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Mcculloch spec chart
#1
McCulloch 2-CYCLE ENGINES
Listed below are the various models of the McCulloch Engines and some data regarding them.
Model     Engine Use     Bore     Stroke     Displacement     Carburetor           Spark Plug Type     Spark Plug Gap
MC-2       Racing           2.165     1.635        6.05          Tillotson Series HL      *J-6J or AC M-44C     0.025
MC-5      Racing           2.125     1.375        4.9            Tillotson Series HL        J-6J or AC M-44C     0.025
MC-6      Racing           2.125     1.500        5.3            Tillotson Series HL        J-6J or AC M-44C     0.025
MC-7      Racing           2.165     1.635        6.05          Tillotson Series HL        J-6J or AC M-44C     0.025
MC-8      Racing            2.165     1.375       4.9            Tillotson Series HL        J-6J or AC M-44C     0.025
MC-9      Racing           2.165     1.375        4.9            Tillotson Series HL        J-6J or AC M-44C     0.025
MC-10     Racing          2.125     1.500        5.3            Tillotson Series HL        J-6J or AC M-44C     0.025
MC-20     Racing          2.125     1.635        5.8            Tillotson Series HL        J-6J or AC M-44C     0.025
MC-30     Racing          2.165     1.635        6.05          Tillotson Series HL        J-6J or AC M-44C     0.025
MC-40     Racing          2.165     1.635        6.05          Tillotson Series HL        J-6J or AC M-44C     0.025
MC-45     Racing          2.165     1.635        6.05          Tillotson Series HL        J-6J or AC M-44C     0.025
MC-70     Racing          2.217     1.835        7.08          Tillotson Series HL        J-6J or AC M-44C     0.025
MC-75     Racing          2.250     1.835        7.29          Tillotson Series HL        J-6J or AC M-44C     0.025
*Spark Plug Data
          Operating Condition: Average Driving
                              Champion Plug Number = J-6J
                               AC Plug Number = M-44C
          Operating Condition: Light Racing
                               Champion Plug Number = J-4J
                               AC Plug Number = M-42k
(SOURCE: Some of the data are from “Small Engines Service Manual”)


And heres a new more detailed chart maybe a little easier to use
Cool

Mcculloch standard series go kart motors
   
Mcculloch super series motors below

.pdf   Mcculloch specs chart super pdf.pdf (Size: 33.84 KB / Downloads: 174)


[size=undefined][size=undefined][size=undefined]
[url=https://web.archive.org/web/20100215000000/http://macbobaust.com/bores.html][/url][/size]
[/size][/size]


mcbobs old chart
Bores , strokes and capacities of McCulloch Chainsaws  
Crankshaft PTO style

1. Tapered with keyway

2. Tapered without keyway

3. Stepped  


[b][b]Model .............Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end
[/b]
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.
[b]Model .............Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end[/b]

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[/b]


[b][b][b]Model .............Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end[/b]
[/b][/b]


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

[b][b]Model ............Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end
[/b]

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
Model ............Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end
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[/b]

Model .................Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end
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


[b][b]Model ............Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end[/b]
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
=================================================================== 
  [/b]


1. Tapered with keyway
2. Tapered without keyway
3. Stepped 


McCulloch Kart Engines ...Bore and stroke.

Super /101 series
[b][b]Model ..........Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end
[/b]

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[/b]



Mc Culloch 90 series engines

[b][b]Model ..........Crankshaft No ..........Bore/stroke...........Conrod No............Capacity......................Crank pto end
[/b]

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 
[/b]


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)



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.htm   Crank.htm (Size: 11.08 KB / Downloads: 42)
Reply
#2
Heres a mcculoch crank specifications and interchange chart
This print might be more useful here.
   

           
Reply
#3
torque values for a mc motor as set forth by Mike Savin in his booklet "Speed Secrets and Tuning Tips"

torque values
Coil/lamination Screws ------------55-60 inch pounds
Condenser screws ----------------30-35 inch pounds
Con rod - mc49 mc 91 -------------105-110 inch pounds *
Con rod - mc101 ---------------90-95 inch pounds *
*torquing to 110 possibly could result in a cracked caps.i myself do 85-90 inch pounds
Crankcase End Cover Screws --------60-65 inch pounds
Crankcase Bottom screws -------- --95-100 inch pounds
Cylinder Head Screws -------- --55-60 inch pounds
Exhaust Header Screws -------- ----55-60 inch pounds
Fan Housing Screws ----------------55-60 inch pounds
Flywheel nut ----------------------300-360 inch pounds
Spark plug -----------------------216-264 inch pounds
Clutch Nut ------------------------ 260-300 inch pounds

Bonus info:
the following piston to cylinder clearances are recommended
mc49 series .0045 to .0055 inches
mc91 series .0065 to .0075 inches
mc101 series .0070 to .0100 inches

D

  second  bonus
Levi Shepherd

  coil gap .018" and points .018" to start with before timing is set. Make sure your timing light is firing when the timing mark on your flywheel hits the front side of the magnet going from left to right. This will give you a good spark and ensure your timing is not advanced to far. 

