Saito FA-45 - RC Groups
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Oct 21, 2011, 01:01 PM
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Saito FA-45

So after spending two hours searching every forum and the Internet in general and speaking with Horizon directly, I am not any further in finding my answers. Every manual I find does not list the FA-45 specifically.

Here's my problem. I replaced the idle needle with what I thought was the correct part. I cannot get it to idle properly.

What I need to know-
1.what is the correct part number for the idle needle?
2. Is there a difference between an FA-45 and an FA-45MKII?
3. How can I tell the difference without the box?
4. What si the correct engine code? This website says it is C This website shows it in the class of a .50
5. Is the FA-45, specifically the carb and components, interchangeable with .40s or .50s?

I also need a throttle lever. The one I have has threads to connect the throttle lever vs, the typical "grip" and set screw I normally see, like on my Saito 56GK.
1. What is the correct part number for a throttle lever?

Any help is MUCH appreciated.
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Oct 21, 2011, 01:18 PM
The MKI should use the same carb assembly as the 40 and 45MKII as far as I know of...
Oct 21, 2011, 01:20 PM
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I TOBOR's Avatar
Does your carb look like this one? Disregard the intake, I cut the bell off of it so it would clear the firewall in an RCM 40. Here's a shot of my 45MKII and FA 40 side by side.
Last edited by I TOBOR; Oct 21, 2011 at 02:05 PM.
Oct 24, 2011, 11:39 AM
Registered User
Sorry for the delay in responding. Out of town for the weekend and no Internet access.

Tabor- the picture on the left is exactly like mine. Is that an MKII? Do you know the part numbers and where to get the Idle needle and throttle arm/cap? What caused me to go through this is I bent the thumb knob on the idle needle and it broke off.

Worst case, will the carb on a newer 40a fit on the 45MKII?
Last edited by SafetyChain; Oct 24, 2011 at 12:01 PM.
Oct 24, 2011, 11:49 AM
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I TOBOR's Avatar
SC, if you're referring to the left engine in this picture that is the .45MKII
Oct 25, 2011, 03:37 PM
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I am. So I've concluded it is a Saito FA-45 MKII.

Now, anyone know where to get parts?
Oct 25, 2011, 07:49 PM
Methanol, The Cool Fuel !
Gary Cee's Avatar
Do you have the broken pieces ?
Another possible if Saito does not support the parts would be to look at EBay for a parts donor. I am quite surprised if the later needle will not work however.
Oct 25, 2011, 09:14 PM
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Old coot's Avatar
Was looking around ebay found this,

If it`s the correct needle or not I can`t say but worth a look.
This needle can also be found at horizon hobby,Go hobbies likely others. Good chance the needle you`re looking for is still in use but with the screwdriver slot an not the knob.
Oct 25, 2011, 09:47 PM
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I TOBOR's Avatar
The needle on EBAY is far a Saito 40a, the needle he needs would look like this one on this FA40. Tomorrow I'll take that one out and compare it to the 40a LS needle.

PS, Gary i made a velocity stack for the FA40 since I hacked most of the stock one off to clear the firewall in my RCM 40. it used to point straight back like the FA45.
Oct 25, 2011, 10:12 PM
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Old coot's Avatar
Tomorrow I'll take that one out and compare it to the 40a LS needle.
Hi I tobor, It would be great if you do pull that one an check. I found the a scaned copy of the manual for that engine on rcu an going by it the needle does look somewhat a-like but with out that knob but no part numbers, Post 8.
Oct 25, 2011, 11:21 PM
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Jason_WI's Avatar
The saito manual does not list part numbers. I have the FA-45 Mk2 manual in front of me. It just has a part listing and a picture. The throttle arm is 52 and the low speed needle is 56 in the parts listing.

The manual makes for poor toilet paper. Not much in it and half of it is in Japanese.
Oct 26, 2011, 10:13 AM
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I TOBOR's Avatar
OK, the needles are very different with the .40a LS adjuster being the new sleeve type that slides in and out over the catseye slit in the spray bar. Also, note intake pipe seal unique to the .40a and velocity stack I made for the FA .40. I'll put a picture of the 2.20s LS adjuster. On checking OCs links and comparing it to the FA .40 needle it just might wok, it might be worth 3 bucks to find out.
Last edited by I TOBOR; Oct 26, 2011 at 10:36 AM.
Oct 26, 2011, 10:46 AM
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Old coot's Avatar
That needle you have does look alot like the one I was looking at but without the knob though.
Nov 05, 2011, 11:30 PM
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Here is the manual for what it is worth. I like the engine a lot it is a nice engine, if you give it a newer cast muffler (part number SAI5074C ) and connector pipe from like the 56 it is very very quiet. The 56 is the closest engine to it still being sold. The 40s and 50s are very different then your engine.

I would go with part SAI40MK389 as Old Coot pictured above, it should work nice, if you want you could solder a knob or a brass tube with a lever to it. For what it is worth I have never adjusted the low seed needle on 45 I use, my dad set it decades ago. There is no access to it in the plane it is in, and it idles real good and accelerates perfect. I am sure this is because I can not mess it up .

As far as the throttle lever if it looked like what is in the manual I do not think it is available, look like some OS ones but I am sure it is a little different then those. I like this type better then the more common, it is more reliable then the plastic set screw ones they break with age. The worst are the metal ones that are pinned, it always slips. So a metal with a square hole is good.

The 40MKIII and 45MKII were mostly the same as each other. It seems their carb is quite a bit different then other Saitos, it even sticks out in the rear instead of down.. The 45s (not sold in the US) was similar but with the carb and maybe valves of the newer 50 (also no longer being sold) I think. Surprisingly, there are a lot of parts available for the 45MKII still, such as gasket sets. needles, valves, push rods, and small screws and springs for the carb.
Last edited by gzkpez; Nov 05, 2011 at 11:48 PM.
Nov 07, 2011, 10:34 AM
Methanol, The Cool Fuel !
Gary Cee's Avatar

If you have the remaining pieces, or if someone (Itobor??) can loan a pattern or supply a drawing, I will be happy to make a replacement up for you.

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