Hey everyone, I'm buying a new cylinder head assembly and have found that the valve buckets/lifters come in three different designated colors I.e, black, yellow and blue. From googleing I did last night I couldn't find any information on them besides the colors have to do with the diameter and or length of the bucket/lifter.My question is, since I'm buying a new cylinder head assembly what bucket color was stock/facotry for this bike? (2002 yamaha YZ426) also, what are the pros/cons of different sized buckets? is it a power tuning thing? or is it somthing like regional assembly where different countries use different colors and only one specific color works for that head?Any insight would be much apprecheated!