Thanks for the info, I forgot to say that I did replace the teaser spring, is used a 1/2" long brass bushing.
I did not however use the split lock washer because I was useing one in the old clutch set up and I belive it was causeing part of the slipping problem I was haveing. I burnt out the fibor clutch last fall plowing the garden and am hopeing to get the remainder of the garden plowed this spring without burning up the new aluminum disk. Time will tell.
If you were using the split washer with a stock spring and stock disk, it probably was one of the contributing factors to your clutch going out. The split washers exert quite a bit of outward force on the pressure plates and the stock spring is pretty marginal anyway. For plowing and other yard/garden work, I would recomend that you use a fiber disk with a blue (color coded ISO die spring) and put a little more preload on the spring than normal. Also, the fiber disks are not much thicker than the lock washer is when flattened. So, the washer may have been bottomed out and holding the pressure plates apart. A split washer with the fiber disks really isn't benificial. It is just about a necessity with the aluminum disks.
A friend has given me a 12HP Kohler to replace the 7HP one on my original. I see that I'd have to cut off the welded nuts as the 12HP engine must be bolted up from the bottom. I'd also have to cut the lower panel of the tractor under the engine to clear the deep sump.
Would that weaken the tractor? Am I looking a creating more problem than the 12HP engine is worth?
The center drive pulleys are different (1/2" vs. 5/8" belt), the front hanger locations are offset differently, and parts of the subframes are different....when compared to 44" decks for the xx8/9 and xx00/50 series.
BUT...they are easily convertable....my 782 wears a 44A deck that was once on a 1650.