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Old 02-29-2020, 03:28 PM
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Hadn't thought of drilling the clip, figured it was spring steel. I had one of the factory stacks fall off in flight and replaced it with brass tubing. I turned the tubing down to fit the existing hole in the clip and swaged it to secure.
Old 02-29-2020, 03:35 PM
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To use a 10 mm tube you need to drill it. I put them in my little vise and gently clamp them to drill.
Old 02-29-2020, 04:10 PM
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Lonnie, Horizon seems to have these in stock, I bought the last that MacGregor had.


SAI5092 at Horizon.
Old 02-29-2020, 04:21 PM
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Originally Posted by Hobbsy
Gary, I ordered another accessory for the lathe, a radius cutting tool, maybe I can make myself some brass balls.

That is one of the handiest tools you will buy!
Old 02-29-2020, 06:41 PM
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Originally Posted by Hobbsy
Gary, I ordered another accessory for the lathe, a radius cutting tool, maybe I can make myself some brass balls.
Dave, they'll look good polished, every one will want to hold them

Jim

Last edited by the Wasp; 02-29-2020 at 06:45 PM.
Old 02-29-2020, 06:54 PM
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Originally Posted by Hobbsy
Lonnie, Horizon seems to have these in stock, I bought the last that MacGregor had.


SAI5092 at Horizon.
Bingo! Thanks
Old 03-01-2020, 07:57 AM
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I always file the "clips" to size with a smooth, round file. No stress or distortion and a perfect fit .



Last edited by Jesse Open; 03-01-2020 at 08:00 AM.
Old 03-01-2020, 08:07 AM
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Looks great Gary, I like the larger shoulder on the stack to keep things from distorting when swaged. Aluminum is lighter too. Win win.
Old 03-01-2020, 12:01 PM
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I finally got the 90T apart. The bearings are a real mess. Both front and rear are seized.The LH piston was a real PITA to remove the pin. This was crucial in order to remove the connecting rods. Then I discovered it slides in/out from one direction only. 🤯 Maybe that is why there is only one retaining disc on each piston pin. 🤔



Old 03-02-2020, 06:26 PM
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There's a lot of burnt on blowby on that left piston. It was probably run with a stuck ring.
Old 03-02-2020, 08:51 PM
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Originally Posted by Glowgeek
There's a lot of burnt on blowby on that left piston. It was probably run with a stuck ring.
You may be right. Both rings were stuck however. A total clean and reassemble is in order.

Thereís hardly any carbon inside each cylinder and the valves are pretty clean as well. I know so many people say this about engines but it does look pretty low time.

The problem with these engines it seems is that they really need to be flushed out and well lubed for long term storage.

Itíll be interesting to see how this compares to the fa-72 when I get it all done. Iím guessing near equivalent power.
Old 03-03-2020, 03:26 AM
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True, these little engines benefit tremendously from a strict regimen of afterun oil and a nice shot of CorrosionX for long term storage. Almost every used 4S engine I've bought has been run while gummed up. Most had pistons that look like your 90T, flat spotted tappets and dented cams.

BTW, a tight fitting popsickle stick works great for cleaning piston ring grooves.
Old 03-03-2020, 04:53 AM
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The oddfire twins do a pi$$ poor job of case venting. Leads to a lot of trapped crap inside. Add to that, high case pressure disturbs the pressure differential that presses the ring to the cylinder wall.
Directing positive venting thru the engine , carrying oil to areas most in need of oil can vastly improve that situation in most any engine.

Limiting castor percentage to 2% or maybe 4% and good dry run down and after oiling will eliminate valve sticking and bound up rings. You still get the extreme pressure qualities that minimize valve train mechanicals. Just no sticky stuff. The directed venting also helps promote effective after run oiling.
Old 03-03-2020, 06:45 AM
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The 90T has an interesting lubrication system to say the least. First, there is a vane pump unit driven off the crank pin which I assume pumps air through the engine. Then there are 2 extra passages in the crankcase to allow oil to get the cam area. But what is strange is why restrict the nipple where the oil is suppose to discharge?




Last edited by Quikturn; 03-03-2020 at 11:33 AM.
Old 03-03-2020, 11:14 AM
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That does not appear to be factory thing, I rebuilt a 90-t a while back and it was not restricted. I found several images on line and they did not appear to be restricted either.


Old 03-03-2020, 11:28 AM
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I got a chance to run an early 65 I rebuilt a while back.

Engine, early Saito 65 with 12.7 to 1 compression
Prop======Xoar 13 x 6
Fuel======Wildcat 10% with 18% fuel synthetic lube
Plug======Well used Fox Miracle
Exhaust===Late revised, cast muffler
Idle======2,100
Max rpm==9,950


At full blatt.

At 6,000, super smooth.
Old 03-03-2020, 11:32 AM
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Pretty sure it is how they come. Mine arrived that way and have seen other twins with the same nipple.
Old 03-03-2020, 11:43 AM
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I sold that engine so can't look, I didn't mean to mislead, Thanks
Old 03-03-2020, 12:04 PM
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Originally Posted by Hobbsy
I sold that engine so can't look, I didn't mean to mislead, Thanks
No worries. ☺️

Not sure why the engineers at Saito thought that was a good idea though.
Old 03-03-2020, 12:31 PM
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Originally Posted by Hobbsy
I got a chance to run an early 65 I rebuilt a while back.

Engine, early Saito 65 with 12.7 to 1 compression
Prop======Xoar 13 x 6
Fuel======Wildcat 10% with 18% fuel synthetic lube
Plug======Well used Fox Miracle
Exhaust===Late revised, cast muffler
Idle======2,100
Max rpm==9,950
At full blatt.
At 6,000, super smooth.
Dave that's some peak RPM numbers there, knowing that a Xoar 17x6 loaded my Magnum 180 4St 300 RPM less than an APC 17x8 did>. I have to wonder what that FA65 would have spun an APC 14x6 to/at.

Jim
Old 03-03-2020, 02:49 PM
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I am pretty sure I don't have an APC 14 x 6, but I'll check, since I don't fly them I'm always hesitant to buy them.
Old 03-03-2020, 03:35 PM
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Fun in the sun today. Time to clean all the slime off after 40min of fly time.....oops, that's right, there isn't any cause it's a Saito gasser!


Old 03-03-2020, 04:03 PM
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Anyone have 1 to 3 of these? Can not find online anywhere...

Throttle Value Ext Adapter:LL (SAI90TS131)






Last edited by rowdog_14; 03-03-2020 at 04:06 PM.
Old 03-03-2020, 04:27 PM
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Search for 2-56 threaded aluminum standoff, that's what I used. Can be cut to any length you desire and simply drilling a hole near the end for your throttle cable is a snap. Connecting it to the throttle lever requires only one screw, a washer and some blue loctite.
Old 03-03-2020, 04:33 PM
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Thanks, looks like the radial adapter will work. SAI90R3131

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