davey 123

Hi All i have a missfire over 7000 rpm on my tzr-r 125 belgrada, i have noticed that when i open the throttle all the way it missfires but if i open it very slowly as it accelerates it doesnt seem as bad although it still jerks above 8000rpm , it doesnt do it in the first 3 gears. I have no real history on this bike, so if anyone out there knows what the correct standard jet sizes are it would be a good starting point, and or any tips as to carb and air mixture setting . it to me seems its either getting to much fuel and air or not enough. thanks Dave

hi all im a newbie. does anyone out there know how to derestrict a tzr125 (93)belgrada. i live in france and bought it here and its a 4fl model. i also at the moment have a missfire over 8000 rpm in 4, 5 6 th. im have just had a new piston and the bore replated but it had this stutter or missfire before. i was thinking as i dont know the history of this bike that maybe jetting could be a problem ,, what is the standard size i should be looking for . i have read a few threads explaining about the 2 wires that are not connected and need to be earthed ,, does this apply to my bike to derestrict it The sevo when the ignition is turned on does 3 sweeps ,am i correct in asuming that it is resricted . the bike will do about 75 mph on the flat and about 85 down hill. any info on these matters would be much appreciated Dave