I have a pre evo max junior, has just developed a strange problem, it’s down on power like its holding back then if you push it through to 12k it has this loud metallic howl , i only came on once the kart had done a few laps and when i got home and kart was cool it was revving up nice . Hope someone has had this problem as i don’t know where to start.
Update, the stinger in the exhaust was broken and closed the exhaust.
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How did you find it? By chance or something or someone pointed you that direction?
Was a suspicion I thought air filter first but was ok , then I remembered an old post on karting 1 about needing to change the wool or it will burn the stinger and block exhaust
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