THIS PRINT EDITION IS SOLD OUT! 
Print is no longer available, but if you like what you see, and would like to have something similar, drop me a line and if enough people nag at me, I will make a new and improved version! 
Notable issues with the Knucklehead engines built included oil leakage, valve spring breakage, poor rocker lubrication, and leakage of oil from the top end. Oh, and considered by many to be THE coolest motorcycle ever built.  51 x 36 cm.  print size 30 x 40 cm. edition of 15.  signed and numbered.