OS 40SF Engine - Quality? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-14-2004, 10:31 PM   #1
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OS 40SF Engine - Quality?

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Anyone fly these engines. The ABC or Ringed? Give me some idea's on their quality? Durability? Are they both your typical OS engine. Keep's going and going, and going?

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Old 05-15-2004, 12:22 AM   #2
salty morgan
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i thnk they're great

it was my first motor, it's in it's third airplane. about three gallons burned in it to date.

it turns a master airscrew 10X6 15000 rpm plus.

it's ringed,

other than that i don't have ennough experience to draw from. i like it.
i do like to buy other peoples junk...

Bob the Builder is my pilot.

i wish i were more gruntled.

ch 41
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Old 05-15-2004, 12:26 AM   #3
Cecil Marshall
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I have two OS 46 SFs. One is ringed, one isn't..
Both are "sweet running" engines..Lots of power,user friendly, and easy to start... Both of mine, when set up properly, will hand start by "bumping" backwards against compression..
The SF engines where the "fore-runners" to the "FX series" and their "liners" didn't peel like some of the FXs (mine for one)...A real "solid engine"........
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Old 05-15-2004, 08:15 AM   #4
Gary Maker
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This is just my personal opinion and as far as I am concerned, the OS 40SF is one of the best, most relyable little engines ever produced by OS. As Cecil as stated, once you get them set up properly, leave it alone and only do minor top end adjustments only if needed and you'll have an engine thats easy to start, relyable, and as they say: "It takes a lickin and keeps on tickin!"

As with all engines: You should take good care of it and it will take good care of you. Never run an engine too lean, ever! At the end of the flying session, start it up, leave the ni-starter connected, disconnect or pinch off the fuel supply and run the engine dry. Give it a few more flips to insure that ALL the fuel is burned out of the system. Put in a few drops of after run oil of your choice in the carb and turn the prop forward, and backwards to suck oil into the main bearings. Always empty the fuel tank before putting it away for the next time you go flying! You'll have an engine that will last for years!

As far as I am concerned, this is one sweet little engine and you can't go wrong and you'll be happy with the purchase of this engine!
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