The '
most obvious from a distance' thing that
I notice between the two different machines as they ryde past is the engine noise?!? I generally can't 'see' what they're doing in the way of fuel economy when they ryde on by

and I don't always have the time or opportunity to talk to the owner/ryders in that much detail. :dontknow: Buuut, even with what little of my hearing that's still left functioning, there's a distinctive & noticeable difference in the noise & the '
feel' of the sound the different engine's make.... nojoke
Not sure I can describe it all that well

. but the noise from the 600's sounds &
feels like it's coming from a smallish twin cylinder engine, especially when they are revving away

hyea:
While just like the 1330's, the noise from the 900's sounds &
feels like it's coming from an over-revved sewing machine that's desperately trying to escape the suffocating confines of all the tupperware.... :shocked: . I guess it's more of a 'feeling' about the vibrations on my skin from the sound waves, but the 900's somehow
feel 'rattlier' & more 'frenetic'

even as they do get up and go! :thumbup:
So for whatever that lot's worth.... :cheers: