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O.S. - OSMG2689 OSM72108130 72108130 531028601918 4531028601918
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  Tech Notes

Parts Compatibility

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O.S. Flex FS70-91S/70U/FL70/FS81A 330mm 1111D
O.S. Flex FS70-91S/70U/FL70/FS81A 330mm 1111D
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Tech Notes
This is the Flexible Exhaust Extension for the O.S. Max FS-70
and the FS-91 Surpass Four Stroke Engines.
This flex pipe allows you to re-route your silencer further away from the
engine or cowl.


Uses the silencer (muffler) that came with the engine.
Re-routes the exhaust to a more convenient location.
Fits all FS-70 and FS-91 Surpass and Surpass II's.


One Flexible Exhaust Extension for the O.S. Max FS-70 and the FS-91
Surpass Four Stroke Engines with two locknuts and instruction sheet


Threading pipe into exhaust port of engine until it stops, then
tightening locknut. Supporting end where silencer is attached to
avoid vibration.


Length: 12-3/4" (324mm) not including threaded ends
Length: 13-7/8" (353mm) overall
Diameter of flex pipe: 7/16" (11mm)
Inner Diameter: 1/4" (8mm)
Thread size, both ends: M11x.75 (pitch)


Bends in the pipe should be made as far away as possible from the
threaded ends. Final adjustment should be made in steps of only 2-
3 degrees at a time. Repeated adjustment to change the shape of
the pipe may weaken the pipe and cause it to break.
JXS 4/16/01
updated jpg 11/8/06

– If you need more information, use these O.S. resources –
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
  Postal Address:

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Parts Compatibility
Parts Compatibility for O.S. Flex FS70-91S/70U/FL70/FS81A 330mm 1111D
This item is an optional part for the following:
 LXEXP5 O.S. FS-70 Ultimate 4-Stroke w/Pump  (Parts List)
 LXBY61 O.S. FS-91 II Surpass 4-Stroke Ringed w/Pump  (Parts List)
 LXSY82 O.S. FS-91 II Surpass 4-Stroke Ringed w/o Pump  (Parts List)
 LXSZW5 O.S. 81FS-a Alpha Series Ringed 4-Stroke w/Muffler  (Parts List)
 LXWY29 O.S. Carburetor #60R FS70SII  (Parts List)
 LXCA59 O.S. Carburetor #60N FS91SIIP  (Parts List)

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