Anyone have any experiance rejetting their GPZ?
There's not real "standard" to jetting, there's so many variables to consider, that each bikes setup will be slightly different. From the altitude, fuel octane, component wear, and of course your modifications. It sounds like you should start from scratch (idle), and work your way up to wide-open-throttle through all gears, to get your ideal fuelling set for each RPM range. You'll know when you've got it right because the bike will be responsive and crisp across the rev range. Here's the technique I use on my MX bikes:
Install new plug/s, set carb float to OEM specs, and have bike at operating temps at all stages of tuning.
1. Close air screw, then open 1.5 turns.
2. Start engine.
3. Turn idle screw in until slightly fast idle occurs (to stay running).
4. Turn air screw in and out until fastest idle is found. (If screw is less than 1 turn from closed, install larger pilot jet. If 2.5+ turns from closed, install a smaller pilot jet).
5. If pilot screw is changed, tune pilot and air screw again for fastest idle (repeat steps 1-4).
6. Reduce idle with air screw to pre-stalling level and ride bike with closed to ⅛-¼ throttle intervals. Adjust air screw for sharpest response.
7. Mark throttle grip at ¼ and ¾ turns of open. Ride bike in this zone, and I bogging occurs, lower the needle clip 1 position. If pickup is rough, raise needle clip 1 position. Continue adjustments until sharp response occurs.
8. Install fresh plug, and perform full throttle run, through all gears. Once at top speed, engage clutch, kill engine, and coast to stop.
9. Remove plug and inspect insulator closely for condition. White/Grey is Lean, and Brown/Black is Rich. Correct colour is Tan. Adjust main as required to set correct level.
I hope this helps you a little.