I have a 2000 zr 600 batteryless efi my problem is if i throttle up nice and slow sled goes fine but if i just hammer the throttle it dies unless i let throttle go. also sled wont seem to break 7000 rpm. runs fine at idle and while going. just the throttle issue. to me seams like it needs fuel but not sure. sled seems fine when its cold. this all happens after 20minutes of riding. wondering if its stator. did plugs and tested throttle switch and plug caps replaced. also new fuel lines and filter. . please help!