hi guys I have a 1989 klf300 4x4 it starts and idles immediately but when I rev it it misses terrible,but when I leave it idle for 5/10 mins it revs and the bike goes really well.but as soon as I turn it off for 10/15 minutes it starts immediately and idles but misses like crap again but if left to idle it don't matter how long it still does not rev up.i put new rings,new regulator/rectifier,coil,plug.I have cleaned the carb many times I have got mixture right now I think because the plug is brown,i have reground the valves and set them at 0.15 for inlet and 0.20 for exhaust.i have changed all the jets and set float level at 17mm.checked timing.could someone please help I am getting fed up of it now to put it lightly.thanks p.s forgot to say stator is chucking between 13.5 to 14.4v at battery