Blue engine mixed with red Troy Bilt---well, that's just a shock to my system.
But $110 for a new engine is hard to beat. Did it bolt right up with no issues?
There are different reverse disks listed in my parts book.
For tiller serial nos. 314151 and up, the part no for the reverse disk is 1919 to be used with part # 1484 transmission drive pulley with flat surface for disk for four speed tiller only.
Two speed tillers Serial nos. 163830 to 314150 use hard fiber disk 1072a with #1287 mounting plate.
Two speed tillers Serial nos. 163829 and below use hard fiber reverse disk 1072K with #1287 mounting plate and #1291 washer.