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O.S. - OSMG2684 OSM72108100 72108100 531028601888 4531028601888
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  Tech Notes

Possible Substitutions

Parts Compatibility

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O.S. Flex FS70-91S/70U/FL70/FS/81A 120mm 1111A
O.S. Flex FS70-91S/70U/FL70/FS/81A 120mm 1111A
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O.S. Flex FS70-91S/70U/FL70/FS/81A 120mm 1111A Add to Wish List
59.20  Buy Now 2.78  
O.S. Flex FS70-91S/70U/FL70/FS/81A 120mm 1111A Add to Wish List
88.32  Buy Now 4.65  
O.S. Flex FS70-91S/70U/FL70/FS/81A 120mm 1111A Add to Wish List
146.45  Buy Now 8.50  

Tech Notes
This Flexible Tubing Replaces your Existing Header and Allows you to
Re-Route your Silencer Farther Away from the Engine or Cowl.
This ONLY Fits the Following Engine(s):
FS-90 (old), FS-120 (old), FS-70 Surpass, FS-91 Surpass, FT-120 II, FT-160


Uses the silencer that came with the engine (it replaces the header)
Comes in 2 lengths 120mm (this one) and 240mm (OSMG2672)
Reroutes the Exhaust to a More Convenient Location


One Flexible Exhaust Tube
Two Pipe Nuts


Length (neglecting threaded part): 120mm (4.72")
Length (overall): 143mm (5.63")
Thread Size on Nut: 10.5mm
Diameter of Flex Pipe: 12mm (.47")


This pipe should NOT be bent in a diameter that is less than
4 times the radius of the pipe (44mm or 1.73")
Bends in the pipe should be as far as possible AWAY from the
threaded part of the pipe. Final adjustment should be made in steps
of only 2-3 at a time. Repeated adjustment to alter the shape
of the pipe will weaken the pipe and cause it to break.
It is recommended that you use the EX exhaust headers with this
flex pipe if you need a bend right at the exhaust outlet on the
cylinder head.
These are available in a "within fuselage" configuration
(OSMG2624) and a "outside fuselage" configuration (OSMG2625).
JBN 3.28.94

– 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:

Click here for Units of Measure Conversion Calculators

Parts Compatibility
Parts Compatibility for O.S. Flex FS70-91S/70U/FL70/FS/81A 120mm 1111A
This item is an optional part for the following:
 LXEXP5 O.S. FS-70 Ultimate 4-Stroke w/Pump  (Parts List)
 LXSZW5 O.S. 81FS-a Alpha Series Ringed 4-Stroke w/Muffler  (Parts List)
 LXBY68 O.S. FT-160 Gemini Twin-Cylinder Ringed 4-Stroke Engine  (Parts List)
 LXWY29 O.S. Carburetor #60R FS70SII  (Parts List)
 LXCA59 O.S. Carburetor #60N FS91SIIP  (Parts List)

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