Part number:
LAB0111122140 TAP, PILOT FUEL SCREW WELL. Chasing the threads and lightly greasing the screw will help prevent it from sticking/seizing.
$17.29
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Pilot Fuel Screw Well Tap
Two required per carburetor. Use 08-0557 T-HANDLE BIT DRIVER with number 2 JIS bit (or equivalent) in order to remove the stock screws. Note: The screws are peened on both sides. You can force them out by just continuing to unscrew once they tighten up again on the far side. Because of the peen on the near side, the bit is likely to want to cam out, stripping the head in the process. This can be mitigated by lightly tapping the bit into the slot before attempting to turn, and using sufficient downward pressure (particularly when breaking the screws loose and when forcing past the far side peen). Throttle blade screws not sold separately by Yamaha.