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Old 07-04-2020, 06:44 AM
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So I went to partially reassemble my YS 91AC/FZ and found that the crank is too big for the rear bearing. The rear bearing should be a slip fit or a very light press fit but instead it's a .00075" interference fit. Even using a frozen crankshaft and heated bearings I brinnelled the rear bearing while pressing the crank in. Yes, I did measure the new rear bearing ID and it's identical to the old bearing within .0001". The crank is just tapered too much, so time to get out the emory cloth. Good times!

If there's a used engine with an oversized crank anywhere in the world I'll end up with it! More delays.

"Saitos, the engines built to spec."
Old 07-04-2020, 07:10 AM
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It will keep you occupied during the next shutdown.
Old 07-04-2020, 07:20 AM
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If da gubment tries dat agin days gonna be a LOT of bidness ownas wavin' with one fainger round hyeah.
Old 07-04-2020, 07:36 AM
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You did that too well.
Old 07-04-2020, 07:53 AM
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Yeah, kinda scared myself when I read it.
Old 07-04-2020, 07:58 AM
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I occupied a little of my time today running an OS LA 25, I am fixing up an old LT 25 for my brothers grandsons, the OS LA 25 will fly it quite well
OS LA 25 blue
Prop =====Xoar 10 x 5
Plug=====OS # 8
Fuel=====Wildcat 10% with 18% full synthetic lube
Exhaust==stock with baffle in place
Max rpm=11.580
Max safer rpm, 11,400
Best idle rpm,==2,150 A sweeter idle I've rarely seen, air bleed screw, exactly halfway across the inlet hole.
It's very easy to start.


The LT 25 on the left is the subject, equipped by me with a nose gear. I am using the new Spektrum AR 620 antenna less receiver.



Last edited by Hobbsy; 07-04-2020 at 08:01 AM. Reason: Add picture
Old 07-04-2020, 08:03 AM
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Wow, no castor even on ABC bushed engines now? Man, you do really hate castor. I've never tried that, good luck.
Old 07-04-2020, 08:19 AM
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I don't actually hate it, it just isn't necessary, I've even ran it in a Fox 25 with a steel or mehanite piston, there again, no issues.
Old 07-04-2020, 08:42 AM
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Perhaps synthetic oils have come that far, I don't know.

I guess time will tell if a properly tuned bushed abc engine will hold up to 18% 100% synthetic long term. One thing for sure is I'd make darn sure the prop and spinner are balanced dead nuts on and I suspect there would be little to no protection against lean runs.

Come to think of it, your pretty long in the tooth, so your brother's Gson could be a responsible 40 yr old that would keep that 25LA running rich.

Last edited by Glowgeek; 07-04-2020 at 08:45 AM.
Old 07-04-2020, 09:10 AM
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Oil in general has come up leaps and bounds ahead of what it use to be. Remember the days of 3K oil changes? by then the oil NEEDED to be changed, now 10K miles and the oil still has life left to it. Of course engines are also better built with tighter tolerances and better machining. The synthetics though have really improved, have really good shear and cling qualities. Oh, and they don't make you run to the bathroom after breathing in the exhaust. Not supposed to breath it in, but it happens, then you get castor on the face and inadvertently get some in the mouth, and suddenly you expel last nights dinner in a soupy mess. Castor, the bodies great cleaning agent! LOL
Old 07-04-2020, 09:34 AM
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I've run Amzoil in my autos since the 80's. Motor oil, tranny fluid and gear lube. The primary reason for the extended oil change intervals when using 100% synthetic engine oil has been from the very beginning of its introduction that it does not absorb hydrocarbons. Hydrocarbons are suspended in synthetic oils whereas with petroleum oils the hydrocarbons are absorbed which breaks down the long molecular chains that provide lubricity.

My diesels have the Amzoil fill-for-life system, my cars get a filter change every 12500 and an oil change every 25000. We sold one of those cars last year that had 225k on it, still had great oil pressure and compression. I am a strong advocate of synth oil.

