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I had a friend tell me the other day there is a certan year shovel that is always breaking the motor mounts. Not sure I have ever heard of this, has anybody ever heard of a year motor that does that??
 

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81 shovelhead.Over the years i have had three to four sets of 80-81 shovelheads have the crankpin shot crooked.You could tell that there was something weird when you saw the pattern in the cylinder wear.Looks like a gyroscopic wear pattern on the cylinder bore instead of a straight scuff. Pull the wheels out and put them on a truing stand and they were not that bad,not bad enough to see what i saw in the cyl.
First years of the commonised crank pin.I dont care how well you reballance it,This thing will shake.
 
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