[trykemike]

Thanks Quimrider You are correct. I was referring to the diverter not the air box itself. I tested
this by breathing through the filter when I took it out to clean it. The filter was restrictive with the elbow on it si I drilled the 1/2 hole in the elbow to reduce the restriction.It worked. I have not re-jetted the carb because my testing proved that response has now improved noticeably. I had an objective which has been acheived now. Easy is correct that these bikes are lean. The same engine on a gn250 used a 34mm carb and 130 main jet with similiar performance stats but my bike could never exceed 120 kph until mods were done. These mods are however very minimal and conservative. A mechanic advised only uping to 122.5 main jet. ( 2% richer ) I can get that with the enricher circuit on very slightly and can vary according to weather ( humidity and cold ).