That said, I'm a strong advocate for castor as well. A little castor goes a long way when I screw up my needle settings and that still happens from time to time.
Old 07-04-2020, 09:41 AM
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Sitting here at my Aunt's house at our would have been if it weren't for Covid, "4th of July Family Reunion". There's 6 people here instead of 60+. I'm bored. Can you tell?

I brought an rc plane here to shoot down with bb guns and all we can do is watch it rain.
Old 07-04-2020, 09:48 AM
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90 here today or would have gone to the flying field. I don't like heat, or let me clarify, I don't like Midwest heat. Utah heat, dry heat, I can handle. So instead I am heading down to my shop to stay cool and try to get my Chipmunk done.
Old 07-04-2020, 10:01 AM
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Miserable here in AR this time of year too. I do a lot of evening flying in my pasture where I get shade from a stand of Pines starting around 7:00 pm. My 120ft. diameter pad isn't quite large enough to fly the fast planes here but I can fly my Sr Tele and get my 3D practice in.
Old 07-04-2020, 10:47 AM
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Mixed up batch of Roundup and sprayed the drive and a few other places that needed it, and trying to eradicate the burr plants that proliferate my property. Thats about 45 minutes out in the heat and sun, just walking and pulling the trigger. I'm drenched and probably have a slight sunburn. Done for the day. Down to my workshop to cool off.
Old 07-04-2020, 11:51 AM
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Try a little rock salt and water in the driveway it will keep them away for 2 or 3 years. I did that up against the fence of the empty house in back of me with a poison ivy problem, it worked great!
Old 07-04-2020, 12:42 PM
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Yeah, two gravel driveways can be a pain to deweed. I have a whole bucket of it to play with. Now if I can just get the mower girl to stop blowing the cut grass onto the drive, there will be far less growth!
Old 07-04-2020, 04:04 PM
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My niece earned herself two Master degrees by the time she was 26, one in business and the other in nursing. Her kid is only 10 and on his way to being genius also. It's 90 and super humid here, I'm not allowed out in that, but I go anyway and don't get too carried away or do strenuous things.
The 4mm and 5mm dies came today so I can finish up another rear facing vent similar to Gary's..


Last edited by Hobbsy; 07-04-2020 at 04:21 PM. Reason: Add picture.
Old 07-04-2020, 05:22 PM
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Originally Posted by Hobbsy
Sorry Jim, I didn't intend for that to exactly be a sales pitch, although I would part with, maybe one each of the 50 and 56.
Dave, you are a good person, so I knew what you were thinking, you know the 56 is nice engine !!

Jim
Old 07-04-2020, 05:46 PM
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[/QUOTE]the new Spektrum AR 620 antenna less receiver.
[QUOTE]

now if that an't the thing to have !!

Jim
Old 07-04-2020, 07:55 PM
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It only got up to 92 today a lot cooler than Friday. was. Stupid question for you Saito geniuses, I have a .80 with a chock on it is there any advantage to keeping it or should I swap it for a velocity stack?
Old 07-05-2020, 02:22 AM
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I favor the velocity stacks and lose the chokes as soon as I get an engine, but that's me. You can also have the choke and a factory 50 sized velocity stack also.
Old 07-05-2020, 03:45 AM
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Originally Posted by FlyerInOKC
..................I have a .80 with a chock on it is there any advantage to keeping it or should I swap it for a velocity stack?
The choke is useless when using muffler pressure. For the first start of the day I place a finger over the muffler outlet, roll the engine over 4 to 6 times and the engine is typically primed and wet enough to start.

Velocity stacks are always a welcome addition to my saitos. They catch carb spitback fuel which is then recycled back into the engine on the next intake stroke. Keeps the plane much cleaner and helps tremendously with fuel economy, especially from idle to 75% throttle.

Old 07-05-2020, 07:47 AM
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Jim I sent you a pm thanks

the new Spektrum AR 620 antenna less receiver.

now if that an't the thing to have !!

Jim
Old 07-05-2020, 08:09 AM
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hmm never needed to choke any of the glow engines, or 4 stroke gas. Probably because I use the electric starter. The 2 stroke gas though, always have to choke them.


I have a .80 with a chock on it i
Are you expecting it to roll away?

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