Mr Gumby
XS650 Member
During the latest shakedown run, I discovered a bit of an issue. Idles great and hums along nicely while cruising but any more than 1/3 throttle and it just falls on its face. I bought the carbs used but "gone through". I had an old Datsun with SU carbs that have a similar design that did that before I had proper filters. I've been using some extra K&Ns I hade laying around from my VMax and have UNIs on order. Does it sound like a carb internal issue or or other wizardry at work? I'd imagine that it's stock jetting inside them. Should I be upping he jet sizes with the open filters and Emgo shorties? I've read it both ways.