So I had a bad leaning out problem on my streetfighter at around 7000rpm. It could free rev to redline but under load would sputter and cut out at 7k. Under the advice of some folks on customfighters, I routed the carb vent tubes into holes I drilled under the air box to equalize pressure. Now she pulls up to 10-11k but still cuts out. I have a mystery brand can, stock air filter and I think stock carbs. It runs great throughout the rpm range. Would simply putting 140 mains on it solve my problem? As in, would upping the jets fix the top end problem while leaving the lower rpm range alone? Thanks in advance for the help

 

 

Thanks, helpful diagram