In a case of "while Im at it"s, the 19.9 is gonna be moderately disassembled this Sunday. My clutch spring fell off and Ive had a rough time reconnecting it. The whole underside of the tractor is covered in oil and dirt and needs to be washed. So I will be removing the grille and engine, and possibly the dashboard. I see that the clutch spring is held on by a cotter pin, dont really like that. I plan on replacing that with a small eye bolt and a heavier duty spring. While I have the engine out, I will also be replacing the clutch bushing and drive belt. The 16 pops wheelies, thats my gauge. 19.9 doesnt, so therefore, the 19.9's clutch is NOT good enough 
Should be pretty fun, Ill keep you posted
Should be pretty fun, Ill keep you posted