question about os engines
05-24-2011, 04:22 PM
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question about os engines
I would like to know what the difference is between a OS-FS-91 II surpass 4 stroke and a OS-FS-91 surpass 4 stroke NIB? Thank you.
05-24-2011, 04:37 PM
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RE: question about os engines
If you go into the glow engine forum then to the OS support you can ask Bill Baxter directly. I can't recall if there was a power increase or not. There was a change in the low end adjustment as I recall and the IIs have the crank case pressure line now going directly into the intake manifold instead of just venting out the back. A few cosmetic changes. Bill can give you all the facts or there may be a thread asking the same question in that forum.
