I have a little problem with my clutch,as I release the lever the clutch only engages at the very end of the travel and when it does the bike shudders,I have checked everything to do with the clutch with no luck.The bike is a 99rm250 and the friction plates are 3mm thick, the drive plates are like new, the inner and outer basket fingers are smooth,the outer basket **** and needle rollers are fine as well.Any help would be appreciated.