That really has nothing to do with the Vape, and all to do with how the crank is set up. The spark will happen when the "hump" on the flywheel triggers the pickup. So it is just a matter of matching the pickup to the cylinder approaching TDC on its compression stroke. In any case, one cylinder will fire, then the crank will turn 277 or 443 degrees before the other fires, all depending.Hopefully someone who has recently installed a 277 VAPE will chime in then. Got to love conflicting information