lastweek i bought a 03 kx85 powerband was working fine bike had been lieing up for 6 months only drove it for a few mins nd it was hiting powerband fine true all gears put the bike in me shed got few parts needed new shifter,plug,airfilter,engine oil,etc put parts on lastnight went to bring it out tismorning and bike would only hit powerband in 4th and 5th can any1 help me