Hi guys I’ve swapped my 2005 290 to a 2010 st300 canastany rep and the 290 was so smooth and smooth bottom end , the 300 is horrible at idle / very low end , I’ve lowered the compression , retarded the ign and slow action throttle which has helped a lot but I feel it could be much better . Has anyone swapped the 28mm flat side dellorto carb for earlier type 26mm ? , strangely it will idle with idle mixture fully in or fully out with very little difference ?? , anyone had any success with this model , ???