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Old 01-19-2019, 05:25 AM
  #38626  
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Anyone worn out a Saito piston ring?

I've torn down my preowned 82 a half a dozen times to trouble shoot and replace/clean various parts. Looks like everything is a go now except maybe the ring. Each time I reassembled it with the ring gap in the exact same position to minimize break in wear. The first 4 times I torn it down the ring gap position was in the exact same spot after running. These last two times it wasn't, it had rotated 45°, then 90° and peak rpm is down from 9700 to 9350. Idle is now unstable at 1900 where previously it was rock solid. I checked the intake tract for leaks, tried a new F plug and the valves are seating perfect so maybe the ring has had to re seat too many times?

Some of you here seem to have run endurance tests on Saitos, really put them through the wringer. What say you?
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Old 01-19-2019, 05:30 AM
  #38627  
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It doesn't matter where the ring gap is, it works the same everywhere and since it's not pinned it won't stay put.
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Old 01-19-2019, 05:42 AM
  #38628  
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I got to look inside the smelly two stroke K&B 45, the cylinder hold down bolts had red Loc-Tite on the full length of the threads. I was lucky to get them out without twisting them off. The cylinder has plenty of pinch, the crank bushing is slop free. The bolts are all 6-40 and not the typical 6-32.The head gasket is an O-ring, that's new to me too. New bolts and gaskets coming.

Last edited by Hobbsy; 01-19-2019 at 08:14 AM. Reason: Correction
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Old 01-19-2019, 06:51 AM
  #38629  
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Originally Posted by Hobbsy View Post
The Manual: Attachment 2263264

Lists at $1,699.99 here.
Width==285.3 mm or 11.232283"
Hey all
A local to me guy has a Saito 3.25 five cylinder radial like mine. Trying to work out a way to add it to my collection. He mentioned to me that Saito had dropped that engine and it is unavailable new.
Anybody have a back story on that claim?
This on is the dual plug per head, I believe that is later than my single plug motor.
Whaadayano bout that historians?
Peess
We get a little hinky about people pulling in when my garage door is open. My v twins are skeptical of riff raff. And my Glocks are too😳
​​​​
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Old 01-19-2019, 08:00 AM
  #38630  
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The engine code for the 325-r is X, they no longer have the engines, just parts and only 38 of them: https://www.horizonhobby.com/SearchD...ain=&pageView=
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Old 01-19-2019, 08:04 AM
  #38631  
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https://www.horizonhobby.com/product...A-y-saie325r5d

Here is some more skinny on it. This one is engine code Y, the code chart has the numbers transposed as 235R5D, the D for dual plug.

Wow, they actually have cylinders for the Y: https://www.horizonhobby.com/cylinde...y-sai325r5d01c

Last edited by Hobbsy; 01-19-2019 at 08:17 AM. Reason: Add content
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Old 01-19-2019, 11:37 AM
  #38632  
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235R5D,,, wow, 10 glow plugs, at $12 each (OS F) $120 LOL

yes, so Horizon is now getting $12 for the OS F plug, I guess they really want us to go E flying

Jim
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Old 01-19-2019, 11:44 AM
  #38633  
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Dave; I got to look inside the smelly two stroke K&B 45
LOL
but a good smelly two stroke

Dave; The head gasket is an O-ring, that's new to me too.
I'm wondering if that is a Sportster ?

Jim
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Old 01-19-2019, 11:48 AM
  #38634  
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hey Dave, see what it says in my link, if the link works correctly, quote> "O-ring head seal (early model)"

http://www.mecoa.com/kb/59/59-parts.htm

Jim
yeeaa, Saito baby, that's the ticket !!
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Old 01-19-2019, 01:14 PM
  #38635  
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Yes sir, and believe it or not it's still springy, I ordered one anyway. Yes, it is a Sportster.
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Old 01-19-2019, 01:23 PM
  #38636  
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Speaking of springy, I received the new valve springs for the 82. The free height of the new springs is .005" LESS than the old ones. Didn't bother to install them, nothing wrong with the old ones.
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Old 01-19-2019, 01:23 PM
  #38637  
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It had never had a battery installed and the cables were gone, I made my own, it starts instantly. I had to rebuild the carb and replace the fuel line and fuel filter.
USPS tracking still says that the 120-R Keleo exhaust is still coming today, so wile waiting for that I've been rescuing a 7,500 watt Porter Cable generator. It has a 13 hp Saito engine in it.
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Old 01-19-2019, 01:36 PM
  #38638  
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Originally Posted by Glowgeek View Post
Anyone worn out a Saito piston ring?

I've torn down my preowned 82 a half a dozen times to trouble shoot and replace/clean various parts. Looks like everything is a go now except maybe the ring. Each time I reassembled it with the ring gap in the exact same position to minimize break in wear. The first 4 times I torn it down the ring gap position was in the exact same spot after running. These last two times it wasn't, it had rotated 45°, then 90° and peak rpm is down from 9700 to 9350. Idle is now unstable at 1900 where previously it was rock solid. I checked the intake tract for leaks, tried a new F plug and the valves are seating perfect so maybe the ring has had to re seat too many times?

Some of you here seem to have run endurance tests on Saitos, really put them through the wringer. What say you?

Generally on larger engines most folks tend to avoid placing the end gap in the middle of the thrust face. Many assembly manuals specify the preferred stagger at assembly.

Dave

Double check, those screws may be 5-40 . Just a wee bit smaller OD at .125"
They were quite popular back in the day.

Last edited by Jesse Open; 01-19-2019 at 01:44 PM.
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Old 01-19-2019, 01:42 PM
  #38639  
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Ok another Saito. This one is pretty darn nice, thanks Dave!!!
can’t wait to fly this one.

