For a little over two months now I've been riding a Staton-inc axle-mounted kit using a Robin-Subaru 35cc (technically it's 33.5cc) 4-stroke engine and a 12 tooth sprocket on the gearbox (and a 60 tooth sprocket on the freewheel). I have some questions which I'd like to ask on this website but I don't know if I need to start a thread in order to do that and, if so, how to do that. Any suggestions? Basically, I want to know if any other hefty folks (250 lbs plus) have this particular kit with this particular engine and also have experience climbing steep hills using a 12 tooth, 11 tooth, or 10 tooth sprocket on the gearbox. With my current 12 tooth I can reach 25 mph on the flats without pedaling, but the engine bogs down too much on steeper hills, even when pedaling with the engine. So I'm wondering if I should get the 11 tooth or the 10 tooth sprocket for more hill climbing power? Or maybe I'm just too fat for a 33.5 cc engine? I'm also wondering what kind of hill climbing power a Grubee Skyhawk frame-mounted 48cc or 49cc 2-stroke happy-time engine has, for example. Any ideas or suggestions? Thanks.