Originally Posted by
FZRguy
I have cold start problems with my '98 FZR too. I have to use a battery booster to get her to fire first thing in the morning (and she won't fire at all with full choke). She runs and fires perfectly after initial start up. How many miles on your ZX? Def check for good valve clearance, and maybe a leak down compression test. I rebuilt the top-end with new pistons and valves at 36k last year. Just completed another valve adjustment and head re-torque at 39k. A too big pilot jet has been suggested and I'll be looking at carburetion next. Strange tho, I did not have this problem til about 25k miles.