If you cut/join your factory cam 180* out, you can get 1-4 to fire TOGETHER as well as 2-3. Will give you that POTATO-POTATO-POTATO Harley sound
It will also climb sand hills (with proper tyres) like no ones business.
The Cam I've cut is from a Yamaha xs650 parallel twin, not a sohc /4
Changing it from a 360° to a 277° crank, enabling smoother running.
Most parallel twins made today run with this configuration.
Sorry for any confusion....
Sent from my HTC_M9u using Tapatalk