that opening is venting to the atmoshpere with a hose. I doubt there is much restriction in it but i'll check it out tonite.thanks for the help
ya i vented it. anyway theres a blockoff plate on the front of the engine, the gassers had a fitting there that went to the top vent. im thinking about drilling a hole in that and running a hose up to the top tube. does anyone see any problems with this?