Saito FA-72B question. - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-08-2012, 10:56 PM   #1
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Saito FA-72B question.

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Hi. I have a brand new Saito 72 and I have moved the low speed needle during a blonde moment.....not realizing that Saito has it preset from the factory for initial break-in. Does anyone here know how many turns open the low speed needle should be from the full closed position for the initial run in of the engine? Thanks for your help!

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Old 07-09-2012, 01:20 AM   #2
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Smile Re: Saito FA-72B question.

Hi Chris:
I got this info from the website shown below and confirmed this info from the manual on p.10 that says the "factory setting" has the head of the idle speed needle flush with the surface of the (plastic) throttle arm housing. Checking one of my Saito 72's that's in several pieces right now, I counted about 3 1/2 turns out. The head of the needle was slightly "below flush" because this motor was run several times and had the idle set to be fairly reliable after being "broken in" at the time.

"It is standard practice to start the engine with the throttle opened just above idle, or up to 1/4 throttle. At low throttle the high-speed mixture needle has almost no effect; the low-speed needle almost totally controls the fuel mixture seen by the engine. If the low-speed needle is turned in too far (too lean) the engine will start on a prime but not continue running. Try resetting the low-speed brass needle with its top flush with the housing as explained elsewhere on this web site." ---- (see the link shown above).

Hope this info helps. As the motor gets more run time and gets "broken in", the high speed needle will probably be re-adjusted, which can affect the setting for the idle speed needle requiring it to be adjusted slightly.
Wayne Pinke
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Old 07-09-2012, 06:02 AM   #3
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Re: Saito FA-72B question.

join club Saito on RCG

Recommended: velocity stack and foam air filter to keep it from spitting out the carb so much, I'll look up the part numbers.
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Old 07-09-2012, 07:32 AM   #4
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Re: Saito FA-72B question.

Close the throttle on a small "T" pin then blow through the carb fuel inlet and adjust the low speed needle so you can just hear the air in the carb. That will be a good place to start. To adjust the high speed, open the throttle and blow in the carb fuel inlet and adjust the high speed so the quantity of air is almost cut in half. Again a good place to start.

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Old 07-09-2012, 07:57 PM   #5
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Re: Saito FA-72B question.

Thanks guys! And Wayne, I don't know how I missed that info in my manual. You are correct, everything is right there on page 10.....
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