Thank you everyone for responding to my question, you all have been very helpful! I'll look into some better batteries (S2 or S3's) and probably get some FK-180's for the mod I'm working on.
If you find it hard to source genuine 3240's, I've quoted this from torukmakto's blog
"A hint is that 12900RPM @ 3.0V also identifies a 3240 if the seller doesn't mention which wind their motors are. And stay away from the various other winds of these, the FF metal brush versions, and all the gazillions of FK130SH-xxxx listings. They are NOT what you want."
Link to Source of Info : http://torukmakto4.b...VVNZPLKSv3Wr3PR