Hummm... I am also novice, but have bought 3 Victa's (second hand) and one engine, all powertorque. Two of them are VEX60, one VE40, and standalone engine don't know...will verify tomorrow...
I opened only VEX60 carb, and spring is purple?!?
Will be opening other 3 these days, so might be able to give some more info...
Just to clarify - top spring is the one that between metal plate that holds diaphragm and plastic cover, and for jets it would help if you post some pictures and explain...or maybe it will be clearer to me what to look in a jet when I disassemble all 4

Will post pictures as soon as I open them all
