Bores , strokes and capacities of McCulloch Chainsaws  Crankshaft PTO style 1. Tapered with keyway 2. Tapered without keyway 3. Stepped  Model .................Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end 1-40...........................50659...............2.125"/ 1.375"...............55009............80cc or 4.9 cu/in.........................3 1-41...........................50659...................................................55009...............................................................3 1-42...........................50659...................................................55009...............................................................3 1-43...........................50659...................................................55009...............................................................3 1-45...........................50659...................................................55009...............................................................3. 1-46...........................50659...................................................55009...............................................................3. ==================================================================== 1-50...........................50659..............2.125"/ 1.375............ 55009............80cc or 4.9 cu/in...............................3 1-51...........................50959...............................................55009....................................................................3 1-52...........................50959...............................................55009....................................................................3 1-53...........................57830..............2.125"/ 1.375..............55009....................................................................3 ==================================================================== 1-60...........................50756..............2.125"/ 1.375.............55009............80cc or 4.9 cu/in.............................. 3 1-61...........................50756...................................................55009.............80cc or 4.9 cu/in .........................3 1-62...........................50756...................................................55009.............80cc or 4.9 cu/in .........................1 1-63...........................50756...................................................55009.............80cc or 4.9 cu/in .........................1 ==================================================================== 1-70...................................................2.125"/ 1.50.......................................90.14cc or 5.5cu/in......................1 1-71...............................................................................................................................................................1 1-72............................................................................................................................................................ 1-75...................................................2.125"/ 1.625........................,,...........95cc or 5.8 cu/in....................... 1-76...........................58128...............2.165"/ 1.635................48905............99cc or 6.04cu/in..........................1 ==================================================================== 1-80............................55257..............2.125"/ 1.500...............55009..............87cc or 5.3 cu/in......................1 1-81............................55756.................................................55009.............................................................1 1-82............................57756.................................................55009.............................................................1 1-85............................58128..............2.125"/ 1.625................48905...............95cc or 5.8 cu/in....................1 1-86............................58128..............2.165"/ 1.635................48905...............99cc or 6.04 cu/in..................1 =================================================================== Mac 15.......................50659a............2.125"/1.375................47903................80cc or 4.9 cu/in.......................3 D-30...........................50025..............2.125"/1.375................50015................80cc or 4.9 cu/in ......................3 D-36...........................50210..............2.125"/1.375................55009................80cc or 4.9 cu/in ......................3 =================================================================== D-44...........................51225..............2.00"/ 1.375..................51220..............72cc or 4.4 cu/in........................1 Super 44..........................................2.125"/ 1.375........................................80cc or 4.9 cu/in.......................1 Super 44a..................55257.............2.125"/ 1.50...................55010..............90.14cc or 5.5 cu/in...................1 D-45.................................................2.125"/ 1.375........................................80cc or 4.9 cu/in Super 55....................55005.............2.125"/ 1.375.................55010..............80cc or 4.9 cu/in........................1 Super 55a.....................................................................................................................................................1 =================================================================== Pro Mac 105...............89222.............2.250"/ 1.635.................88623..........106.5cc or 6.5 cu/in.......................2 SuperPro 105.............89222..................................................88623...............................................................2 =================================================================== CP125.........................69346.............2.280"/ 1.835.................69250.............123cc or 7.5 cu/in........................2 CP125s.......................69346.............2.280"/ 1.835.................69250.................................................................2 Super Pro 125............85476.............2.280"/ 1.835.................85606.................................................................2 Super Pro 125c..........85476.............2.280"/ 1.835 ................88623.................................................................2 =================================================================== 200.............................50659..............2.125"/ 1.375...............55009a.............80cc or 4.9 cu/in.......................3 250.............................50659a............2.125"/ 1.375...............47782a.............80cc or 4.9 cu/in.......................1 250 late......................50659a.............2.125"/ 1.500..............47903...............90.14cc or 5.5 cu/in..................1 Super 250...................60313..............2.125"/ 1.500..............47903...............90.14cc or 5.5 cu/in...................1 Super 250 ..................50659a............2.125"/ 1.375..............47782a.............80cc or 4.9 cu/in........................1 300.............................60313..............2.125"/ 1.50.................47903..............90.14cc or 5.5 cu/in....................1 380.............................60313..............2.125"/ 1.50.................47782a............90.14cc or 5.5 cu/in....................1 380a...........................60313..............2.125"/ 1.50.................47782a............90.14cc or 5.5 cu/in ...................1 440.............................60724..............2.125"/ 1.50.................47782a............90.14cc or 5.5 cu/in ...................1 450.............................60313..............2.125"/ 1.50.................47903............. 