I have a 1997 MC28 repsol and it has decided over the space of a month or than wont go over 1/4 throttle without dieing. This happens in any gear and any rpm. (it will rev it out fine of i only use 1/4 throttle). It starts very easily and idles smoothly. I have cleaned the carbies, tried different jets, taken the exahust off and cleaned it, changed spark plugs, airfilter and done a general service but nothing has made any difference. This is very frustrating any suggestions?

Everything up to 1/4 throttle is perfect. Also when it dies its like it just cuts out instantly there is very little splutter etc. It is completely de restricted if that makes a difference.

If anyone knows a good mechanic in Melbourne please let me know.