to do any sort of transmission work is going to involve dropping the engine and splitting the cases. to a lot of people the first reaction is "ZOMG!" but its really not that hard. the bottom end is sooo much easier to work with than the top end. cost - without looking at fiche charts, assuming your going to order new gears, AND assuming its similar setup to mine, its probably going to be around 200-250 dollars, depending on how much the 2nd/6th gears are, gaskets, misc items, and any oops mistakes along the way. as long as your semi decent in organization, have a decent area to work with and are handy with a wrench your golden. the only special tools you need to buy are snapring pliers, clutch holder (can be bought and returned at your local shop...), and adjuster bolt tool (can be cheaply made out of cutting sockets instead of buying the $70 yamaha tool). again this is assuming its a lot like mine, which i believe it is. and i've never done anything like this before, cars or bikes, and it wasn't hard at all. link to my progress