Quote:
Originally Posted by Bill Verburg
The irregular firing pulses do have their benefits, among them is the ability to put power to the ground, HD V twins were notoriously good at powering out of a corner on dirt, The Yamaha V4 w/ crossplane crank does the same on pavement, not sure that this is applicable to 8 cylinders though but it sure does sound good.
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One of the older tricks in the H-D flat track arsenal is to re-set the cam timing (very easy on the XR750/Sportster platform) to make it run as a "Twingle". The Triumph, BSA, and Norton guys did this as well on their parallel twins. The parallel twins were turned into a "split single", or "twin single" ("Twingle") wherein both jugs fired together. The H-D's necessarily have a 45 degree split, but the idea is the same. Better traction on really slippery clay. I saw Chris Carr running this setup on his XR750 in Sturgis one year, when he was riding the local half mile while recovering from a broken leg. Very easy to pick his bike out of the crowd.