Try to remove ignition barrel from an rs 125 aprilia (2007 model) one side has a allen key bolt the other side looks like its permanately fixed, how do i undo it?

they are a bit like that anyway mate because of the useless dellorto carb they use but what will make t worse is if the powervalve is either set fully open or if it is stuck open,check if it has a servo/actuator or if it just has a bolted in powervalve blade.the valve is behind the radiator on the top front of the barrel just above the exhaust manifold where it bolts to the barrel.

This means you have a fault code(the bike equivalent of a check engein light)

Aprilia fault codes; From ignition off, press and hold the LAP/PASS switch on the left handlebar. Turn on the ignition but don't start the bike ( keeping LAP/PASS held ). After 30 seconds or so the temp display on the dash will display error code numbers or 0 if none are displayed. Note that the codes are cleared after this operation.
http://img.photobucket.com/albums/v223/DaCat/Aprilia/RSVFaultCodes-1.jpg

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Sounds like it's stuck in a higher gear other than first.

1.take off seat2 undo tank allen bolt on top of tanklift & prop up tankbat is behind water bottle,which is only held in place by 1 bolt on R/H side,3 remove bolt &swing w/b out of the way,4 undo + pos side of bat first then neg side,remove bat from tray ,JOB DONE.,,,