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Old 01-19-2019, 03:17 PM
  #38640  
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Anyone worn out a Saito piston ring?
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Old 01-19-2019, 03:23 PM
  #38641  
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Originally Posted by Glowgeek View Post
Anyone worn out a Saito piston ring?
nope not yet i still fly two 56 that are 20 years old.
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Old 01-19-2019, 03:26 PM
  #38642  
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Originally Posted by Captcrunch44 View Post


nope not yet i still fly two 56 that are 20 years old.
Thanks Capt.
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Old 01-19-2019, 04:13 PM
  #38643  
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Gary, they are 6-40 and I'm glad the instructions mention it because I almost ran a 6-32 tap into them. That might have made a real mess.

Yo Crunch, have you run that 82 yet, it should be smooth as glass.
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Old 01-19-2019, 04:19 PM
  #38644  
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Originally Posted by Hobbsy View Post
Gary, they are 6-40 and I'm glad the instructions mention it because I almost ran a 6-32 tap into them. That might have made a real mess.

Yo Crunch, have you run that 82 yet, it should be smooth as glass.
Okay, just thought I would offer a heads up. The 5-40 and 6-40 get flip flopped at times. The 5-40!are easy to spot being an even 1/8 inch.

Yep, sure is a good thing
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Old 01-19-2019, 04:23 PM
  #38645  
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Originally Posted by Jesse Open View Post


Okay, just thought I would offer a heads up. The 5-40 and 6-40 get flip flopped at times. The 5-40!are easy to spot being an even 1/8 inch.

Yep, sure is a good thing
Thanks for the heads up. I ordered a new set of bolts the Red Loc-Tite left them messed up. I have enlarged the occasional had bolt from 4-40 to 5-40 so far that has not caused any problems, but certainly cured some.
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Old 01-19-2019, 07:02 PM
  #38646  
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boy, I like the Hog, but it's a bit bigger than I want, but maybe I will buy one, but I will have to look a bit longer to see if I can find something a bit smaller, but just as sporty,

actually I am looking for 2 birds, one for my HP 61 and one for my K&B 100, I would like planes in the 68"-62" span for the 61 and something like 64"-66" for the 100,

rather ARF or a build kit, any body have an ideas ??

Jim
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Old 01-19-2019, 07:41 PM
  #38647  
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Dave nope not yet still waiting to prank my friend
it will be great i will fill you in when i do.
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Old 01-20-2019, 01:01 AM
  #38648  
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Because if they are going to make a 100cc or bigger inline twin or triple gas engine i'll buy it and it's going in this thing


And get flown like this,nice CARF mustang boys


Originally Posted by Glowgeek View Post
Speaking of springy, I received the new valve springs for the 82. The free height of the new springs is .005" LESS than the old ones. Didn't bother to install them, nothing wrong with the old ones.
Glowy when you took the barrel off your fa82 you can grab the big end of the rod and try to pull the piston out without putting a finger on the top of a valve,it takes a lot of pulling if all is good.

Now,an analogy if i may,please bear with me.Most,but not all diehard motorcycle riders will read motorcycle magazines and use the internet to read motorcycle related articles/blogs...where they discuss among other things what a motorcycle manufacturer has just patented for use on next years models,and what everybody thinks is a fair guess at size,performance and weight figures.Motorcycle manufacturers as a group suffer from the same leakers that gummints around the world do,right or wrong.
My question relating to SAITO fg engines is this...does anyone here know where you can go to get a peek at what saito are or may be producing in the near future??
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Old 01-20-2019, 05:11 AM
  #38649  
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Originally Posted by the Wasp View Post
boy, I like the Hog, but it's a bit bigger than I want, but maybe I will buy one, but I will have to look a bit longer to see if I can find something a bit smaller, but just as sporty,

actually I am looking for 2 birds, one for my HP 61 and one for my K&B 100, I would like planes in the 68"-62" span for the 61 and something like 64"-66" for the 100,

rather ARF or a build kit, any body have an ideas ??

Jim
Saito; yee doggy
Jim,

Take those Hog plans to Kinkos. They can shrink them to any size you want. I did that with a Fly Baby and it worked out well.

How about a Venture 60?
I have a new kit. A lot like the Four star 60 but sportier. Many folks do a clipped wing version and they always fly well. One of the nicest kits you will ever see too.


Last edited by Jesse Open; 01-20-2019 at 05:18 AM.
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Old 01-20-2019, 06:09 AM
  #38650  
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Originally Posted by Jesse Open View Post
Generally on larger engines most folks tend to avoid placing the end gap in the middle of the thrust face. Many assembly manuals specify the preferred stagger at assembly.
Not sure how this applies. I was primarily interested in your experiences with saito ring wear.

Originally Posted by Hobbsy View Post
It doesn't matter where the ring gap is, it works the same everywhere and since it's not pinned it won't stay put.
Not always, I've seen rings spin in full size engines and I've seen them stay exactly where I put them when I built the engine. I think it depends on the concentricity of cylinder, piston and rings as well as many other factors including but not limited to harmonic vibes. As I mentioned earlier I have seen them spin and not spin in this saito 82 as well.

As with Gary, I am interested in your experiences with saito ring wear Dave.

Originally Posted by Rudolph Hart View Post

Glowy when you took the barrel off your fa82 you can grab the big end of the rod and try to pull the piston out without putting a finger on the top of a valve,it takes a lot of pulling if all is good.
Yes Pete, it takes a lot of pulling with the valves closed, even more now that the valves aren't leaking.

Last edited by Glowgeek; 01-20-2019 at 08:01 AM.
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