Those kits look nice but I won't use chinese parts and engines, I was looking at the staton gear box (16 to 1) the assembly looks pretty simple, just changing out the crankshaft.It is a little pricey but worth it if it lasts and works well.He claims this new gear box is "whisper quiet".I would have to call him and talk about chains, like how many would I need etc.My town is built on the foot of a sloping hillside, not big hills.My old GEBE w/ suburu 35 couls do it with a running start but it would bog down to 5-7 mph.I would like to be able to maintain a good cruising speed.This way I could zip up these grades without any trouble.I am debating on the ghx 50 f/d or the gx35 crank shaft kit, both pricey.Again, I am not sure if I would need to drive every rear sprocket or just one, I wish he had pics of the install unless I am missing something..Thanks !!