Matt G - well, you caught me again. The cases have the same part number but the 30 tooth gears have different part numbers. I guess if you want to swap the 15 tooth thrower gear with the 20 tooth tiller gear, you also have to swap the 30 tooth thrower gear for a 30 tooth tiller gear. The part numbers for the 30 tooth gears are different so I guess the gears are somehow differnt and fit the same box.
Matt M - my earlier post was wrong about swapping the 15 and 20 tooth gears. Can't just do that. So the question becomes what size pulley to use on the input side, and if there is a belt length issue. I can't do the calculation but since the pulley used for the 5/8" belt version has a 5" OD I'd guess a 4" OD should get you close to a similar total output speed. Don't know what effect it would have on belt length tho - and that belt is so long that when you use a smaller pulley it would probably need alot more tension to stay on.
Kraig - Oh Great One Keeper of the Photos - can you put a BIG RED LINE thru my earlier post on swapping the 15 and 20 tooth gears. If not can you at least put a BIG RED STAMP on it that says WRONG!!!! (Courtesy of Matt G).
Marlin H - can't quite understand that. Seems to me if you get up at 4AM or 9AM black coffee would still require the same amount of time to warm your engine and frame up.