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Carb tuning

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bimmerboy1

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Jun 7, 2026
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Wanted to play smart but ended up being dumb and how I need your help. I have a cars with a yamaha kt100 and I tried to tune the carb and now it's running like crap so I need to retune it. Anyone who can point me in the right direction because whatever I do i can't get it to run right
 
Been a while since I last worked on something like this, but I'll try to explain. First you bring both needles back to "zero" so have them lithgly tight so not too much pressure to start damaging things. From there, the low speed needle gets more than 1 turn, and the high speed needle get half or less. There are tons of variables so you may need almost 2 turns on the low speed needle and less than half on the high speed one. You'll be doing a lot of testing and fine tuning with this untill you get it to the right point and always do it on a warm
 

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