I acquired a used Yoshimura 4-1 slip-on system and I'm wondering if I have to rejet? If I remember correctly, when these things were available from Dennis Kirk many years ago, I thought it said no jetting is required. I'm running a K&N, all stock other than that. Common sense tells me to rejet if I use it. Input?
Do it ride good or cough, sputter, sneeze, and miss ?? If it does need any futher attention it usually shows up as a flat spot at about 4500-5500 rpm. You'll only know by trying.....
I haven't installed it yet. The carbs were removed, cleaned, rebuilt, synched just 4 months ago. Running good!