

Thanks all............the bearing replacement and rebuild went excellent. And the Airplane runs great. From this experience I learned upgrade to ceramics and use fuel with castor.

(in reply to XJet)

Post #: 30

RE: Saito 125 engine bearing failure - 4/20/2008 8:04:57 PM

JustErik

Posts: 546
Joined: 7/19/2006
From: Charlottesville, VA, USA
Status: offline

quote:

ORIGINAL: skrez

Hi,
How does one know when a bearing has one bad?
Frank

Since no one really addressed this question, I'll throw out my opinion. Last Fall, I was told by a flying buddy that the bearings in my Saito 100 sounded bad. I didn't know there was anything wrong. The engine started easily, had gobs of power and was as reliable as I anyone could want. After changing the bearings, however, I could hear a huge difference. Below 3,000 or 4,000 RPM, the predominant sound I now hear is the swishing of the big 16x4W APC prop and the sound of the valve train doing it's thing. It's a remarkable difference.

Before the new bearings, there was a pronounced rattling sound that got progressively worse as the throttle was advanced. It's hard to describe, but I'll know it again when and if I come across it again. The need for new bearings was also demonstrated by showing me the end play in the crank. Grabbing the tip of the prop and pulling/pushing it backwards and forwards yielded a lot of play and distinctive clicking noises as the crank moved around. With a little guidance (from an online buddy on another site), I was easily able to install new bearings from Paul at RC Bearings and now the engine is 100%. I'm almost looking forward to the next time I have to do repair work.

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(in reply to skrez)

Post #: 31

RE: Saito 125 engine bearing failure - 4/20/2008 9:48:50 PM

blw

Posts: 4454
Joined: 3/15/2004
From: Auburn, AL, USA
Status: offline

It is fun to work on engines. Sometimes, the bearings will squeal and whine loud.

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(in reply to JustErik)

Post #: 32

RE: Saito 125 engine bearing failure - 4/21/2008 1:50:47 AM

Fuelman

Posts: 1009
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline

I have bought many pair of bearings from Paul at RC Bearings. I use Pauls store exclusively now.
I like to use the stainless ones and have good service from them.

I have seen a lot of Saitos in the last few years have just as horrible of bearings as OS engines. Lets face it, these companies are buying poorly manufactured bearings, regardless of what company made them.

Castor helps the rust thing more than anything else, but a bearing that is going to fail is going to fail no matter what or how much oil you use.

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Cooper Fuels LLC

(in reply to blw)

Post #: 33

RE: Saito 125 engine bearing failure - 5/3/2008 9:02:19 AM

mofosheee

Posts: 102
Joined: 9/26/2005
From: napa, CA, USA
Status: offline

The ceramic bearing replacement worked well in my Saito.

Question. So why doesn't Saito spend a little extra money and install "better bearings in their engines?

Where I live and fly, Saito is beginning to get a "bad rap"

Customer satisfaction and reputation is on the line.

Thanks all!

(in reply to Fuelman)

Post #: 34

RE: Saito 125 engine bearing failure - 5/3/2008 1:29:19 PM

Fuelman

Posts: 1009
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline

quote:

ORIGINAL: ****sheee

The ceramic bearing replacement worked well in my Saito.

Question. So why doesn't Saito spend a little extra money and install "better bearings in their engines?

Where I live and fly, Saito is beginning to get a "bad rap"

Customer satisfaction and reputation is on the line.

Thanks all!

I see far less Saito bearing failures than I do OS 4-stroke bearing failures. As for 4-strokes, I believe Saito has a lot more 4-stroke engines in the field than OS.
With Saito, the culprit seems to be some rust gathering on the bearings causing premature failure. With the OS, I see a lot of short term catastrophic failures, mostly with the ball cages coming apart.

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Fuelman
Cooper Fuels LLC

(in reply to mofosheee)

Post #: 35

RE: Saito 125 engine bearing failure - 5/3/2008 2:12:34 PM

Hobbsy

Posts: 10426
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline

Brian, I think people hear the cam followers rattle in the Saitos and panic thinking it is the bearings, I put a new jug on my 1991 1.50, I broke it tightening the carb too tight, but I left the stock bearings in, they are fine. They are still fine in my 1992 .80.

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(in reply to Fuelman)

Post #: 36

RE: Saito 125 engine bearing failure - 5/4/2008 2:25:13 PM

Fuelman

Posts: 1009
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline

quote:

ORIGINAL: Hobbsy

Brian, I think people hear the cam followers rattle in the Saitos and panic thinking it is the bearings, I put a new jug on my 1991 1.50, I broke it tightening the carb too tight, but I left the stock bearings in, they are fine. They are still fine in my 1992 .80.

You're probably correct in that Dave. Saito's do have a bit more mechanical clatter than the OS/ clones do. Novice modelers tend to be alarmed at this but they can be rest assured it is fine as long as yourvalve lash is ste within specs. To the veteran, it is a much different clatter than the whirrr or growl of a bearing going bad.

I like to set my valves following the first gallon or so on any 4-stroke to about .0015", on saito's it quiets the valve train down a bit and on all 4-strokes it reduces the amount of lifter bounce when on the trailing ramp of the cam, and increases the "snappieness" of the low-midrange throttle response.

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Cooper Fuels LLC

(in reply to Hobbsy)

Post #: 37

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