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  #1  
Old 09-17-2013, 08:56 PM
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austin8214 austin8214 is offline
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Default Crank shafts
Can someone please refresh my memory to the differences between the k series engine cranks and the magnum engine crank.
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  #2  
Old 09-17-2013, 09:27 PM
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the mag cranks have a 3/8 fine thread bolt holding the flywheel on. They are also nodular iron vs cast
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  #3  
Old 09-17-2013, 09:32 PM
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Thanks Don. The nodular iron makes them much stronger correct.
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  #4  
Old 09-17-2013, 10:31 PM
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the mag cranks have a 3/8 fine thread bolt holding the flywheel on. They are also nodular iron vs cast
Are you sure about that? I took the flywheel bolt out of my k301aqs and its the same as a m12,my drive cup bolted right up using the bolt from the m12 looked on the parts and believe their both 3/8 10-24 ,least on the k301 to m12 engines
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Brian

April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake!
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  #5  
Old 09-22-2013, 07:38 PM
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your AQS was probably short blocked at some point in time.
they are a much better crank
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  #6  
Old 09-22-2013, 11:09 PM
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bocephus1991 bocephus1991 is offline
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I do know that on the magnum cranks the pto end is larger than the k series
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Brian

April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake!
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  #7  
Old 09-23-2013, 05:26 PM
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no, you could get them in 1, 1.5 and tapered for generator use
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  #8  
Old 02-04-2015, 12:18 PM
CubCadet129 CubCadet129 is offline
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Are you sure about that? I took the flywheel bolt out of my k301aqs and its the same as a m12,my drive cup bolted right up using the bolt from the m12 looked on the parts and believe their both 3/8 10-24 ,least on the k301 to m12 engines
Ya my k301 in my 129 has the fine thread 3/8 inch flywheel bolt
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  #9  
Old 02-04-2015, 07:11 PM
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if you have the 3/8 bolt its either a replacement engine or was short blocked
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  #10  
Old 02-05-2015, 08:56 PM
dale c. dale c. is offline
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new cranks have had the bolt and a bushing for in the aluminum cup for about 15 - 20 yrs. now
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