1998-2004 Honda Foreman 450 factory service manual, Page 108Get this manual
FUELSVSTEM Push the jet needle holder down and turn it counterclockwise 90 degrees with screwdriverThen remove the needle holder, spring, jet needle and washer from the diaphragmVacuum pistonWASHER
Inspect the jet needle for excessive wear at the tip or other damageCheck for torn diaphragm or other deterioration