OS 91 FX
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Join Date: Apr 2003
Location: Goldsboro, NC
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RE: OS 91 FX
No, a 2 stroke engine needs back pressure to make abunch of horsepower, this set up is fine for a 4 stroke but all it will do on your 91fx is make it loud, lose horsepower, and wear the motor out. But anyway it is essential that some kind of pipe be on a s stroke to keep exhaust held up alittle. hope this helps