To test your condensor you can take a multimeter set on ohm's to charge your condensor (capacitor) by placing the negative lead on the mounting screw and the positive lead of the multimeter on your condensor lead while it is not hooked up. You should be seeing your meter take incremental readings until it over loads.  Quickly switch back to voltage DC and watch your voltage drop back to zero.  This will give you an indication if your condensor is still good.


heres a list of bolt hardware needed on most mcculloch motors

   
Reply
#4
Dave,
Thanks for the info. I have similar stuff but this looks good. The hardware list is helpful also. I bought a bunch of different lengths of UNBRAKO allens based on my past use for the Macs. By the way, appreciate all you do on the forums. I'm sure it takes many hours of time. Very useful info and this new forum looks to be an improvment once we all learn to use it. Thanks again.

John
Reply
#5
(09-21-2016, 05:16 PM)David Luciani Wrote: heres a new consolidated chart maybe a little easier to use
Cool

Mcculloch standard series go kart motors

Mcculloch super series motors below

Some of this is incorrect, where did it come from?
Scott
Reply
#6
Scott,

i posted a fact check request on the other forum in case you missed it.

what did you see that's wrong?

The Charts came from me.
i created them out of several different charts that i have and off the net.
some of the info seems wrong to me but i've been too busy to totally research every point and fact check it.

i've had this lying around for a long time and decided i'd never get around to fixing it.
so i posted here  it warts and all.

So rather than wait for me to have time it seemed a good idea to put it  here and let people tell me the errors.
t's easy enough to fix.

the crank specs sheet i got from an old cd somebody sent me years ago.
that section i was especially hesitant to post as the specs on each year is something i'm not totally sure of myself.

but again easy enough to fix if theres errors.


dave l.
Reply
#7
Hi Dave,

Thanks for consolidating a lot of the McColloch info. I wish I knew a fraction of what you and some of the other guys know about these engines. I came across the thread on the other forum about the spec sheets. I recently acquired an
MC 101a/a and wish to learn as much as possible about it. Mr. Steve O'Hara and some of the other guys were kind to share their experience and knowledge.

I'm not sure what specifically Scott was referring to in his post on this thread, but I did notice the MC101 Super Series engines are listed as 100cc. I think they should be listed as 123cc. Just like you said though, it's an easy fix...
Reply
#8
another chart
McCulloch Kart Engine Identification Numbers.

Production Period

MC-1 ....................................................................................9/61 to 1/62
MC-2 ....................................................................................2/62 to 4/62
MC-5 ....................................................................................2/60 to 6/60
MC-6 ....................................................................................6/60 to 10/61
MC-7 ....................................................................................2/62 to 10/62
MC-8 ....................................................................................2/63 to 11/63
MC-9 ....................................................................................2/64 to 5/65
MC10 ...................................................................................6/59 to 2/61
MC-20 ..................................................................................3/61 to 2/62
MC-30 ..................................................................................2/62 to 10/62
MC-40 ..................................................................................2/62 to 10/63
MC-45 ..................................................................................2/64 to 4/64
MC-45D ...............................................................................4/64 to 6/64
MC-49 ..................................................................................4/66 to 5/68

400160 Serial number Prefix ...13 ............. MC49C . 6/68 to 6/72
400160 ........................................14........MC49E 6/72 to 8/76
400162.........................................10 .......MC49 M/C . 3/73 to 6/75

MC-70 ..................................................................................3/63 to 5/63
MC-75 ..................................................................................1/64 to 3/65
MC-90 ..................................................................................2/66 to 4/66

400165 .........................................10.......MC 91 12/66 to 4/68
400165..........................................11 ......MC91A 5/68 to 5/70
400165...........................A12,A13 ... ........MC91B 6/70 to 10/74
400165..........................................12 ......MC91C 5/72 to 10/74
400165..........................................15 ......MC92 11/74 to 4/76
400165...........................................16 .....MC93 4/77 to 7/77

MC-100 ...............................................................................2/66 to 3/66
MC-101 ...............................................................................4/67 to 1/69

400167.............................10, 11..............MC91 M/C 3/73 to 10/74

400170.............................10, 11...............MC101 4/67 to 1/69
400170.............................14 ............ .......MC101A 6/69 to 10/72
400170.............................16 ............ .......MC101AA 2/72 to 10/74
400170.............................17............. .......MC101B 11/74 to 5/77
400170.............................13.....................MC101C 2/69 to 5/69
400170.............................11, 12 ...............MC101D 10/71 to 9/74
400171...................................12 ..............MC101 M/C 4/73 to 6/75
Dave L.
Reply
#9
McBob's listing for the 1-60 series saws, the crank style config number should all be 1 and not 3. Same crank used in the MC5.

the 1-70 saw should read 87cc or 5.3 cu/in

MC10 should read 87cc or 5.3 cu/in.

MC30 should read 100cc

coil lamination gap is incorrect in this statement, should read .010"-012";
"coil gap .018" and points .018" to start with before timing is set. Make sure your timing light is firing when the timing mark on your flywheel hits the front side of the magnet going from left to right. This will give you a good spark and ensure your timing is not advanced to far. "



download images and print off for the home library.
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