My son has a Jaguar 125 and the pipe was super loud . I got another pipe off of a jetmoto and put it on . It runs great on low end but stumbles on the top side. Im thinking because the pipe is more restictive i need to lean it out . Make sense?

 

Welcome to the forum retics4me !

That makes sense to me.. did you get the stock 125 pipe(chrome and heavy) or the stainless steel one?