i have photos, of when they where brand new with reciept and my kms on my car plus 3 other people on the forums that helped me tuned and install, i have no need to explain myself to you but your probably just other person who low balls people
kx250f 07 full forged motor all new suspension nearly every after market mod has been done! need to sell used in 2 times in the last year then last time i stuffed my knee, started every 3 weeks, 4200 firm come with spare motor ect( hasnt been raced)
sounds like intercooler piping nick maybe a small split on the elbow, had the same thing thought it was fuel pump because i only got it when in higher revs not on idle