Originally Posted by Searider
They were always noisy.
Indeed, but on he plus side are thin & light.
Noise I reckon is down to a couple of thigns:
1) no air intake box (I think the later ones might have had one) so the intake noise shoots straight out the carb instead of being diverted-ish backwards. (and there's a big slot for the "go lever" to let it all out at the front)
2) lower cowl (case) is held on with a clip & a single screw, and has vast acres of thin sheet to vibrate.
As I'm going to have to run with mine until I replace the A- frame with a toob diameter following one, I'll let you know how the noise reduction plans go....