Royal Motor Upgrades - How High Do You Want to Get?

[kirbyclassiciii]

To paraphrase Donkey Kong's opening gameplay phrase: "How high do you want to get?"

Anyway, my question is this: for those of you who own a Royal with a 3 amp or older motor assembly (most models manufactured before August 1980), how many of you have tried to take on upgrading it to a higher-amperage motor?

According to the latest version of the Royal service manual, the following upgrades can be used:

To upgrade to a 6.0 amp motor, use these following parts:
#1680001000 Armature (procure from donor 1985 to 1995 Royal)
#1618002000 Field
#2088075000 Motor Plate Assembly (procure from donor 1985-95 Royal)
#2080126000 Rear Bearing (procure from donor 1985-95 Royal)
#1608005000 Fan
#1380261000 Shaft

To upgrade to a 7.0 amp motor, use these following parts:
#1780001000 Armature
#1618002000 Field
#2088075000 Motor Plate Assembly (procure from donor 1985-95 Royal)
#2080126000 Rear Bearing (procure from donor pre-1995 Royal)
#1608005000 Fan
#1380261000 Shaft

Parts Needed for Motor Plate Assembly
#1884003000 Motor Plate (procure from donor pre-1995 Royal)
#1880026000 Ball Bearing (procure from donor pre-1995 Royal)
#1880046000 Tolerance Ring

~Ben