Welcome to Club SAITO !
02-29-2020, 03:28 PM
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.
02-29-2020, 04:21 PM
02-29-2020, 06:41 PM
My Feedback: (1)
03-01-2020, 07:57 AM
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.
03-01-2020, 12:01 PM
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. 🤔
03-02-2020, 08:51 PM
There’s 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.
It’ll be interesting to see how this compares to the fa-72 when I get it all done. I’m guessing near equivalent power.
03-03-2020, 03:26 AM
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.
BTW, a tight fitting popsickle stick works great for cleaning piston ring grooves.
03-03-2020, 04:53 AM
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.
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.
03-03-2020, 06:45 AM
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.
03-03-2020, 11:14 AM
03-03-2020, 11:28 AM
My Feedback: (102)
Join Date: Dec 2001
Location: Colonial Beach, VA
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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.
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.
03-03-2020, 12:04 PM
03-03-2020, 12:31 PM
My Feedback: (1)
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.
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.
Jim
03-03-2020, 04:03 PM
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.
03-03-2020, 04:27 PM
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.