Some time ago I was riding the GPX 250 along the freeway back from geelong, towards melbourne.. My speedo was right on 100 but all these cars were passing me, I thought not everyone could be speeding! When I got to the speed display thing it showed 94 for my 100. I wasnt sure if it was correct or not so I just sped up so i was goin the same as the cars and slowed down for the speed cameras just incase everybody was speeding.. I tested the speed roughly against my mates cbr 600, my speedo seems accurate at lower speeds like 60 and 80. but for a real 100 i need to do about 113 and a real 110 about 120... His speedo matched correctly at 100 on the hume fwy advisory speed check near whittlesea area. Is it possible for it to be out at higher speeds and not at lower speeds? Is the tacho likely to be incorrect as well? it reads about 9000rpm in 6th at my 120 and 8000 at my 110.. Also if anyone knows GPX's well enough, what was your top speed in 5th? My speedo was reading 150 and didnt seem to have much more go left in 5th.. 96mdl Also I dont think the clutch fully engages, when u put it on the centre stand and chuck it into 1st the wheel starts spinning even tho the clutch is in. Simple fix or not? or not a problem?