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With the heavier,stiffer crank of the B and the 3/8" larger brgs,you will not need to adjust the brgs near as often as the A crank,especialy with the 33 & later CB crank.Both my A,s have 33 B,s & I like them.One of them is still running the original babbitt.I change the oil every 1,000 miles-no filter.