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I've been working on a little project lately. I have a 54cc Homelite 330 chainsaw engine set up on an old mountain bike frame to make myself a litte motorcycle, and I'm having a little bit of trouble figuring out the air cleaner set-up. The motor originally pulled air through the choke cover through a filter mounted at one end. This was all part of an outer housing that I removed because it was too bulky. I've solved the now-lack-of-a-choke with a primer system, but I need to fab some sort of air horn to connect the air filter to the carburetor. I know that HDPE (recycling number 2) is gasoline-resistant, but I can't find any sort of tube to connect to the filter. I need to make a 90 degree bend in the intake tube to clear the top of the frame. Any ideas as to what I could use? I know PVC isn't gas-resistant, and this may be exposed to fuel from the primer or carburetor. What about PET (plastic bottle material)?