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ID old OS 45

Old 10-14-2004, 06:06 PM
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scottm
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Default ID old OS 45

I have an old OS engine I want to identify. It says .45 on case and crank, and 4BK on the carb. Here is a pic of the internals. It is a ringed engine and in very good condition.

My guess is a 45 FSR or 45 SF
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Old 10-14-2004, 06:22 PM
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XTRA230
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Default RE: ID old OS 45

HI
Looks to me like an 45 FSR great engine had 1 years ago went like Boy oh boy stiil great engine but do not no what parts would be like It had now since been superseeded by in order to best of my knowledge SF FX and latest AX
Great engine
ROB
Old 10-14-2004, 06:25 PM
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scottm
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Default RE: ID old OS 45

Thanks Extra, what era was it made? Mid 80's?
Old 10-15-2004, 08:27 AM
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Default RE: ID old OS 45

I put it back together last night and bench ran it. It says OS Max and 45 F on the case. It runs good, it hit 12,800 rpm with a 10-6 and 20% heli fuel. Here is another look.
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Old 10-15-2004, 10:43 AM
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Bax
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Default RE: ID old OS 45

You have the O.S. Max .45 FSR. Run it well and you'll enjoy it for quite a while. Once it wears out, though, it's done. Parts for the FSR-series engines are no longer available from O.S. though you can still get bearings for it, and there's at least one independent maker of piston rings, so there's still a lot of useful life left in your engine.
Old 10-15-2004, 11:26 AM
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scottm
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Default RE: ID old OS 45

Thanks Bill. When was it made? Mid 80's?
Old 10-15-2004, 01:58 PM
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Default RE: ID old OS 45

The O.S. Max .45 FSR went out of production in the mid-80's or so.

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