Yamaha YFM90RA Model Vehicle User Manual


 
5 - 5
CARB
CARBURETOR
4. Check:
5. Check:
6
. Check:
8
. Check:
piston valve
Damage/scratches/wear
Replace.
piston valve diaphragm
Cracks/tears
Replace.
vacuum chamber cover
piston valve spring
Cracks/damage
Replace.
jet needle
main jet
Needle jet holder
pilot jet
Bends/damage/wear
Replace.
Obstruction
Clean.
Blow out the jets with compressed air.
piston valve movement
Insert the piston valve into the carburetor
body and move it up and down.
Tightness
Replace the piston valve.
Needle jet
7
. Check:
fuel hoses
Cracks/damage/wear
Replace.
Obstruction
Clean.
Blow out the hoses with compressed air.