Seems my bike makes a big clunk when i shift from 1st to second. Other gears are usually fine, even from neutral to first, but its always 1st to sencond that makes the loudest clunk. Anyone have suggestions as to why this is and how i could lessen it? Nothing really special to mention about the bike, but it is an 03 600RR, runs on full synth, around 8500kms... maybe i just need an oil change? or something more serious? or its just the way they are?