I've added a couple of air outlets behind the cockpit. Hopefully they are enough. They are 60 mm diameter. The hole in the nose is also 60 mm diameter, so there's twice the area out as in, in addition to the other holes in the structure.
I cut away the heat shrink tubing to see what was different from the one I made earlier, and there's one extra wire connected. I haven't checked which pin it is. Could be a different TTL-adapter too. I haven't compared then closely.
Update. I received my cable from http://www.ebay.com/itm/231957511874, and it works with my norwegian BBS02 controller. Happy.
That pinion gear looks really fragile. There's no center section to it so it probably bends under load. Also looks like it has cracks or forming marks on the teeth, but that could be grease.
I already have one home made cable that works with my BBS01 from China, but none of my BBS02 from a norwegian vendor. Fingers crossed. Could be that a different TTL adapter is needed.
Topic: Built a BBS02 bike, mistake?
Re: Built a BBS02 bike, mistake?