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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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O.S. Flex FS70-91S/70U/FL70/FS81A 330mm 1111D Add to Wish List
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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.

FEATURES: 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.

INCLUDES: 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

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

SPECS: 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)

COMMENTS: 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 ir/jl updated jpg 11/8/06

– If you need more information, use these O.S. resources –
Web Site:
Phone: 217-398-8970
  Postal Address:

Click here for Units of Measure Conversion Calculators

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 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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