Drifts left

Single sided swingarm might make it heavier on left side, pull that way. All the rockets have driveshaft on left side, think this could cause it to pull that way. It is easily corrected however, just keep both hands on the handlebars.
Always wondered why Rocket owners never wave at me.
 
Never thought of it but had to try, and sure enough it drifts slowly to the left. I wonder if a bike where the crank rotates clockwise pull to the right (transverse engined, like Moto Guzzi)