fuel screw picture

i have searched unsuccesfully for timing chain adjustment .also where is the fuel screw 03 yz 450 f. thanks in advance

bottom of the carb float bowl

The reason you didn't find anything on timing chain adjustment is because it's completely automatic. There's a link to a replacement write up in common threads, but you never adjust them.

As for the fuel screw, here is what the stocker looks like from underneath:


Here's where it is from the side (red extended screw shown):


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