kazuma cheetah 125cc misfire jetting

hi guys ive got a 2003 kazuma cheetah 4 stroke and i have a problem with misfire and high end revs starts to judder.

idles fine just judders for power at high end

i took my spark plug out and was a dry sooty black now i think im right in saying tht my fuel to air mixture is to rich so i just need to know once i find out my main jet size will i need to go up jet sizes or down jet sizes untill i find a happy state for the bike and my spark plug changes to a pale brown (normal ) colour im also ordering a new spark plug and ht lead ...... does anybody else recommend something for me to do please write back asap cheers adam

also would anybody know my standard main jet size for a kazuma cheetah 125

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