hi - some advice please, my 2006 250x with a R cam has ran well for some time. have serviced it and it has new chain and sprockets. at 70 to 80% throttle it runs well through all gears. from 80 to 100% throttle it looses power as if it is starved of fuel. this happens on the flat or on a hill. it especially happens when i open the throttle full in a burn on climbing a hill. any advice on what the problem could be? dirty carb, vales need adjustment? also what are the pros and cons of the "pink wire mod"? thanks in advance for advice....!