90.14 cc or 5.5 cu/in ..................1 =================================================================== 550............................64440...............2.165"/ 1.635................47903............99cc or 6.03 cu/in.......................1 Super 550..................63440..............2.217"/ 1.635................47903...........103cc or 6.3 cu/in.........................1 =================================================================== 640............................50756a..............2.125"/ 1.375................47903.........80cc or 4.9 cu/in...........................1 650............................61860................2.125"/ 1.50.................47903..........90.14cc or 5.5 cu/in......................3 660............................61860................2.125"/ 1.50.................47903..........90.14cc or 5.5 cu/in......................3 =================================================================== 740............................58128................2.165"/ 1.635...............47782a...........99cc or 6.04 cu/in......................1 790.....................................................2.217"/ 1.635...................................103cc or 6.3 cu/in........................1 795............................58128...................................................47903...........103cc or 6.3 cu/in........................1 797............................66010.................2.280"/ 1.835...............66049...........123cc or 7.5 cu/in.......................1 Super 797...........................................2.280"/ 1.835...................................123cc or 7.5 cu/in ......................1 =================================================================== 840............................58132..................2.165"/ 1.635.............47782a...........99cc or 6.04 cu/in......................1 890............................58128..................2.217"/ 1.635.............47782a...........103cc or 6.3 cu/in......................1 895............................58128..................2.217"/ 1.635.............47903.............103cc or 6.3 cu/in......................1 895c..........................89222..................2.217"/ 1.635.............88623.............103cc or 6.3 cu/in......................2 ===================================================================   McCulloch Kart Engines ...Bore and stroke. Super /101 series Model ....................Crank No...........Bore / Stroke.............Conrod No..............Size............................Crank PTO type Mc 10.................55257../..48696 .........2.125"/ 1.50.........................................90.14cc or 5.5 cu/in....................1 Mc 20.................58128 ......................2.125"/ 1.635.........................................................5.8 cu/in....................1 Mc 30.................58128.......................2.165"/ 1.635.........................................106.5 or 6.05 cu/in......................1 Mc 40.................47751.......................2.165"/ 1.635.........................................................6.05 cu/in...................1 Mc 45.................58128.......................2.165"/ 1.635.........................................................6.05 cu/in...................1 Mc 70.................47798.......................2.217"/ 1.835.........................................................7.08 cu/in...................1 Mc 75.................47798a.....................2.250"/ 1.835.........................................................7.29 cu/in...................1 Mc 100/ 1966......47798a.....................2.250"/ 1.835.........................................................7.29 cu/in....................1 Mc 101/ 1967......68898.......................2.280"/ 1.835..............66049..................123cc or...7.5   cu/in....................1 Mc 101a.............69250.......................2.280"/ 1.835..............66049..................................7.5   cu/in Mc 101aa 1972....69346......................2.280"/ 1.835........................................................7.5    cu/in Mc 101b   1974....69346......................2.280"/ 1.835..............66049.................................7.5    cu/in....note 90872 ? Mc 101c...1969....69346......................2.280"/ 1.835..............66049.................................7.5    cu/in Mc 101d...1971.....69346.....................2.280"/ 1.835..............69250.................................7.5    cu/in Mc 101 mc 1973...69346.....................2.280"/ 1.835........................................................7.5    cu/in Mc Culloch 90 series engines Model....................Crank No...........Bore / Stroke...............Conrod No...............Size..........................Crank PTO type MC5 1960.........................50756..............2.125/1.375.................55009..................4.9........................................1 MC6 1961.........................48744..............2.125/1.500..................55009..................5.3.......................................1 MC7 1962.........................48586..............2.165/1.635..................48905................6.05.......................................1 MC8 1963.........................48586b............2.165/1.635..................47782................6.05.......................................1 MC9 1964.........................48586c............2.165/1.635..................47903................6.05.......................................1 MC90 1966..........................48586c...........2.165/1.635..................47903................6.05.......................................1 MC91 1966..........................48586c............2.165/1.635..................47903...............6.05.......................................1 91A...........................48586c............2.165/1.635..................47903...............6.05.......................................1 1968 91B...........................48586c............2.165/1.635..................47903...............6.05.......................................1 1970 91B/1........................48586c............2.165/1.635...................47903...............6.05......................................1 1970 91C............................48586c...........2.165/1.635...................47903..............6.05.......................................1 1972 91M/C........................89140............2.165/1.635...................47903...............6.05...............Straight grove and key 1973 MC92.........................91085............2.165/1.635...................47903...............6.05......................................2 1974 MC93.........................91085a..........2.165/1.635...................47903...............6.05......................................2 1977    Footnote this list has been compiled from my vaste array of Mc IPLS and Mike Acres excellent chainsaw site Engine Capacities of McCulloch Two Man Chainsaws 12-25a .......1948 - 49 .......... 130cc ... 2.250 in. (57mm) x 2.0 in. (51mm) 5-49 .......... 1949 - 52 .......... 130cc ... 2.250 in. (57mm x 2.0 in. (51mm) 7-55 ........... 1951 - 53 ......... 161cc ... 2.50 in. (63.5mm) x 2.00 in. (51mm) 99 .............. 1954 - 63 ......... 161cc ... 2.50 in. (63.5mm) x 2.00 in. (51mm) 1-92 ........... 1961 - 62 ......... 103cc ... 2.217 in. (56.3mm) x 1.635 in. (41.5mm) 1-93 ........... 1962 - 63 ......... 103cc ...  2.217 in. (56.3mm) x 1.635 in. (41.5mm) 940 ............ 1963 - 71 ......... 103cc ... 2.217 in. (56.3mm) x 1.635 in. (41.5mm)