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Bottom line of the coil & flywheel testing:
Points ignition (Mini Mac) uses "IGN" flywheel 91961/94513/94737,217673
Early brown & large white electronic ignition modules on the 300 Series saws use the same "IGN" flywheel as the Mini Mac models
Black SEM electronic ignitions use "CDI" flywheel 219211
Cream (or off white) electronic ignition modules require the use of 222778 flywheel, should be marked "F" but also has a 5 molded in, 222778 is 20 fins compared to 10 fins for the other two.
The differences between the flywheels is the location/timing of the flywheel key.
All of these flywheels have the narrow (1/16") keyway and wide pawls for use with the plastic starter pulleys. I think the different part numbers for the earliest flywheels correspond to the wide steel pawls on the first, then white or black plastic pawls on later versions.
It is now starting to sink in that when McCulloch went to the last versions of the electronic ignition modules they used the same coil & laminations in several applications, but changed the orientation of the laminations for some.
In other instances, the laminations changed as is the case for the ignitions for the 600 and 10 Series saws.
While the chart (see my post 11,915 above) is helpful, it is not entirely accurate...I guess there's no surprise there for anyone that worked with McCulloch saws and documentation before. For the Mini Mac models, it is necessary to use the CDI flywheel with the SEM electronic ignition modules though the chart shows both points and electronic using the same 94737 flywheel, and they show the 100 Series (Mini Mac) and 300 Series using the 223707 (cream) coil but I found it necessary to add some washers as spacers to allow the coil to actually bolt in place on the 300 Series saws.
In several circumstances the exact same coil and laminations were uses with different length spark plug leads, resulting in different part numbers. So far I have found these leads to be very easy to change by simply "unscrewing" one and replacing it with another appropriate length lead wire.
Mark
Points ignition (Mini Mac) uses "IGN" flywheel 91961/94513/94737,217673
Early brown & large white electronic ignition modules on the 300 Series saws use the same "IGN" flywheel as the Mini Mac models
Black SEM electronic ignitions use "CDI" flywheel 219211
Cream (or off white) electronic ignition modules require the use of 222778 flywheel, should be marked "F" but also has a 5 molded in, 222778 is 20 fins compared to 10 fins for the other two.
The differences between the flywheels is the location/timing of the flywheel key.
All of these flywheels have the narrow (1/16") keyway and wide pawls for use with the plastic starter pulleys. I think the different part numbers for the earliest flywheels correspond to the wide steel pawls on the first, then white or black plastic pawls on later versions.
It is now starting to sink in that when McCulloch went to the last versions of the electronic ignition modules they used the same coil & laminations in several applications, but changed the orientation of the laminations for some.
In other instances, the laminations changed as is the case for the ignitions for the 600 and 10 Series saws.
While the chart (see my post 11,915 above) is helpful, it is not entirely accurate...I guess there's no surprise there for anyone that worked with McCulloch saws and documentation before. For the Mini Mac models, it is necessary to use the CDI flywheel with the SEM electronic ignition modules though the chart shows both points and electronic using the same 94737 flywheel, and they show the 100 Series (Mini Mac) and 300 Series using the 223707 (cream) coil but I found it necessary to add some washers as spacers to allow the coil to actually bolt in place on the 300 Series saws.
In several circumstances the exact same coil and laminations were uses with different length spark plug leads, resulting in different part numbers. So far I have found these leads to be very easy to change by simply "unscrewing" one and replacing it with another appropriate length lead wire.
Mark
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