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Yeah - this approach seems to be a better one... If you continue to dump the returned fuel into the existing tank, you'll always end up with fuel in the auxiliary tank when the existing tank is empty. This is because the fuel return line generally has air bubbles in it, which will reduce the amount of fuel that gets sucked into the existing tank.
If you mount things to the motor mount support, do it by clamping to the mount, not drilling through it. Trust me on that.
When I first decided to build a motorized bike, I was pretty much set on the Honda GX35 engine, with a Staton friction drive. But after reading all the positive comments on the GEBE setup, I may go with that instead. Only I would get the EHO35 35cc Robin/Subaru 4 stroke engine. It is an expensive setup, and has a couple of drawbacks for me. Unlike the Staton setup, there is no room to mount a basket on top of the friction drive assembly. But apparently you can mount panniers to the sides of the GEBE support, so that should work. The other thing is how the drive ring mounts to the wheel. It only attaches to the spokes on one side of the wheel. Having been a long time bike rider, and having some degree of skill/experience in wheel building, to me this is not a good thing, I would rather have a hub mounted pulley. But, I have yet to hear of any problems caused by this, so it must be stronger than it seems like it would be, and my bike has a lot stronger wheels than the walmart bikes I see their kit installed on on their site.
I have no need for speed, 20 mph is fine, what I need is range. I would like to go on 300-400 mile trips on it.