McCulloch piston pin ( wrist pin ) lengths and diameters.

MC5 1960 ............. 57198 ...... thrust/washers .................................. MC6 1961 ............. 57198 ...... t/w .................................................... MC7 1962 ............. 58132 ...... t/w .................................................... MC8 1963 ............. 58132 ..... closed needle bearing ...................... MC9 1964 ............. 58132 ..... cnb ................................................. MC90 1966 MC91 1966 91A .... 62831...... 1968 91B .............  69408 ........................................................... 1/2" ............................ 1 5/16" .................... 1970 91B/1 ........... 69408 ........................................................... 1/2" ............................ 1 5/16" .................... 1970 91C .............. 69408 ........................................................... 1/2" ............................ 1 5/16" ................... 1972 91M/C 1973 .. 69408 ........................................................... 1/2" ............................ 1 5/16" ................... MC92 1974 ............69408 ........................................................... 1/2" ............................ 1 5/16" ................... MC93 1977 ............69408............................................................ 1/2" ............................ 1 5/16" ...................

MC10 .................... 57198 ..................................... cnb ............ MC20 .................... 58132 ....... t/w ........................................... MC30 .................... 58132 ....... t/w ........................................... MC40 .................... 58132 .................................... cnb ............. MC-45D ................. 58132 .................................... cnb ............. MC70 .................... 47810 .................................... cnb .............. 9/16" ................ MC75 .................... 47810 .................................... cnb .............. 9/16" ................ MC100 1966 .......... 47810 .................................... cnb .............. 9/16" ................ MC101 1967 .......... 69408 .......................................................... 1/2" ................. MC101A 1969 ........ 66034 .......................................................... 9/16" ............................ 1 5/16" ................. MC101AA 1972 .........  ? ................................................................................................................................ MC101B 1974 ........ 69408 .......................................................... 1/2" .............................. 1 5/16" ................. MC101C 1969 ........ 69408 .......................................................... 1/2" .............................. MC101C 1969 ........ 66034 .......................................................... 9/16" ............................ 1 5/16" ................ MC101D 1971 ........ 69408 .......................................................... 1/2" .............................. MC101M/C 1973 .... 69408 ........................................................... 1/2" ..............................

McCulloch Model ..........................................................Wrist pin diameter .................... Wrist Pin length

Mc-70s, 75s, 100s, and 1st generation Mc-101s came with 9/16" wrist pins.

The 5/8" wrist pin Wiseco 101 "9" port pistons were p/n's 1006PS thru 1006P9

Wiseco 5/8" wrist pin was p/n 575, while the Wiseco 91B & 101A wrist pin was p/n 591

The Wiseco 1007PS, 1007P1-P6 (standard, +0.010 thru +0.060") pistons use a standard 1/2" diameter wrist pin.

Found this info in the Number 8 Wiseco catalog (circa 1970 - based on the most current mac motors in there being the MC49C, MC91B and MC101A) The 9/16" rod/wrist pin was used with the MC70-75-100 and Wiseco 101 pistons (but not the Wiseco 101A piston). The Wiseco 5/8" wrist pin was p/n 575, while the Wiseco 91B & 101A wrist pin was p/n 591. The 9/16" wrist pin Wiseco 101 "9" port pistons were p/n's 1006PS thru 1006P9 (std thru +0.090 in steps of +0.010)

Standard Series Engines

Super Series Engines

McCulloch Piston Pin, part number 66034. Made for the Mc-101, and Mc-101C engines.    This wrist pin measures approximately 9/16 inches in diameter by 1 5/16 inches long.

McCulloch closed Pressed in Piston Pin, part number 89204.    Made for the Mc-101D, and Mc-101B engines.

9/16" pin, some of the big saws and late saws used those pins as well as the kart motors listed. Super Pro 105 and Super Pro 125Cs use a full length 9/16" pin that you could always grind shorter, pn89204. Same rod and pin the chrome bore kart motors used. I think the 797 and Super 797 also used them which is basically what a Mc- 101 is.

Wrist pin part numbers Mac 6 104378 closed end Mac 6 101206 open ended ====================================== Mac 7 104378 closed end Mac 7 101206 open ended ====================================== Mac 8 104378 closed end Mac 8 101206 open ended ====================================== Mac 9 104378 closed end Mac 9 101206 open ended ====================================== Mac 10 101206 open ended Mac 10 104378 closed end ======================================= Mac 20 101206 open ended Mac 20 104378 closed end ======================================= Mac 30 101206 open ended Mac 30 104378 closed end ======================================= Mac 40 101206 open ended Mac 40 104378 closed end ======================================= Mac 45d 101206 open ended Mac 45d 104378 closed end ======================================= Mac 45 101206 open ended Mac 45 104378 closed end ====================================== Mac 49 101206 open ended ....m/c ... c Mac 49 104378 closed end ... m/c ... c ====================================== Mac 70 110107 open ended Mac 70 110108 closed end ====================================== Mac 75 110107 open ended Mac 75 110108 closed end ====================================== Mac 91 (A) Mac 91 (B) Mac 91a (C) Mac 91C (D) Mac 91B (E) Mac 91 101206 open ended A/B/C/D mAC 91 104519 open ended E ====================================== Mac 92-93 104519 both ends open ====================================== McCULLOCH Wrist Pin needle Bearing 110107 Mac 100 open ended 110108 Mac 100 closed end ====================================== Mac 101 110107 open ended ( A,B.C ) Mac 101 104519 open ended (D) ====================================== mAC 101B 104519 open ended ====================================== Mac 101D 104519 open ended MCCULLOCH Wrist Pin Needle Bearing 104378 ........... 17mm in o/d, the i/d measures 13mm and the height measures 12mm and is a closed end Mc-49C/E, Mc-10, Mc-20, Mc-8, and Mc-90 engines. =============================================