Hi Bax and thanks for the reply.

While that may be true for the original OS Surpass series, I don't think this is true for the FS II Surpass Series. I've looked all over this engine and I just don't see any vent. Here are a few pics I took of the engine for your reference. Can you shed some light on how to handle this?

http://www.kulkarnicorp.com/~dms12/engine1.jpg
http://www.kulkarnicorp.com/~dms12/engine2.jpg
http://www.kulkarnicorp.com/~dms12/engine3.jpg
http://www.kulkarnicorp.com/~dms12/engine4.jpg