Saito FA 72 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-11-2011, 11:02 PM   #1
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Smile Saito FA 72

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I have recently aquired the above mentioned used 4 stroke engine. I have no idea what the factory set is for the carb. All the way in and turn out???

I have ran it, but only for a few seconds at a time as it keeps konking out.

Also, what oil should be used for the rocker arms inside the valve covers? WHen I first opened her up, one valve was seized. Had to remove the rocker and gently persuade it to open and shut. It was a bit sticky, but got her moving, got compression and she did fire up.

Any help would be great.

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Old 04-11-2011, 11:45 PM   #2
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Re: Saito FA 72

The high speed needle should be about 4 turns out, then turn in to lean out to an optimal setting. I think mine ran well about 3 turns out. The low speed adjustment screw should be flush with the throttle arm or just slightly in from there. I just used after run oil to lube the rocker arms, not sure if there's something better but it worked fine for me. If you have the spacer tool for adjusting the rocker arm height, that works good.
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Old 04-12-2011, 08:22 AM   #3
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Re: Saito FA 72


The Saito 72 originally had a problem with the carburettor vibrating. This would cause air leaks around the "O" ring where the tube goes from the carb to the head. This air leak also made the engine hard to adjust.

To fix it, you had to install a new back plate that had extra support for the carb to stop the excessive vibration.

Here is the part number:
Saito 72 backplate part # SAI82B17 - it was around $10 last time I looked.

You can search for confirmation of the problem on Google.

Also, if it is a used engine, make sure you set the valve clearance properly.

Hope this helps.


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