Sx2 Gearing

[Rob_B]

Ran my sx2 four or 5 times since new, on inspection i have noticed that it looks like a small stone may have got in and has knackered the teeth slightly on the idler gears, tried to order some but everywere out of stock of the kit ones i think 24/33. what difference would it make if i were to change these round? Would i have to change spur size pinion etc? Will be running a 5.5. Thanks