175 Piston Part Numbers

[vmx1963]

Chaps, can someone with a parts list for the 72-75 175 engine tell me what size piston is mine with "63.75 2 Elko 1149d" stamped on the top.  Is this a 2nd OS? And also the part numbers for the standard & oversize pistons?  I'm taking a trip to see an old KTM dealer who's got a "box of parts" and hoping to find some treasures.

Thanks heaps

VMX1963
Western Australia
VMX KTM

[john durrill]

VMX,
 The 63.75 mm is a 1st over. Std bore is 63.5 mm
 Part #'s for the pistons from our 75 book are
Std 52.30.007.000
1st over 52.30.007.200
2nd over 52.30.007.300
3rd over 52.30.007.400
4th over 52.30.007.500
5th over 52.30.007.600
 watch and make sure you get the right piston. their are short  6 fin cylinder( late76 and up) pistons and the longer ones that fit the 7 fin cylinders that have the fins cast around the iron cylinder and ports, 72 to early 76 cylinders.
Hope this helps .
Cheers mate,
John D.

[vmx1963]

Fantastic!  Many thanks John, really appreciate it.

VMX1963
Western Australia
VMX KTM