Steve/ian, firstly these ARE our settings in JUNIOR rotax and in Minimax our jetting was circa 135-138. As steve correctly says, testing is the best way but as most who know us in Junior will confirm that my driver runs smaller jets than most and has the ability 2 work the throttle with ease. I know at least 6 other frontrunning Junior drivers who use 150 as std ! Inc the CURRENT mbkc champ ! So please dnt think i am trying 2 mislead you, i always offer people the facility of coming 2 my awning and checking my set up, i am more than happy 2 help the kid ! Last MBKC we were on a 12-70 gearing, 148 jet, k98 clip 2, IW24 plug, 12.5 carb @ 30/30 @ 5.2. We had a fastest lap, put it on pole and a light 2 flag win by over 3 seconds, it works 4 us. Regards. Chris
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