This info may not apply to your model/engine size/year, but...I own a 97 ZX900R Ninja...and put a Hindle slip-on can on her. I didnt do any jetting. Most cases, you'll need to rejet only if you install a full system, not just a slip/bolt-on can. Ninjas tend to run lean from the factory, which produces more engine heat, which shortens engine life over time. So, I also had shims put on my carb needles, (two .5 mm shims per needle) and drilled out the factory-installed plugs over the air/fuel mixture screws so I could richen up the gas/air mixture. As far as your valve damage concerns, talk to several mechanics, and get their insight, or do more research on the web. Visit other forums. Try www.onedownfiveup.com. Hope this helps at least steer you in the right direction....
PS..see if you need a new crush gasket where the canister mates with the header collector (where all 4 pipes merge into one) Chances are you'll have to replace it if it comes with one....
PS..see if you need a new crush gasket where the canister mates with the header collector (where all 4 pipes merge into one) Chances are you'll have to replace it if it comes with one....
