Welcome to Club SAITO !
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RE: Welcome to Club SAITO !
O.F.,
If H. has run a .62 on a 13.5x6 perhaps that engine will run well with a 13x6 (13x7?).
Maybe you should put it back on the bench with the 13" prop, stock muffler with pressure to the tank, and tune it with that prop. See how it does.
Apparently, the engine became difficult when you went to the larger prop and installed it your plane. You could have a carburetor problem, but it seems that the prop and installation are more likely the origin of your troubles.
Four turns out on the HS is probably far too rich, especially if the engine is slowed by a large prop. Tune it...HS first at WOT and then LS. Adjustment of the LS is a must or the engine will not run properly.
Let us know what happens! Good luck, mate[8D] !
If H. has run a .62 on a 13.5x6 perhaps that engine will run well with a 13x6 (13x7?).
Maybe you should put it back on the bench with the 13" prop, stock muffler with pressure to the tank, and tune it with that prop. See how it does.
Apparently, the engine became difficult when you went to the larger prop and installed it your plane. You could have a carburetor problem, but it seems that the prop and installation are more likely the origin of your troubles.
Four turns out on the HS is probably far too rich, especially if the engine is slowed by a large prop. Tune it...HS first at WOT and then LS. Adjustment of the LS is a must or the engine will not run properly.
Let us know what happens! Good luck, mate[8D] !
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RE: Welcome to Club SAITO !
I just ran my 2nd .62 a few minutes ago.
Fuel===WildCat 15% with 18% all synthetic
Plug===Fox Miracle
Stock exhaust
Bolly 12.5x6==10,350 home grown for you OF
Graupner 12.5x6==9.950
APC 12x7=====9,950
The HS needle is about 1.75 turns out from bottomed out and will barely run at 3 turns out.
Fuel===WildCat 15% with 18% all synthetic
Plug===Fox Miracle
Stock exhaust
Bolly 12.5x6==10,350 home grown for you OF
Graupner 12.5x6==9.950
APC 12x7=====9,950
The HS needle is about 1.75 turns out from bottomed out and will barely run at 3 turns out.
RE: Welcome to Club SAITO !
Has any one tried a K&B four stroke plug ?? There is a hobby shop going out of buisiness and they have a ton of them , might be around 3.50 each.
Andy
Andy
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RE: Welcome to Club SAITO !
Can anyone help me locate a crankshaft and gasket set for an old Saito FA-120. This is the engine BEFORE the last 120 (also discontinued because of the 125.)
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RE: Welcome to Club SAITO !
As far as I know the crankshafts are interchangeable between the early 120 and the 120S.
You can make the gaskets yourself. The valve cover gaskets are the same as the last 120S, 150S, etc
Edit: The cranks are different in the sizes of the bearing journals and are not interchangeable
The Old 120 uses a R6 in the front which measures .325 X .875 X .287 in inches. The rear bearing is a metric 6902 (15 X 28 X 7)
The 120S uses a metric 6000 in front (10 X 26 X 8) and a metric 16003 in the rear (17 X 35 X 8)
You can make the gaskets yourself. The valve cover gaskets are the same as the last 120S, 150S, etc
Edit: The cranks are different in the sizes of the bearing journals and are not interchangeable
The Old 120 uses a R6 in the front which measures .325 X .875 X .287 in inches. The rear bearing is a metric 6902 (15 X 28 X 7)
The 120S uses a metric 6000 in front (10 X 26 X 8) and a metric 16003 in the rear (17 X 35 X 8)
RE: Welcome to Club SAITO !
Thanks for the support rimcnii and hobbsy
I hope the photo uploads ok and some one will say wow no you don't do that!
All i can say is the engine has a very broad hsn range that fluctuates with patience.
I hope the photo uploads ok and some one will say wow no you don't do that!
All i can say is the engine has a very broad hsn range that fluctuates with patience.
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RE: Welcome to Club SAITO !
I see a refueler valve, they are famous for leaking and causing exactly the problems you are having. It also appears that the bottom left mounting bolt is banging on the HS needle when the engine moves on the soft mounts.
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RE: Welcome to Club SAITO !
Wondering why a Saito 1.00 runs fine when the LSNV is turned all the way in, i.e., bottomed out? I've been trying to tune out a vibration problem (at half throttle) and discovered that even with the LS needle valve turned in all the way it accelerates without stumbling or burbling. Maybe it runs out of threads before the valve reaches "bottom"? Any suggestions?
