McCulloch Kart Racing Engine Replacement Parts ( part numbers ) Recoil starter Kits Complete kit - fits all Mc kart engines except Mc 10, Mc 101A/A Complete kit - Mc 101A/A ======================================== Flywheels 5 degree advanced ................................. 68280 Standard ...................................................................68281 Flywheel puller .......................................................51787B ========================================= Cylinder Heads High compression -Mc 6 type ..................................84496 High compression additional cooling fin area ; MC90, Mc91, MC91A, Mc 91B....................................87160 Mc 100, Mc 101 ........................................................66023 Mc 101A ..................................................................64309 ========================================= Bolt connecting rod ( SAE Grade 9, rolled & rerolled, 210,000 PSI ) Mc 7, 8, 9, 90, 91, 91a, 91b ......................................60210a Mc 20, 75, 100, 101, 101a ........................................47819a Mc 101 101A/A Spline head ...........10 pkt ............ 110720z ========================================= Wrist pins Mc 9, 40, 45, 49e, 90, 91 ...........................................62831 Mc 70, 75, 100 ..........................................................60207a Mc 101 .....................................................................66034 Mc 91 series Mc 101 series (late model ) ................  69408 ========================================== Needle rollers all engine models pkt of 25 ...............69891x =========================================== Carburetor assy's All engines prior to 1967 ............................................68795 Mc 91 series ...............................................................84446 Mc 101A/A ... High Capacity .......................................85162 Carburetor body assy Mc 91, 91A, Mc 101 ....................................................68907 Carby adaptor assy Mc 91, 91a, 91b Mc 101, Mc 101a ...............................68889 Carby parts ( fuel valve body and needle Needle set all models ................................................85059 Needle valve ..............................................................63038 Needle valve body .....................................................58969 Valve washer .............................................................55889 Kit, high capacity needle and valve ( pressure pulse carby ) Mc 91, 91a, 101. ..........................................................66409 Needle valve body pressure pulse carby Mc 91, 91a, 101 ...........................................................66407 Booklet pressure pulse carby Mc 91, 91a, 101. .........ST-136 Carby reed valves Mc 91, 91a, 91b, 101, 101a. .........................................68074 . Carby reed block and valve Mc 91, 91a, 91b, 101, 101a. .........................................68091 Carby Diaphram   (fuel pump) ...................................57274b Mc 91m 91a, 91b, 101, 101a ..(control) .......................66092 Breaker point assy's Mc 20, 30, 40, 45, 70, 100, 101 series ..........................57765b Mc 90 series Mc 49 series ..........................................50076a Condensors all kart engines ......................................85358 Piston pin tool set ( all kart engines proir to 1967) .....62459a Holding block .............................................................62461 Piston bearing driver ..................................................62462 Piston pin driver .........................................................62463a Blind Piston service kits ( For installation and removal of pins and bearings ) Mc 91series ( 2,165" to 2.175") .....................................83205 Mc 101 series ( 2.280" to 2.310") ..................................83207 Timing guide 26 degree BTDC, all kart engines ................................65712 Kart engine manuals Mc 91 series Mc 101 series ........ 85205 Mc 49e .........................................................................87756

Piston assy's Mc 49 std 50206        .020 50134 Mc 49c, 49e std 53927 ... .010 53925 ... ,020 53925 ... .030 53926 Mc 40, 45, 90. std 47765 ... .010 47766 Mc 75, 100 std 47902 ... .010  47856 ... .020 47857 ... ,030 47858 Mc 91, 91a, 91b, 91b/1 std 68898 ... .005 68899 .... .010 68897 Mc 101   std 67089 .... .010 67091 .... .020 67092 .... .030 67093 Mc 101a   std 84469 ... 010 84470 ... 020 84473 ... 030 84474 ...050 84476 Ring sets Mc 49 ........... std 55123 ... 020 55125 Mc 49c, 49e   std 48691 ...010 48692 ... 020 48693 Mc 40, 45, 90 std 47767 ...010 47768 Mc 75, 100     std 47826   010 47863 .... 020 47864 ... 030 47865 Mc 91, 91a 91b, 91b/1 std 47767 ... 005 66790 ... 020 47768 Mc 101   std 47865 ... 010 66048 ... 020 66047 ... 030 66045 Mc 101a, 101A/A  std 47865 ... 010 66048 ... 020 66047 ... 030 66045