I bought a used 426 last Christmas. I noticed a couple of problems like glowing head pipe, lean on deceleration, slight overheating in lower elevations. Well, I was going to go riding at 8000 and took a look at the jet and noticed it had the stock jet (162). I had assumed that the previous owner had rejetted when they installed the the Yoshi pipe... I am now running a 168 and it feels better at 2200ft, but when I open it up it seems to miss at the top end..... I can't find the jetting formula on yoshi's site or anywhere else.... ya know 426 + yoshi = which jet???????? TIA!