Thanks
Bob
Thanks
Bob
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RE: Welcome to Club SAITO !
Is the HS needle at absolute peak when you set the LS needle? The two needles effect each other somewhat and since the HS needle has a fixed seat it needs to be peaked to get the LS needle correct, then the HS needle can richened down about 200 rpm without changing the LS setting.
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RE: Welcome to Club SAITO !
ORIGINAL: Hobbsy
Is the HS needle at absolute peak when you set the LS needle? The two needles effect each other somewhat and since the HS needle has a fixed seat it needs to be peaked to get the LS needle correct, then the HS needle can richened down about 200 rpm without changing the LS setting.
Is the HS needle at absolute peak when you set the LS needle? The two needles effect each other somewhat and since the HS needle has a fixed seat it needs to be peaked to get the LS needle correct, then the HS needle can richened down about 200 rpm without changing the LS setting.
Thanks,
Bob
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RE: Welcome to Club SAITO !
ORIGINAL: RC Specialties
Magna,
The 15% does fine.
Jim
Magna,
The 15% does fine.
Jim
Is 15% the min recommended nitro level? Am I compromising the optimum performance at 15%. For example the YS need at least 20% to be consider optimized.
The problem in our local hobby shop there is no 20% or 25% available. They skip it from 15 to 30%!
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RE: Welcome to Club SAITO !
Thanks for the response. When I spoke with Horizon, they told me that the counter weight on the newer crank is lighter. Would this make a difference? The Horizon people seemed to think so, but they also seemed to be in a bit of hurry to finish with me.
Apparently, the piston and con rod of the newer 120 are lighter. Can the newer piston and con rod be used in the older cylinder?
How does one go about making the complex gasket that's used under the cam cover?
Again, thank you for the help.
Apparently, the piston and con rod of the newer 120 are lighter. Can the newer piston and con rod be used in the older cylinder?
How does one go about making the complex gasket that's used under the cam cover?
Again, thank you for the help.
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RE: Welcome to Club SAITO !
As promised, here are the pictures of my AT-6 Texan with Saito FA82.
http://picasaweb.google.hr/rvt464/AT6Texan
http://picasaweb.google.hr/rvt464/AT6Texan
RE: Welcome to Club SAITO !
As sodbuster points out, Saito says 10-30%. You asked if the 15% is okay. I run 15% in all of my engines and they perform well. I have not tried the 30% but others claim a performance increase over the 15%. For everyday flying I don't see the advantage vs. additional cost.
Jim
Jim
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RE: Welcome to Club SAITO !
Magna, if you can get 5% nitro fuel, the 1.25 will run just fine on 5%, I have never bought into the old, "engines are easier to tune on 20%" myth. The only Saito that is a little touchy on the 5% fuel is the little .30 and all it needs is to idle slighly faster.
RE: Welcome to Club SAITO !
All,
I need a few ideas. My trusty Saito .72 has well over 100 hours in the air, and now is showing signs of slowing down. Where it previously would turn 10,500 on an APC 13x6 using 15% powermaster fuel and an OS F plug, it now only does 9800. I've done the obvious, including setting the valves and changing to a new plug. Compression feels good and I can't feel any roughness or play in the bearings. On the positive side, fuel consumption seems to have decreased. I've also run it without the muffler and only picked up a few hundred rpm. It doesn't feel worn out, but I am stumped on getting it back to full performance.
Bob
I need a few ideas. My trusty Saito .72 has well over 100 hours in the air, and now is showing signs of slowing down. Where it previously would turn 10,500 on an APC 13x6 using 15% powermaster fuel and an OS F plug, it now only does 9800. I've done the obvious, including setting the valves and changing to a new plug. Compression feels good and I can't feel any roughness or play in the bearings. On the positive side, fuel consumption seems to have decreased. I've also run it without the muffler and only picked up a few hundred rpm. It doesn't feel worn out, but I am stumped on getting it back to full performance.
Bob
My Feedback: (16)
RE: Welcome to Club SAITO !
72's are bad about the back plate warping and then the intake will move in and out and you will have a intake manifold vacuum leak. They require a new style back plate and new Orings on the intake manifold